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Diffstat (limited to 'arch/frv/kernel/gdb-stub.c')
| -rw-r--r-- | arch/frv/kernel/gdb-stub.c | 2084 |
1 files changed, 2084 insertions, 0 deletions
diff --git a/arch/frv/kernel/gdb-stub.c b/arch/frv/kernel/gdb-stub.c new file mode 100644 index 0000000..8f860d9 --- /dev/null +++ b/arch/frv/kernel/gdb-stub.c @@ -0,0 +1,2084 @@ +/* gdb-stub.c: FRV GDB stub + * + * Copyright (C) 2003,4 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * - Derived from Linux/MIPS version, Copyright (C) 1995 Andreas Busse + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +/* + * To enable debugger support, two things need to happen. One, a + * call to set_debug_traps() is necessary in order to allow any breakpoints + * or error conditions to be properly intercepted and reported to gdb. + * Two, a breakpoint needs to be generated to begin communication. This + * is most easily accomplished by a call to breakpoint(). Breakpoint() + * simulates a breakpoint by executing a BREAK instruction. + * + * + * The following gdb commands are supported: + * + * command function Return value + * + * g return the value of the CPU registers hex data or ENN + * G set the value of the CPU registers OK or ENN + * + * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN + * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN + * + * c Resume at current address SNN ( signal NN) + * cAA..AA Continue at address AA..AA SNN + * + * s Step one instruction SNN + * sAA..AA Step one instruction from AA..AA SNN + * + * k kill + * + * ? What was the last sigval ? SNN (signal NN) + * + * bBB..BB Set baud rate to BB..BB OK or BNN, then sets + * baud rate + * + * All commands and responses are sent with a packet which includes a + * checksum. A packet consists of + * + * $<packet info>#<checksum>. + * + * where + * <packet info> :: <characters representing the command or response> + * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> + * + * When a packet is received, it is first acknowledged with either '+' or '-'. + * '+' indicates a successful transfer. '-' indicates a failed transfer. + * + * Example: + * + * Host: Reply: + * $m0,10#2a +$00010203040506070809101112131415#42 + * + * + * ============== + * MORE EXAMPLES: + * ============== + * + * For reference -- the following are the steps that one + * company took (RidgeRun Inc) to get remote gdb debugging + * going. In this scenario the host machine was a PC and the + * target platform was a Galileo EVB64120A MIPS evaluation + * board. + * + * Step 1: + * First download gdb-5.0.tar.gz from the internet. + * and then build/install the package. + * + * Example: + * $ tar zxf gdb-5.0.tar.gz + * $ cd gdb-5.0 + * $ ./configure --target=frv-elf-gdb + * $ make + * $ frv-elf-gdb + * + * Step 2: + * Configure linux for remote debugging and build it. + * + * Example: + * $ cd ~/linux + * $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging> + * $ make dep; make vmlinux + * + * Step 3: + * Download the kernel to the remote target and start + * the kernel running. It will promptly halt and wait + * for the host gdb session to connect. It does this + * since the "Kernel Hacking" option has defined + * CONFIG_REMOTE_DEBUG which in turn enables your calls + * to: + * set_debug_traps(); + * breakpoint(); + * + * Step 4: + * Start the gdb session on the host. + * + * Example: + * $ frv-elf-gdb vmlinux + * (gdb) set remotebaud 115200 + * (gdb) target remote /dev/ttyS1 + * ...at this point you are connected to + * the remote target and can use gdb + * in the normal fasion. Setting + * breakpoints, single stepping, + * printing variables, etc. + * + */ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/nmi.h> + +#include <asm/pgtable.h> +#include <asm/system.h> +#include <asm/gdb-stub.h> + +#define LEDS(x) do { /* *(u32*)0xe1200004 = ~(x); mb(); */ } while(0) + +#undef GDBSTUB_DEBUG_PROTOCOL + +extern void debug_to_serial(const char *p, int n); +extern void gdbstub_console_write(struct console *co, const char *p, unsigned n); + +extern volatile uint32_t __break_error_detect[3]; /* ESFR1, ESR15, EAR15 */ +extern struct user_context __break_user_context; + +struct __debug_amr { + unsigned long L, P; +} __attribute__((aligned(8))); + +struct __debug_mmu { + struct { + unsigned long hsr0, pcsr, esr0, ear0, epcr0; +#ifdef CONFIG_MMU + unsigned long tplr, tppr, tpxr, cxnr; +#endif + } regs; + + struct __debug_amr iamr[16]; + struct __debug_amr damr[16]; + +#ifdef CONFIG_MMU + struct __debug_amr tlb[64*2]; +#endif +}; + +static struct __debug_mmu __debug_mmu; + +/* + * BUFMAX defines the maximum number of characters in inbound/outbound buffers + * at least NUMREGBYTES*2 are needed for register packets + */ +#define BUFMAX 2048 + +#define BREAK_INSN 0x801000c0 /* use "break" as bkpt */ + +static const char gdbstub_banner[] = "Linux/FR-V GDB Stub (c) RedHat 2003\n"; + +volatile u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); +volatile u32 gdbstub_rx_inp = 0; +volatile u32 gdbstub_rx_outp = 0; +volatile u8 gdbstub_rx_overflow = 0; +u8 gdbstub_rx_unget = 0; + +/* set with GDB whilst running to permit step through exceptions */ +extern volatile u32 __attribute__((section(".bss"))) gdbstub_trace_through_exceptions; + +static char input_buffer[BUFMAX]; +static char output_buffer[BUFMAX]; + +static const char hexchars[] = "0123456789abcdef"; + +static const char *regnames[] = { + "PSR ", "ISR ", "CCR ", "CCCR", + "LR ", "LCR ", "PC ", "_stt", + "sys ", "GR8*", "GNE0", "GNE1", + "IACH", "IACL", + "TBR ", "SP ", "FP ", "GR3 ", + "GR4 ", "GR5 ", "GR6 ", "GR7 ", + "GR8 ", "GR9 ", "GR10", "GR11", + "GR12", "GR13", "GR14", "GR15", + "GR16", "GR17", "GR18", "GR19", + "GR20", "GR21", "GR22", "GR23", + "GR24", "GR25", "GR26", "GR27", + "EFRM", "CURR", "GR30", "BFRM" +}; + +struct gdbstub_bkpt { + unsigned long addr; /* address of breakpoint */ + unsigned len; /* size of breakpoint */ + uint32_t originsns[7]; /* original instructions */ +}; + +static struct gdbstub_bkpt gdbstub_bkpts[256]; + +/* + * local prototypes + */ + +static void gdbstub_recv_packet(char *buffer); +static int gdbstub_send_packet(char *buffer); +static int gdbstub_compute_signal(unsigned long tbr); +static int hex(unsigned char ch); +static int hexToInt(char **ptr, unsigned long *intValue); +static unsigned char *mem2hex(const void *mem, char *buf, int count, int may_fault); +static char *hex2mem(const char *buf, void *_mem, int count); + +/* + * Convert ch from a hex digit to an int + */ +static int hex(unsigned char ch) +{ + if (ch >= 'a' && ch <= 'f') + return ch-'a'+10; + if (ch >= '0' && ch <= '9') + return ch-'0'; + if (ch >= 'A' && ch <= 'F') + return ch-'A'+10; + return -1; +} + +void gdbstub_printk(const char *fmt, ...) +{ + static char buf[1024]; + va_list args; + int len; + + /* Emit the output into the temporary buffer */ + va_start(args, fmt); + len = vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + debug_to_serial(buf, len); +} + +static inline char *gdbstub_strcpy(char *dst, const char *src) +{ + int loop = 0; + while ((dst[loop] = src[loop])) + loop++; + return dst; +} + +static void gdbstub_purge_cache(void) +{ + asm volatile(" dcef @(gr0,gr0),#1 \n" + " icei @(gr0,gr0),#1 \n" + " membar \n" + " bar \n" + ); +} + +/*****************************************************************************/ +/* + * scan for the sequence $<data>#<checksum> + */ +static void gdbstub_recv_packet(char *buffer) +{ + unsigned char checksum; + unsigned char xmitcsum; + unsigned char ch; + int count, i, ret, error; + + for (;;) { + /* wait around for the start character, ignore all other characters */ + do { + gdbstub_rx_char(&ch, 0); + } while (ch != '$'); + + checksum = 0; + xmitcsum = -1; + count = 0; + error = 0; + + /* now, read until a # or end of buffer is found */ + while (count < BUFMAX) { + ret = gdbstub_rx_char(&ch, 0); + if (ret < 0) + error = ret; + + if (ch == '#') + break; + checksum += ch; + buffer[count] = ch; + count++; + } + + if (error == -EIO) { + gdbstub_proto("### GDB Rx Error - Skipping packet ###\n"); + gdbstub_proto("### GDB Tx NAK\n"); + gdbstub_tx_char('-'); + continue; + } + + if (count >= BUFMAX || error) + continue; + + buffer[count] = 0; + + /* read the checksum */ + ret = gdbstub_rx_char(&ch, 0); + if (ret < 0) + error = ret; + xmitcsum = hex(ch) << 4; + + ret = gdbstub_rx_char(&ch, 0); + if (ret < 0) + error = ret; + xmitcsum |= hex(ch); + + if (error) { + if (error == -EIO) + gdbstub_proto("### GDB Rx Error - Skipping packet\n"); + gdbstub_proto("### GDB Tx NAK\n"); + gdbstub_tx_char('-'); + continue; + } + + /* check the checksum */ + if (checksum != xmitcsum) { + gdbstub_proto("### GDB Tx NAK\n"); + gdbstub_tx_char('-'); /* failed checksum */ + continue; + } + + gdbstub_proto("### GDB Rx '$%s#%02x' ###\n", buffer, checksum); + gdbstub_proto("### GDB Tx ACK\n"); + gdbstub_tx_char('+'); /* successful transfer */ + + /* if a sequence char is present, reply the sequence ID */ + if (buffer[2] == ':') { + gdbstub_tx_char(buffer[0]); + gdbstub_tx_char(buffer[1]); + + /* remove sequence chars from buffer */ + count = 0; + while (buffer[count]) count++; + for (i=3; i <= count; i++) + buffer[i - 3] = buffer[i]; + } + + break; + } +} /* end gdbstub_recv_packet() */ + +/*****************************************************************************/ +/* + * send the packet in buffer. + * - return 0 if successfully ACK'd + * - return 1 if abandoned due to new incoming packet + */ +static int gdbstub_send_packet(char *buffer) +{ + unsigned char checksum; + int count; + unsigned char ch; + + /* $<packet info>#<checksum> */ + gdbstub_proto("### GDB Tx '%s' ###\n", buffer); + + do { + gdbstub_tx_char('$'); + checksum = 0; + count = 0; + + while ((ch = buffer[count]) != 0) { + gdbstub_tx_char(ch); + checksum += ch; + count += 1; + } + + gdbstub_tx_char('#'); + gdbstub_tx_char(hexchars[checksum >> 4]); + gdbstub_tx_char(hexchars[checksum & 0xf]); + + } while (gdbstub_rx_char(&ch,0), +#ifdef GDBSTUB_DEBUG_PROTOCOL + ch=='-' && (gdbstub_proto("### GDB Rx NAK\n"),0), + ch!='-' && ch!='+' && (gdbstub_proto("### GDB Rx ??? %02x\n",ch),0), +#endif + ch!='+' && ch!='$'); + + if (ch=='+') { + gdbstub_proto("### GDB Rx ACK\n"); + return 0; + } + + gdbstub_proto("### GDB Tx Abandoned\n"); + gdbstub_rx_unget = ch; + return 1; +} /* end gdbstub_send_packet() */ + +/* + * While we find nice hex chars, build an int. + * Return number of chars processed. + */ +static int hexToInt(char **ptr, unsigned long *_value) +{ + int count = 0, ch; + + *_value = 0; + while (**ptr) { + ch = hex(**ptr); + if (ch < 0) + break; + + *_value = (*_value << 4) | ((uint8_t) ch & 0xf); + count++; + + (*ptr)++; + } + + return count; +} + +/*****************************************************************************/ +/* + * probe an address to see whether it maps to anything + */ +static inline int gdbstub_addr_probe(const void *vaddr) +{ +#ifdef CONFIG_MMU + unsigned long paddr; + + asm("lrad %1,%0,#1,#0,#0" : "=r"(paddr) : "r"(vaddr)); + if (!(paddr & xAMPRx_V)) + return 0; +#endif + + return 1; +} /* end gdbstub_addr_probe() */ + +#ifdef CONFIG_MMU +static unsigned long __saved_dampr, __saved_damlr; + +static inline unsigned long gdbstub_virt_to_pte(unsigned long vaddr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + unsigned long val, dampr5; + + pgd = (pgd_t *) __get_DAMLR(3) + pgd_index(vaddr); + pud = pud_offset(pgd, vaddr); + pmd = pmd_offset(pud, vaddr); + + if (pmd_bad(*pmd) || !pmd_present(*pmd)) + return 0; + + /* make sure dampr5 maps to the correct pmd */ + dampr5 = __get_DAMPR(5); + val = pmd_val(*pmd); + __set_DAMPR(5, val | xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C | xAMPRx_V); + + /* now its safe to access pmd */ + pte = (pte_t *)__get_DAMLR(5) + __pte_index(vaddr); + if (pte_present(*pte)) + val = pte_val(*pte); + else + val = 0; + + /* restore original dampr5 */ + __set_DAMPR(5, dampr5); + + return val; +} +#endif + +static inline int gdbstub_addr_map(const void *vaddr) +{ +#ifdef CONFIG_MMU + unsigned long pte; + + __saved_dampr = __get_DAMPR(2); + __saved_damlr = __get_DAMLR(2); +#endif + if (gdbstub_addr_probe(vaddr)) + return 1; +#ifdef CONFIG_MMU + pte = gdbstub_virt_to_pte((unsigned long) vaddr); + if (pte) { + __set_DAMPR(2, pte); + __set_DAMLR(2, (unsigned long) vaddr & PAGE_MASK); + return 1; + } +#endif + return 0; +} + +static inline void gdbstub_addr_unmap(void) +{ +#ifdef CONFIG_MMU + __set_DAMPR(2, __saved_dampr); + __set_DAMLR(2, __saved_damlr); +#endif +} + +/* + * access potentially dodgy memory through a potentially dodgy pointer + */ +static inline int gdbstub_read_dword(const void *addr, uint32_t *_res) +{ + unsigned long brr; + uint32_t res; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " ld%I2 %M2,%0 \n" + " movsg brr,%1 \n" + : "=r"(res), "=r"(brr) + : "m"(*(uint32_t *) addr)); + *_res = res; + gdbstub_addr_unmap(); + return likely(!brr); +} + +static inline int gdbstub_write_dword(void *addr, uint32_t val) +{ + unsigned long brr; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " st%I2 %1,%M2 \n" + " movsg brr,%0 \n" + : "=r"(brr) + : "r"(val), "m"(*(uint32_t *) addr)); + gdbstub_addr_unmap(); + return likely(!brr); +} + +static inline int gdbstub_read_word(const void *addr, uint16_t *_res) +{ + unsigned long brr; + uint16_t res; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " lduh%I2 %M2,%0 \n" + " movsg brr,%1 \n" + : "=r"(res), "=r"(brr) + : "m"(*(uint16_t *) addr)); + *_res = res; + gdbstub_addr_unmap(); + return likely(!brr); +} + +static inline int gdbstub_write_word(void *addr, uint16_t val) +{ + unsigned long brr; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " sth%I2 %1,%M2 \n" + " movsg brr,%0 \n" + : "=r"(brr) + : "r"(val), "m"(*(uint16_t *) addr)); + gdbstub_addr_unmap(); + return likely(!brr); +} + +static inline int gdbstub_read_byte(const void *addr, uint8_t *_res) +{ + unsigned long brr; + uint8_t res; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " ldub%I2 %M2,%0 \n" + " movsg brr,%1 \n" + : "=r"(res), "=r"(brr) + : "m"(*(uint8_t *) addr)); + *_res = res; + gdbstub_addr_unmap(); + return likely(!brr); +} + +static inline int gdbstub_write_byte(void *addr, uint8_t val) +{ + unsigned long brr; + + if (!gdbstub_addr_map(addr)) + return 0; + + asm volatile(" movgs gr0,brr \n" + " stb%I2 %1,%M2 \n" + " movsg brr,%0 \n" + : "=r"(brr) + : "r"(val), "m"(*(uint8_t *) addr)); + gdbstub_addr_unmap(); + return likely(!brr); +} + +static void __gdbstub_console_write(struct console *co, const char *p, unsigned n) +{ + char outbuf[26]; + int qty; + + outbuf[0] = 'O'; + + while (n > 0) { + qty = 1; + + while (n > 0 && qty < 20) { + mem2hex(p, outbuf + qty, 2, 0); + qty += 2; + if (*p == 0x0a) { + outbuf[qty++] = '0'; + outbuf[qty++] = 'd'; + } + p++; + n--; + } + + outbuf[qty] = 0; + gdbstub_send_packet(outbuf); + } +} + +#if 0 +void debug_to_serial(const char *p, int n) +{ + gdbstub_console_write(NULL,p,n); +} +#endif + +#ifdef CONFIG_GDBSTUB_CONSOLE + +static kdev_t gdbstub_console_dev(struct console *con) +{ + return MKDEV(1,3); /* /dev/null */ +} + +static struct console gdbstub_console = { + .name = "gdb", + .write = gdbstub_console_write, /* in break.S */ + .device = gdbstub_console_dev, + .flags = CON_PRINTBUFFER, + .index = -1, +}; + +#endif + +/*****************************************************************************/ +/* + * Convert the memory pointed to by mem into hex, placing result in buf. + * - if successful, return a pointer to the last char put in buf (NUL) + * - in case of mem fault, return NULL + * may_fault is non-zero if we are reading from arbitrary memory, but is currently + * not used. + */ +static unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault) +{ + const uint8_t *mem = _mem; + uint8_t ch[4] __attribute__((aligned(4))); + + if ((uint32_t)mem&1 && count>=1) { + if (!gdbstub_read_byte(mem,ch)) + return NULL; + *buf++ = hexchars[ch[0] >> 4]; + *buf++ = hexchars[ch[0] & 0xf]; + mem++; + count--; + } + + if ((uint32_t)mem&3 && count>=2) { + if (!gdbstub_read_word(mem,(uint16_t *)ch)) + return NULL; + *buf++ = hexchars[ch[0] >> 4]; + *buf++ = hexchars[ch[0] & 0xf]; + *buf++ = hexchars[ch[1] >> 4]; + *buf++ = hexchars[ch[1] & 0xf]; + mem += 2; + count -= 2; + } + + while (count>=4) { + if (!gdbstub_read_dword(mem,(uint32_t *)ch)) + return NULL; + *buf++ = hexchars[ch[0] >> 4]; + *buf++ = hexchars[ch[0] & 0xf]; + *buf++ = hexchars[ch[1] >> 4]; + *buf++ = hexchars[ch[1] & 0xf]; + *buf++ = hexchars[ch[2] >> 4]; + *buf++ = hexchars[ch[2] & 0xf]; + *buf++ = hexchars[ch[3] >> 4]; + *buf++ = hexchars[ch[3] & 0xf]; + mem += 4; + count -= 4; + } + + if (count>=2) { + if (!gdbstub_read_word(mem,(uint16_t *)ch)) + return NULL; + *buf++ = hexchars[ch[0] >> 4]; + *buf++ = hexchars[ch[0] & 0xf]; + *buf++ = hexchars[ch[1] >> 4]; + *buf++ = hexchars[ch[1] & 0xf]; + mem += 2; + count -= 2; + } + + if (count>=1) { + if (!gdbstub_read_byte(mem,ch)) + return NULL; + *buf++ = hexchars[ch[0] >> 4]; + *buf++ = hexchars[ch[0] & 0xf]; + } + + *buf = 0; + + return buf; +} /* end mem2hex() */ + +/*****************************************************************************/ +/* + * convert the hex array pointed to by buf into binary to be placed in mem + * return a pointer to the character AFTER the last byte of buffer consumed + */ +static char *hex2mem(const char *buf, void *_mem, int count) +{ + uint8_t *mem = _mem; + union { + uint32_t l; + uint16_t w; + uint8_t b[4]; + } ch; + + if ((u32)mem&1 && count>=1) { + ch.b[0] = hex(*buf++) << 4; + ch.b[0] |= hex(*buf++); + if (!gdbstub_write_byte(mem,ch.b[0])) + return NULL; + mem++; + count--; + } + + if ((u32)mem&3 && count>=2) { + ch.b[0] = hex(*buf++) << 4; + ch.b[0] |= hex(*buf++); + ch.b[1] = hex(*buf++) << 4; + ch.b[1] |= hex(*buf++); + if (!gdbstub_write_word(mem,ch.w)) + return NULL; + mem += 2; + count -= 2; + } + + while (count>=4) { + ch.b[0] = hex(*buf++) << 4; + ch.b[0] |= hex(*buf++); + ch.b[1] = hex(*buf++) << 4; + ch.b[1] |= hex(*buf++); + ch.b[2] = hex(*buf++) << 4; + ch.b[2] |= hex(*buf++); + ch.b[3] = hex(*buf++) << 4; + ch.b[3] |= hex(*buf++); + if (!gdbstub_write_dword(mem,ch.l)) + return NULL; + mem += 4; + count -= 4; + } + + if (count>=2) { + ch.b[0] = hex(*buf++) << 4; + ch.b[0] |= hex(*buf++); + ch.b[1] = hex(*buf++) << 4; + ch.b[1] |= hex(*buf++); + if (!gdbstub_write_word(mem,ch.w)) + return NULL; + mem += 2; + count -= 2; + } + + if (count>=1) { + ch.b[0] = hex(*buf++) << 4; + ch.b[0] |= hex(*buf++); + if (!gdbstub_write_byte(mem,ch.b[0])) + return NULL; + } + + return (char *) buf; +} /* end hex2mem() */ + +/*****************************************************************************/ +/* + * This table contains the mapping between FRV TBR.TT exception codes, + * and signals, which are primarily what GDB understands. It also + * indicates which hardware traps we need to commandeer when + * initializing the stub. + */ +static const struct brr_to_sig_map { + unsigned long brr_mask; /* BRR bitmask */ + unsigned long tbr_tt; /* TBR.TT code (in BRR.EBTT) */ + unsigned int signo; /* Signal that we map this into */ +} brr_to_sig_map[] = { + { BRR_EB, TBR_TT_INSTR_ACC_ERROR, SIGSEGV }, + { BRR_EB, TBR_TT_ILLEGAL_INSTR, SIGILL }, + { BRR_EB, TBR_TT_PRIV_INSTR, SIGILL }, + { BRR_EB, TBR_TT_MP_EXCEPTION, SIGFPE }, + { BRR_EB, TBR_TT_DATA_ACC_ERROR, SIGSEGV }, + { BRR_EB, TBR_TT_DATA_STR_ERROR, SIGSEGV }, + { BRR_EB, TBR_TT_DIVISION_EXCEP, SIGFPE }, + { BRR_EB, TBR_TT_COMPOUND_EXCEP, SIGSEGV }, + { BRR_EB, TBR_TT_INTERRUPT_13, SIGALRM }, /* watchdog */ + { BRR_EB, TBR_TT_INTERRUPT_14, SIGINT }, /* GDB serial */ + { BRR_EB, TBR_TT_INTERRUPT_15, SIGQUIT }, /* NMI */ + { BRR_CB, 0, SIGUSR1 }, + { BRR_TB, 0, SIGUSR2 }, + { BRR_DBNEx, 0, SIGTRAP }, + { BRR_DBx, 0, SIGTRAP }, /* h/w watchpoint */ + { BRR_IBx, 0, SIGTRAP }, /* h/w breakpoint */ + { BRR_CBB, 0, SIGTRAP }, + { BRR_SB, 0, SIGTRAP }, + { BRR_ST, 0, SIGTRAP }, /* single step */ + { 0, 0, SIGHUP } /* default */ +}; + +/*****************************************************************************/ +/* + * convert the FRV BRR register contents into a UNIX signal number + */ +static inline int gdbstub_compute_signal(unsigned long brr) +{ + const struct brr_to_sig_map *map; + unsigned long tbr = (brr & BRR_EBTT) >> 12; + + for (map = brr_to_sig_map; map->brr_mask; map++) + if (map->brr_mask & brr) + if (!map->tbr_tt || map->tbr_tt == tbr) + break; + + return map->signo; +} /* end gdbstub_compute_signal() */ + +/*****************************************************************************/ +/* + * set a software breakpoint or a hardware breakpoint or watchpoint + */ +static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsigned long len) +{ + unsigned long tmp; + int bkpt, loop, xloop; + + union { + struct { + unsigned long mask0, mask1; + }; + uint8_t bytes[8]; + } dbmr; + + //gdbstub_printk("setbkpt(%ld,%08lx,%ld)\n", type, addr, len); + + switch (type) { + /* set software breakpoint */ + case 0: + if (addr & 3 || len > 7*4) + return -EINVAL; + + for (bkpt = 255; bkpt >= 0; bkpt--) + if (!gdbstub_bkpts[bkpt].addr) + break; + if (bkpt < 0) + return -ENOSPC; + + for (loop = 0; loop < len/4; loop++) + if (!gdbstub_read_dword(&((uint32_t *) addr)[loop], + &gdbstub_bkpts[bkpt].originsns[loop])) + return -EFAULT; + + for (loop = 0; loop < len/4; loop++) + if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], + BREAK_INSN) + ) { + /* need to undo the changes if possible */ + for (xloop = 0; xloop < loop; xloop++) + gdbstub_write_dword(&((uint32_t *) addr)[xloop], + gdbstub_bkpts[bkpt].originsns[xloop]); + return -EFAULT; + } + + gdbstub_bkpts[bkpt].addr = addr; + gdbstub_bkpts[bkpt].len = len; + +#if 0 + gdbstub_printk("Set BKPT[%02x]: %08lx #%d {%04x, %04x} -> { %04x, %04x }\n", + bkpt, + gdbstub_bkpts[bkpt].addr, + gdbstub_bkpts[bkpt].len, + gdbstub_bkpts[bkpt].originsns[0], + gdbstub_bkpts[bkpt].originsns[1], + ((uint32_t *) addr)[0], + ((uint32_t *) addr)[1] + ); +#endif + return 0; + + /* set hardware breakpoint */ + case 1: + if (addr & 3 || len != 4) + return -EINVAL; + + if (!(__debug_regs->dcr & DCR_IBE0)) { + //gdbstub_printk("set h/w break 0: %08lx\n", addr); + __debug_regs->dcr |= DCR_IBE0; + asm volatile("movgs %0,ibar0" : : "r"(addr)); + return 0; + } + + if (!(__debug_regs->dcr & DCR_IBE1)) { + //gdbstub_printk("set h/w break 1: %08lx\n", addr); + __debug_regs->dcr |= DCR_IBE1; + asm volatile("movgs %0,ibar1" : : "r"(addr)); + return 0; + } + + if (!(__debug_regs->dcr & DCR_IBE2)) { + //gdbstub_printk("set h/w break 2: %08lx\n", addr); + __debug_regs->dcr |= DCR_IBE2; + asm volatile("movgs %0,ibar2" : : "r"(addr)); + return 0; + } + + if (!(__debug_regs->dcr & DCR_IBE3)) { + //gdbstub_printk("set h/w break 3: %08lx\n", addr); + __debug_regs->dcr |= DCR_IBE3; + asm volatile("movgs %0,ibar3" : : "r"(addr)); + return 0; + } + + return -ENOSPC; + + /* set data read/write/access watchpoint */ + case 2: + case 3: + case 4: + if ((addr & ~7) != ((addr + len - 1) & ~7)) + return -EINVAL; + + tmp = addr & 7; + + memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); + for (loop = 0; loop < len; loop++) + dbmr.bytes[tmp + loop] = 0; + + addr &= ~7; + + if (!(__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0))) { + //gdbstub_printk("set h/w watchpoint 0 type %ld: %08lx\n", type, addr); + tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; + __debug_regs->dcr |= tmp; + asm volatile(" movgs %0,dbar0 \n" + " movgs %1,dbmr00 \n" + " movgs %2,dbmr01 \n" + " movgs gr0,dbdr00 \n" + " movgs gr0,dbdr01 \n" + : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); + return 0; + } + + if (!(__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1))) { + //gdbstub_printk("set h/w watchpoint 1 type %ld: %08lx\n", type, addr); + tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; + __debug_regs->dcr |= tmp; + asm volatile(" movgs %0,dbar1 \n" + " movgs %1,dbmr10 \n" + " movgs %2,dbmr11 \n" + " movgs gr0,dbdr10 \n" + " movgs gr0,dbdr11 \n" + : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); + return 0; + } + + return -ENOSPC; + + default: + return -EINVAL; + } + +} /* end gdbstub_set_breakpoint() */ + +/*****************************************************************************/ +/* + * clear a breakpoint or watchpoint + */ +int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned long len) +{ + unsigned long tmp; + int bkpt, loop; + + union { + struct { + unsigned long mask0, mask1; + }; + uint8_t bytes[8]; + } dbmr; + + //gdbstub_printk("clearbkpt(%ld,%08lx,%ld)\n", type, addr, len); + + switch (type) { + /* clear software breakpoint */ + case 0: + for (bkpt = 255; bkpt >= 0; bkpt--) + if (gdbstub_bkpts[bkpt].addr == addr && gdbstub_bkpts[bkpt].len == len) + break; + if (bkpt < 0) + return -ENOENT; + + gdbstub_bkpts[bkpt].addr = 0; + + for (loop = 0; loop < len/4; loop++) + if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], + gdbstub_bkpts[bkpt].originsns[loop])) + return -EFAULT; + return 0; + + /* clear hardware breakpoint */ + case 1: + if (addr & 3 || len != 4) + return -EINVAL; + +#define __get_ibar(X) ({ unsigned long x; asm volatile("movsg ibar"#X",%0" : "=r"(x)); x; }) + + if (__debug_regs->dcr & DCR_IBE0 && __get_ibar(0) == addr) { + //gdbstub_printk("clear h/w break 0: %08lx\n", addr); + __debug_regs->dcr &= ~DCR_IBE0; + asm volatile("movgs gr0,ibar0"); + return 0; + } + + if (__debug_regs->dcr & DCR_IBE1 && __get_ibar(1) == addr) { + //gdbstub_printk("clear h/w break 1: %08lx\n", addr); + __debug_regs->dcr &= ~DCR_IBE1; + asm volatile("movgs gr0,ibar1"); + return 0; + } + + if (__debug_regs->dcr & DCR_IBE2 && __get_ibar(2) == addr) { + //gdbstub_printk("clear h/w break 2: %08lx\n", addr); + __debug_regs->dcr &= ~DCR_IBE2; + asm volatile("movgs gr0,ibar2"); + return 0; + } + + if (__debug_regs->dcr & DCR_IBE3 && __get_ibar(3) == addr) { + //gdbstub_printk("clear h/w break 3: %08lx\n", addr); + __debug_regs->dcr &= ~DCR_IBE3; + asm volatile("movgs gr0,ibar3"); + return 0; + } + + return -EINVAL; + + /* clear data read/write/access watchpoint */ + case 2: + case 3: + case 4: + if ((addr & ~7) != ((addr + len - 1) & ~7)) + return -EINVAL; + + tmp = addr & 7; + + memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); + for (loop = 0; loop < len; loop++) + dbmr.bytes[tmp + loop] = 0; + + addr &= ~7; + +#define __get_dbar(X) ({ unsigned long x; asm volatile("movsg dbar"#X",%0" : "=r"(x)); x; }) +#define __get_dbmr0(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"0,%0" : "=r"(x)); x; }) +#define __get_dbmr1(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"1,%0" : "=r"(x)); x; }) + + /* consider DBAR 0 */ + tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; + + if ((__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0)) != tmp || + __get_dbar(0) != addr || + __get_dbmr0(0) != dbmr.mask0 || + __get_dbmr1(0) != dbmr.mask1) + goto skip_dbar0; + + //gdbstub_printk("clear h/w watchpoint 0 type %ld: %08lx\n", type, addr); + __debug_regs->dcr &= ~(DCR_DRBE0|DCR_DWBE0); + asm volatile(" movgs gr0,dbar0 \n" + " movgs gr0,dbmr00 \n" + " movgs gr0,dbmr01 \n" + " movgs gr0,dbdr00 \n" + " movgs gr0,dbdr01 \n"); + return 0; + + skip_dbar0: + /* consider DBAR 0 */ + tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; + + if ((__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1)) != tmp || + __get_dbar(1) != addr || + __get_dbmr0(1) != dbmr.mask0 || + __get_dbmr1(1) != dbmr.mask1) + goto skip_dbar1; + + //gdbstub_printk("clear h/w watchpoint 1 type %ld: %08lx\n", type, addr); + __debug_regs->dcr &= ~(DCR_DRBE1|DCR_DWBE1); + asm volatile(" movgs gr0,dbar1 \n" + " movgs gr0,dbmr10 \n" + " movgs gr0,dbmr11 \n" + " movgs gr0,dbdr10 \n" + " movgs gr0,dbdr11 \n"); + return 0; + + skip_dbar1: + return -ENOSPC; + + default: + return -EINVAL; + } +} /* end gdbstub_clear_breakpoint() */ + +/*****************************************************************************/ +/* + * check a for an internal software breakpoint, and wind the PC back if necessary + */ +static void gdbstub_check_breakpoint(void) +{ + unsigned long addr = __debug_frame->pc - 4; + int bkpt; + + for (bkpt = 255; bkpt >= 0; bkpt--) + if (gdbstub_bkpts[bkpt].addr == addr) + break; + if (bkpt >= 0) + __debug_frame->pc = addr; + + //gdbstub_printk("alter pc [%d] %08lx\n", bkpt, __debug_frame->pc); + +} /* end gdbstub_check_breakpoint() */ + +/*****************************************************************************/ +/* + * + */ +static void __attribute__((unused)) gdbstub_show_regs(void) +{ + uint32_t *reg; + int loop; + + gdbstub_printk("\n"); + + gdbstub_printk("Frame: @%p [%s]\n", + __debug_frame, + __debug_frame->psr & PSR_S ? "kernel" : "user"); + + reg = (uint32_t *) __debug_frame; + for (loop = 0; loop < REG__END; loop++) { + printk("%s %08x", regnames[loop + 0], reg[loop + 0]); + + if (loop == REG__END - 1 || loop % 5 == 4) + printk("\n"); + else + printk(" | "); + } + + gdbstub_printk("Process %s (pid: %d)\n", current->comm, current->pid); +} /* end gdbstub_show_regs() */ + +/*****************************************************************************/ +/* + * dump debugging regs + */ +static void __attribute__((unused)) gdbstub_dump_debugregs(void) +{ + unsigned long x; + + x = __debug_regs->dcr; + gdbstub_printk("DCR %08lx ", x); + + x = __debug_regs->brr; + gdbstub_printk("BRR %08lx\n", x); + + gdbstub_printk("IBAR0 %08lx ", __get_ibar(0)); + gdbstub_printk("IBAR1 %08lx ", __get_ibar(1)); + gdbstub_printk("IBAR2 %08lx ", __get_ibar(2)); + gdbstub_printk("IBAR3 %08lx\n", __get_ibar(3)); + + gdbstub_printk("DBAR0 %08lx ", __get_dbar(0)); + gdbstub_printk("DBMR00 %08lx ", __get_dbmr0(0)); + gdbstub_printk("DBMR01 %08lx\n", __get_dbmr1(0)); + + gdbstub_printk("DBAR1 %08lx ", __get_dbar(1)); + gdbstub_printk("DBMR10 %08lx ", __get_dbmr0(1)); + gdbstub_printk("DBMR11 %08lx\n", __get_dbmr1(1)); + + gdbstub_printk("\n"); +} /* end gdbstub_dump_debugregs() */ + +/*****************************************************************************/ +/* + * dump the MMU state into a structure so that it can be accessed with GDB + */ +void gdbstub_get_mmu_state(void) +{ + asm volatile("movsg hsr0,%0" : "=r"(__debug_mmu.regs.hsr0)); + asm volatile("movsg pcsr,%0" : "=r"(__debug_mmu.regs.pcsr)); + asm volatile("movsg esr0,%0" : "=r"(__debug_mmu.regs.esr0)); + asm volatile("movsg ear0,%0" : "=r"(__debug_mmu.regs.ear0)); + asm volatile("movsg epcr0,%0" : "=r"(__debug_mmu.regs.epcr0)); + + /* read the protection / SAT registers */ + __debug_mmu.iamr[0].L = __get_IAMLR(0); + __debug_mmu.iamr[0].P = __get_IAMPR(0); + __debug_mmu.iamr[1].L = __get_IAMLR(1); + __debug_mmu.iamr[1].P = __get_IAMPR(1); + __debug_mmu.iamr[2].L = __get_IAMLR(2); + __debug_mmu.iamr[2].P = __get_IAMPR(2); + __debug_mmu.iamr[3].L = __get_IAMLR(3); + __debug_mmu.iamr[3].P = __get_IAMPR(3); + __debug_mmu.iamr[4].L = __get_IAMLR(4); + __debug_mmu.iamr[4].P = __get_IAMPR(4); + __debug_mmu.iamr[5].L = __get_IAMLR(5); + __debug_mmu.iamr[5].P = __get_IAMPR(5); + __debug_mmu.iamr[6].L = __get_IAMLR(6); + __debug_mmu.iamr[6].P = __get_IAMPR(6); + __debug_mmu.iamr[7].L = __get_IAMLR(7); + __debug_mmu.iamr[7].P = __get_IAMPR(7); + __debug_mmu.iamr[8].L = __get_IAMLR(8); + __debug_mmu.iamr[8].P = __get_IAMPR(8); + __debug_mmu.iamr[9].L = __get_IAMLR(9); + __debug_mmu.iamr[9].P = __get_IAMPR(9); + __debug_mmu.iamr[10].L = __get_IAMLR(10); + __debug_mmu.iamr[10].P = __get_IAMPR(10); + __debug_mmu.iamr[11].L = __get_IAMLR(11); + __debug_mmu.iamr[11].P = __get_IAMPR(11); + __debug_mmu.iamr[12].L = __get_IAMLR(12); + __debug_mmu.iamr[12].P = __get_IAMPR(12); + __debug_mmu.iamr[13].L = __get_IAMLR(13); + __debug_mmu.iamr[13].P = __get_IAMPR(13); + __debug_mmu.iamr[14].L = __get_IAMLR(14); + __debug_mmu.iamr[14].P = __get_IAMPR(14); + __debug_mmu.iamr[15].L = __get_IAMLR(15); + __debug_mmu.iamr[15].P = __get_IAMPR(15); + + __debug_mmu.damr[0].L = __get_DAMLR(0); + __debug_mmu.damr[0].P = __get_DAMPR(0); + __debug_mmu.damr[1].L = __get_DAMLR(1); + __debug_mmu.damr[1].P = __get_DAMPR(1); + __debug_mmu.damr[2].L = __get_DAMLR(2); + __debug_mmu.damr[2].P = __get_DAMPR(2); + __debug_mmu.damr[3].L = __get_DAMLR(3); + __debug_mmu.damr[3].P = __get_DAMPR(3); + __debug_mmu.damr[4].L = __get_DAMLR(4); + __debug_mmu.damr[4].P = __get_DAMPR(4); + __debug_mmu.damr[5].L = __get_DAMLR(5); + __debug_mmu.damr[5].P = __get_DAMPR(5); + __debug_mmu.damr[6].L = __get_DAMLR(6); + __debug_mmu.damr[6].P = __get_DAMPR(6); + __debug_mmu.damr[7].L = __get_DAMLR(7); + __debug_mmu.damr[7].P = __get_DAMPR(7); + __debug_mmu.damr[8].L = __get_DAMLR(8); + __debug_mmu.damr[8].P = __get_DAMPR(8); + __debug_mmu.damr[9].L = __get_DAMLR(9); + __debug_mmu.damr[9].P = __get_DAMPR(9); + __debug_mmu.damr[10].L = __get_DAMLR(10); + __debug_mmu.damr[10].P = __get_DAMPR(10); + __debug_mmu.damr[11].L = __get_DAMLR(11); + __debug_mmu.damr[11].P = __get_DAMPR(11); + __debug_mmu.damr[12].L = __get_DAMLR(12); + __debug_mmu.damr[12].P = __get_DAMPR(12); + __debug_mmu.damr[13].L = __get_DAMLR(13); + __debug_mmu.damr[13].P = __get_DAMPR(13); + __debug_mmu.damr[14].L = __get_DAMLR(14); + __debug_mmu.damr[14].P = __get_DAMPR(14); + __debug_mmu.damr[15].L = __get_DAMLR(15); + __debug_mmu.damr[15].P = __get_DAMPR(15); + +#ifdef CONFIG_MMU + do { + /* read the DAT entries from the TLB */ + struct __debug_amr *p; + int loop; + + asm volatile("movsg tplr,%0" : "=r"(__debug_mmu.regs.tplr)); + asm volatile("movsg tppr,%0" : "=r"(__debug_mmu.regs.tppr)); + asm volatile("movsg tpxr,%0" : "=r"(__debug_mmu.regs.tpxr)); + asm volatile("movsg cxnr,%0" : "=r"(__debug_mmu.regs.cxnr)); + + p = __debug_mmu.tlb; + + /* way 0 */ + asm volatile("movgs %0,tpxr" :: "r"(0 << TPXR_WAY_SHIFT)); + for (loop = 0; loop < 64; loop++) { + asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); + asm volatile("movsg tplr,%0" : "=r"(p->L)); + asm volatile("movsg tppr,%0" : "=r"(p->P)); + p++; + } + + /* way 1 */ + asm volatile("movgs %0,tpxr" :: "r"(1 << TPXR_WAY_SHIFT)); + for (loop = 0; loop < 64; loop++) { + asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); + asm volatile("movsg tplr,%0" : "=r"(p->L)); + asm volatile("movsg tppr,%0" : "=r"(p->P)); + p++; + } + + asm volatile("movgs %0,tplr" :: "r"(__debug_mmu.regs.tplr)); + asm volatile("movgs %0,tppr" :: "r"(__debug_mmu.regs.tppr)); + asm volatile("movgs %0,tpxr" :: "r"(__debug_mmu.regs.tpxr)); + } while(0); +#endif + +} /* end gdbstub_get_mmu_state() */ + +/*****************************************************************************/ +/* + * handle event interception and GDB remote protocol processing + * - on entry: + * PSR.ET==0, PSR.S==1 and the CPU is in debug mode + * __debug_frame points to the saved registers + * __frame points to the kernel mode exception frame, if it was in kernel + * mode when the break happened + */ +void gdbstub(int sigval) +{ + unsigned long addr, length, loop, dbar, temp, temp2, temp3; + uint32_t zero; + char *ptr; + int flush_cache = 0; + + LEDS(0x5000); + + if (sigval < 0) { +#ifndef CONFIG_GDBSTUB_IMMEDIATE + /* return immediately if GDB immediate activation option not set */ + return; +#else + sigval = SIGINT; +#endif + } + + save_user_regs(&__break_user_context); + +#if 0 + gdbstub_printk("--> gdbstub() %08x %p %08x %08x\n", + __debug_frame->pc, + __debug_frame, + __debug_regs->brr, + __debug_regs->bpsr); +// gdbstub_show_regs(); +#endif + + LEDS(0x5001); + + /* if we were interrupted by input on the serial gdbstub serial port, + * restore the context prior to the interrupt so that we return to that + * directly + */ + temp = (unsigned long) __entry_kerneltrap_table; + temp2 = (unsigned long) __entry_usertrap_table; + temp3 = __debug_frame->pc & ~15; + + if (temp3 == temp + TBR_TT_INTERRUPT_15 || + temp3 == temp2 + TBR_TT_INTERRUPT_15 + ) { + asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); + __debug_frame->psr |= PSR_ET; + __debug_frame->psr &= ~PSR_S; + if (__debug_frame->psr & PSR_PS) + __debug_frame->psr |= PSR_S; + __debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12; + __debug_regs->brr |= BRR_EB; + sigval = SIGINT; + } + + /* handle the decrement timer going off (FR451 only) */ + if (temp3 == temp + TBR_TT_DECREMENT_TIMER || + temp3 == temp2 + TBR_TT_DECREMENT_TIMER + ) { + asm volatile("movgs %0,timerd" :: "r"(10000000)); + asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); + __debug_frame->psr |= PSR_ET; + __debug_frame->psr &= ~PSR_S; + if (__debug_frame->psr & PSR_PS) + __debug_frame->psr |= PSR_S; + __debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12; + __debug_regs->brr |= BRR_EB; + sigval = SIGXCPU;; + } + + LEDS(0x5002); + + /* after a BREAK insn, the PC lands on the far side of it */ + if (__debug_regs->brr & BRR_SB) + gdbstub_check_breakpoint(); + + LEDS(0x5003); + + /* handle attempts to write console data via GDB "O" commands */ + if (__debug_frame->pc == (unsigned long) gdbstub_console_write + 4) { + __gdbstub_console_write((struct console *) __debug_frame->gr8, + (const char *) __debug_frame->gr9, + (unsigned) __debug_frame->gr10); + goto done; + } + + if (gdbstub_rx_unget) { + sigval = SIGINT; + goto packet_waiting; + } + + if (!sigval) + sigval = gdbstub_compute_signal(__debug_regs->brr); + + LEDS(0x5004); + + /* send a message to the debugger's user saying what happened if it may + * not be clear cut (we can't map exceptions onto signals properly) + */ + if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) { + static const char title[] = "Break "; + static const char crlf[] = "\r\n"; + unsigned long brr = __debug_regs->brr; + char hx; + + ptr = output_buffer; + *ptr++ = 'O'; + ptr = mem2hex(title, ptr, sizeof(title) - 1,0); + + hx = hexchars[(brr & 0xf0000000) >> 28]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x0f000000) >> 24]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x00f00000) >> 20]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x000f0000) >> 16]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x0000f000) >> 12]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x00000f00) >> 8]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x000000f0) >> 4]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + hx = hexchars[(brr & 0x0000000f)]; + *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; + + ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); + *ptr = 0; + gdbstub_send_packet(output_buffer); /* send it off... */ + } + + LEDS(0x5005); + + /* tell the debugger that an exception has occurred */ + ptr = output_buffer; + + /* Send trap type (converted to signal) */ + *ptr++ = 'T'; + *ptr++ = hexchars[sigval >> 4]; + *ptr++ = hexchars[sigval & 0xf]; + + /* Send Error PC */ + *ptr++ = hexchars[GDB_REG_PC >> 4]; + *ptr++ = hexchars[GDB_REG_PC & 0xf]; + *ptr++ = ':'; + ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); + *ptr++ = ';'; + + /* + * Send frame pointer + */ + *ptr++ = hexchars[GDB_REG_FP >> 4]; + *ptr++ = hexchars[GDB_REG_FP & 0xf]; + *ptr++ = ':'; + ptr = mem2hex(&__debug_frame->fp, ptr, 4, 0); + *ptr++ = ';'; + + /* + * Send stack pointer + */ + *ptr++ = hexchars[GDB_REG_SP >> 4]; + *ptr++ = hexchars[GDB_REG_SP & 0xf]; + *ptr++ = ':'; + ptr = mem2hex(&__debug_frame->sp, ptr, 4, 0); + *ptr++ = ';'; + + *ptr++ = 0; + gdbstub_send_packet(output_buffer); /* send it off... */ + + LEDS(0x5006); + + packet_waiting: + gdbstub_get_mmu_state(); + + /* wait for input from remote GDB */ + while (1) { + output_buffer[0] = 0; + + LEDS(0x5007); + gdbstub_recv_packet(input_buffer); + LEDS(0x5600 | input_buffer[0]); + + switch (input_buffer[0]) { + /* request repeat of last signal number */ + case '?': + output_buffer[0] = 'S'; + output_buffer[1] = hexchars[sigval >> 4]; + output_buffer[2] = hexchars[sigval & 0xf]; + output_buffer[3] = 0; + break; + + case 'd': + /* toggle debug flag */ + break; + + /* return the value of the CPU registers + * - GR0, GR1, GR2, GR3, GR4, GR5, GR6, GR7, + * - GR8, GR9, GR10, GR11, GR12, GR13, GR14, GR15, + * - GR16, GR17, GR18, GR19, GR20, GR21, GR22, GR23, + * - GR24, GR25, GR26, GR27, GR28, GR29, GR30, GR31, + * - GR32, GR33, GR34, GR35, GR36, GR37, GR38, GR39, + * - GR40, GR41, GR42, GR43, GR44, GR45, GR46, GR47, + * - GR48, GR49, GR50, GR51, GR52, GR53, GR54, GR55, + * - GR56, GR57, GR58, GR59, GR60, GR61, GR62, GR63, + * - FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7, + * - FP8, FP9, FP10, FP11, FP12, FP13, FP14, FP15, + * - FP16, FP17, FP18, FP19, FP20, FP21, FP22, FP23, + * - FP24, FP25, FP26, FP27, FP28, FP29, FP30, FP31, + * - FP32, FP33, FP34, FP35, FP36, FP37, FP38, FP39, + * - FP40, FP41, FP42, FP43, FP44, FP45, FP46, FP47, + * - FP48, FP49, FP50, FP51, FP52, FP53, FP54, FP55, + * - FP56, FP57, FP58, FP59, FP60, FP61, FP62, FP63, + * - PC, PSR, CCR, CCCR, + * - _X132, _X133, _X134 + * - TBR, BRR, DBAR0, DBAR1, DBAR2, DBAR3, + * - _X141, _X142, _X143, _X144, + * - LR, LCR + */ + case 'g': + zero = 0; + ptr = output_buffer; + + /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ + ptr = mem2hex(&zero, ptr, 4, 0); + + for (loop = 1; loop <= 27; loop++) + ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(loop), + ptr, 4, 0); + temp = (unsigned long) __frame; + ptr = mem2hex(&temp, ptr, 4, 0); + ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(29), ptr, 4, 0); + ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(30), ptr, 4, 0); +#ifdef CONFIG_MMU + ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(31), ptr, 4, 0); +#else + temp = (unsigned long) __debug_frame; + ptr = mem2hex(&temp, ptr, 4, 0); +#endif + + for (loop = 32; loop <= 63; loop++) + ptr = mem2hex((unsigned long *)__debug_frame + REG_GR(loop), + ptr, 4, 0); + + /* deal with FR0-FR63 */ + for (loop = 0; loop <= 63; loop++) + ptr = mem2hex((unsigned long *)&__break_user_context + + __FPMEDIA_FR(loop), + ptr, 4, 0); + + /* deal with special registers */ + ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->psr, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->ccr, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->cccr, ptr, 4, 0); + ptr = mem2hex(&zero, ptr, 4, 0); + ptr = mem2hex(&zero, ptr, 4, 0); + ptr = mem2hex(&zero, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->tbr, ptr, 4, 0); + ptr = mem2hex(&__debug_regs->brr , ptr, 4, 0); + + asm volatile("movsg dbar0,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg dbar1,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg dbar2,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg dbar3,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + + asm volatile("movsg scr0,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg scr1,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg scr2,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + asm volatile("movsg scr3,%0" : "=r"(dbar)); + ptr = mem2hex(&dbar, ptr, 4, 0); + + ptr = mem2hex(&__debug_frame->lr, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->lcr, ptr, 4, 0); + + ptr = mem2hex(&__debug_frame->iacc0, ptr, 8, 0); + + ptr = mem2hex(&__break_user_context.f.fsr[0], ptr, 4, 0); + + for (loop = 0; loop <= 7; loop++) + ptr = mem2hex(&__break_user_context.f.acc[loop], ptr, 4, 0); + + ptr = mem2hex(&__break_user_context.f.accg, ptr, 8, 0); + + for (loop = 0; loop <= 1; loop++) + ptr = mem2hex(&__break_user_context.f.msr[loop], ptr, 4, 0); + + ptr = mem2hex(&__debug_frame->gner0, ptr, 4, 0); + ptr = mem2hex(&__debug_frame->gner1, ptr, 4, 0); + + ptr = mem2hex(&__break_user_context.f.fner[0], ptr, 4, 0); + ptr = mem2hex(&__break_user_context.f.fner[1], ptr, 4, 0); + + break; + + /* set the values of the CPU registers */ + case 'G': + ptr = &input_buffer[1]; + + /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ + ptr = hex2mem(ptr, &temp, 4); + + for (loop = 1; loop <= 27; loop++) + ptr = hex2mem(ptr, (unsigned long *)__debug_frame + REG_GR(loop), + 4); + + ptr = hex2mem(ptr, &temp, 4); + __frame = (struct pt_regs *) temp; + ptr = hex2mem(ptr, &__debug_frame->gr29, 4); + ptr = hex2mem(ptr, &__debug_frame->gr30, 4); +#ifdef CONFIG_MMU + ptr = hex2mem(ptr, &__debug_frame->gr31, 4); +#else + ptr = hex2mem(ptr, &temp, 4); +#endif + + for (loop = 32; loop <= 63; loop++) + ptr = hex2mem(ptr, (unsigned long *)__debug_frame + REG_GR(loop), + 4); + + /* deal with FR0-FR63 */ + for (loop = 0; loop <= 63; loop++) + ptr = mem2hex((unsigned long *)&__break_user_context + + __FPMEDIA_FR(loop), + ptr, 4, 0); + + /* deal with special registers */ + ptr = hex2mem(ptr, &__debug_frame->pc, 4); + ptr = hex2mem(ptr, &__debug_frame->psr, 4); + ptr = hex2mem(ptr, &__debug_frame->ccr, 4); + ptr = hex2mem(ptr, &__debug_frame->cccr,4); + + for (loop = 132; loop <= 140; loop++) + ptr = hex2mem(ptr, &temp, 4); + + ptr = hex2mem(ptr, &temp, 4); + asm volatile("movgs %0,scr0" :: "r"(temp)); + ptr = hex2mem(ptr, &temp, 4); + asm volatile("movgs %0,scr1" :: "r"(temp)); + ptr = hex2mem(ptr, &temp, 4); + asm volatile("movgs %0,scr2" :: "r"(temp)); + ptr = hex2mem(ptr, &temp, 4); + asm volatile("movgs %0,scr3" :: "r"(temp)); + + ptr = hex2mem(ptr, &__debug_frame->lr, 4); + ptr = hex2mem(ptr, &__debug_frame->lcr, 4); + + ptr = hex2mem(ptr, &__debug_frame->iacc0, 8); + + ptr = hex2mem(ptr, &__break_user_context.f.fsr[0], 4); + + for (loop = 0; loop <= 7; loop++) + ptr = hex2mem(ptr, &__break_user_context.f.acc[loop], 4); + + ptr = hex2mem(ptr, &__break_user_context.f.accg, 8); + + for (loop = 0; loop <= 1; loop++) + ptr = hex2mem(ptr, &__break_user_context.f.msr[loop], 4); + + ptr = hex2mem(ptr, &__debug_frame->gner0, 4); + ptr = hex2mem(ptr, &__debug_frame->gner1, 4); + + ptr = hex2mem(ptr, &__break_user_context.f.fner[0], 4); + ptr = hex2mem(ptr, &__break_user_context.f.fner[1], 4); + + gdbstub_strcpy(output_buffer,"OK"); + break; + + /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ + case 'm': + ptr = &input_buffer[1]; + + if (hexToInt(&ptr, &addr) && + *ptr++ == ',' && + hexToInt(&ptr, &length) + ) { + if (mem2hex((char *)addr, output_buffer, length, 1)) + break; + gdbstub_strcpy (output_buffer, "E03"); + } + else { + gdbstub_strcpy(output_buffer,"E01"); + } + break; + + /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ + case 'M': + ptr = &input_buffer[1]; + + if (hexToInt(&ptr, &addr) && + *ptr++ == ',' && + hexToInt(&ptr, &length) && + *ptr++ == ':' + ) { + if (hex2mem(ptr, (char *)addr, length)) { + gdbstub_strcpy(output_buffer, "OK"); + } + else { + gdbstub_strcpy(output_buffer, "E03"); + } + } + else + gdbstub_strcpy(output_buffer, "E02"); + + flush_cache = 1; + break; + + /* PNN,=RRRRRRRR: Write value R to reg N return OK */ + case 'P': + ptr = &input_buffer[1]; + + if (!hexToInt(&ptr, &addr) || + *ptr++ != '=' || + !hexToInt(&ptr, &temp) + ) { + gdbstub_strcpy(output_buffer, "E01"); + break; + } + + temp2 = 1; + switch (addr) { + case GDB_REG_GR(0): + break; + case GDB_REG_GR(1) ... GDB_REG_GR(63): + __break_user_context.i.gr[addr - GDB_REG_GR(0)] = temp; + break; + case GDB_REG_FR(0) ... GDB_REG_FR(63): + __break_user_context.f.fr[addr - GDB_REG_FR(0)] = temp; + break; + case GDB_REG_PC: + __break_user_context.i.pc = temp; + break; + case GDB_REG_PSR: + __break_user_context.i.psr = temp; + break; + case GDB_REG_CCR: + __break_user_context.i.ccr = temp; + break; + case GDB_REG_CCCR: + __break_user_context.i.cccr = temp; + break; + case GDB_REG_BRR: + __debug_regs->brr = temp; + break; + case GDB_REG_LR: + __break_user_context.i.lr = temp; + break; + case GDB_REG_LCR: + __break_user_context.i.lcr = temp; + break; + case GDB_REG_FSR0: + __break_user_context.f.fsr[0] = temp; + break; + case GDB_REG_ACC(0) ... GDB_REG_ACC(7): + __break_user_context.f.acc[addr - GDB_REG_ACC(0)] = temp; + break; + case GDB_REG_ACCG(0): + *(uint32_t *) &__break_user_context.f.accg[0] = temp; + break; + case GDB_REG_ACCG(4): + *(uint32_t *) &__break_user_context.f.accg[4] = temp; + break; + case GDB_REG_MSR(0) ... GDB_REG_MSR(1): + __break_user_context.f.msr[addr - GDB_REG_MSR(0)] = temp; + break; + case GDB_REG_GNER(0) ... GDB_REG_GNER(1): + __break_user_context.i.gner[addr - GDB_REG_GNER(0)] = temp; + break; + case GDB_REG_FNER(0) ... GDB_REG_FNER(1): + __break_user_context.f.fner[addr - GDB_REG_FNER(0)] = temp; + break; + default: + temp2 = 0; + break; + } + + if (temp2) { + gdbstub_strcpy(output_buffer, "OK"); + } + else { + gdbstub_strcpy(output_buffer, "E02"); + } + break; + + /* cAA..AA Continue at address AA..AA(optional) */ + case 'c': + /* try to read optional parameter, pc unchanged if no parm */ + ptr = &input_buffer[1]; + if (hexToInt(&ptr, &addr)) + __debug_frame->pc = addr; + goto done; + + /* kill the program */ + case 'k' : + goto done; /* just continue */ + + + /* reset the whole machine (FIXME: system dependent) */ + case 'r': + break; + + + /* step to next instruction */ + case 's': + __debug_regs->dcr |= DCR_SE; + goto done; + + /* set baud rate (bBB) */ + case 'b': + ptr = &input_buffer[1]; + if (!hexToInt(&ptr, &temp)) { + gdbstub_strcpy(output_buffer,"B01"); + break; + } + + if (temp) { + /* ack before changing speed */ + gdbstub_send_packet("OK"); + gdbstub_set_baud(temp); + } + break; + + /* set breakpoint */ + case 'Z': + ptr = &input_buffer[1]; + + if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || + !hexToInt(&ptr,&addr) || *ptr++ != ',' || + !hexToInt(&ptr,&length) + ) { + gdbstub_strcpy(output_buffer,"E01"); + break; + } + + if (temp >= 5) { + gdbstub_strcpy(output_buffer,"E03"); + break; + } + + if (gdbstub_set_breakpoint(temp, addr, length) < 0) { + gdbstub_strcpy(output_buffer,"E03"); + break; + } + + if (temp == 0) + flush_cache = 1; /* soft bkpt by modified memory */ + + gdbstub_strcpy(output_buffer,"OK"); + break; + + /* clear breakpoint */ + case 'z': + ptr = &input_buffer[1]; + + if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || + !hexToInt(&ptr,&addr) || *ptr++ != ',' || + !hexToInt(&ptr,&length) + ) { + gdbstub_strcpy(output_buffer,"E01"); + break; + } + + if (temp >= 5) { + gdbstub_strcpy(output_buffer,"E03"); + break; + } + + if (gdbstub_clear_breakpoint(temp, addr, length) < 0) { + gdbstub_strcpy(output_buffer,"E03"); + break; + } + + if (temp == 0) + flush_cache = 1; /* soft bkpt by modified memory */ + + gdbstub_strcpy(output_buffer,"OK"); + break; + + default: + gdbstub_proto("### GDB Unsupported Cmd '%s'\n",input_buffer); + break; + } + + /* reply to the request */ + LEDS(0x5009); + gdbstub_send_packet(output_buffer); + } + + done: + restore_user_regs(&__break_user_context); + + //gdbstub_dump_debugregs(); + //gdbstub_printk("<-- gdbstub() %08x\n", __debug_frame->pc); + + /* need to flush the instruction cache before resuming, as we may have + * deposited a breakpoint, and the icache probably has no way of + * knowing that a data ref to some location may have changed something + * that is in the instruction cache. NB: We flush both caches, just to + * be sure... + */ + + /* note: flushing the icache will clobber EAR0 on the FR451 */ + if (flush_cache) + gdbstub_purge_cache(); + + LEDS(0x5666); + +} /* end gdbstub() */ + +/*****************************************************************************/ +/* + * initialise the GDB stub + */ +void __init gdbstub_init(void) +{ +#ifdef CONFIG_GDBSTUB_IMMEDIATE + unsigned char ch; + int ret; +#endif + + gdbstub_printk("%s", gdbstub_banner); + gdbstub_printk("DCR: %x\n", __debug_regs->dcr); + + gdbstub_io_init(); + + /* try to talk to GDB (or anyone insane enough to want to type GDB protocol by hand) */ + gdbstub_proto("### GDB Tx ACK\n"); + gdbstub_tx_char('+'); /* 'hello world' */ + +#ifdef CONFIG_GDBSTUB_IMMEDIATE + gdbstub_printk("GDB Stub waiting for packet\n"); + + /* + * In case GDB is started before us, ack any packets + * (presumably "$?#xx") sitting there. + */ + do { gdbstub_rx_char(&ch, 0); } while (ch != '$'); + do { gdbstub_rx_char(&ch, 0); } while (ch != '#'); + do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat first csum byte */ + do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat second csum byte */ + + gdbstub_proto("### GDB Tx NAK\n"); + gdbstub_tx_char('-'); /* nak it */ + +#else + gdbstub_printk("GDB Stub set\n"); +#endif + +#if 0 + /* send banner */ + ptr = output_buffer; + *ptr++ = 'O'; + ptr = mem2hex(gdbstub_banner, ptr, sizeof(gdbstub_banner) - 1, 0); + gdbstub_send_packet(output_buffer); +#endif +#if defined(CONFIG_GDBSTUB_CONSOLE) && defined(CONFIG_GDBSTUB_IMMEDIATE) + register_console(&gdbstub_console); +#endif + +} /* end gdbstub_init() */ + +/*****************************************************************************/ +/* + * register the console at a more appropriate time + */ +#if defined (CONFIG_GDBSTUB_CONSOLE) && !defined(CONFIG_GDBSTUB_IMMEDIATE) +static int __init gdbstub_postinit(void) +{ + printk("registering console\n"); + register_console(&gdbstub_console); + return 0; +} /* end gdbstub_postinit() */ + +__initcall(gdbstub_postinit); +#endif + +/*****************************************************************************/ +/* + * send an exit message to GDB + */ +void gdbstub_exit(int status) +{ + unsigned char checksum; + int count; + unsigned char ch; + + sprintf(output_buffer,"W%02x",status&0xff); + + gdbstub_tx_char('$'); + checksum = 0; + count = 0; + + while ((ch = output_buffer[count]) != 0) { + gdbstub_tx_char(ch); + checksum += ch; + count += 1; + } + + gdbstub_tx_char('#'); + gdbstub_tx_char(hexchars[checksum >> 4]); + gdbstub_tx_char(hexchars[checksum & 0xf]); + + /* make sure the output is flushed, or else RedBoot might clobber it */ + gdbstub_tx_char('-'); + gdbstub_tx_flush(); + +} /* end gdbstub_exit() */ + +/*****************************************************************************/ +/* + * GDB wants to call malloc() and free() to allocate memory for calling kernel + * functions directly from its command line + */ +static void *malloc(size_t size) __attribute__((unused)); +static void *malloc(size_t size) +{ + return kmalloc(size, GFP_ATOMIC); +} + +static void free(void *p) __attribute__((unused)); +static void free(void *p) +{ + kfree(p); +} + +static uint32_t ___get_HSR0(void) __attribute__((unused)); +static uint32_t ___get_HSR0(void) +{ + return __get_HSR(0); +} + +static uint32_t ___set_HSR0(uint32_t x) __attribute__((unused)); +static uint32_t ___set_HSR0(uint32_t x) +{ + __set_HSR(0, x); + return __get_HSR(0); +} |
