diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c')
-rw-r--r-- | gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c | 710 |
1 files changed, 0 insertions, 710 deletions
diff --git a/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c b/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c deleted file mode 100644 index a346f47..0000000 --- a/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c +++ /dev/null @@ -1,710 +0,0 @@ -/* $FreeBSD$ */ -/* Native-dependent code for BSD Unix running on i386's, for GDB. - Copyright 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc. - -This file is part of GDB. - -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. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "defs.h" - -#include <sys/types.h> -#include <sys/ptrace.h> -#include <machine/reg.h> -#include <machine/frame.h> -#include <sys/param.h> -#include <sys/user.h> -#include "gdbcore.h" -#include "value.h" -#include "inferior.h" - -#if defined(HAVE_GREGSET_T) || defined(HAVE_FPREGSET_T) -#include <sys/procfs.h> -#endif - -/* this table must line up with REGISTER_NAMES in tm-i386v.h */ -/* symbols like 'tEAX' come from <machine/reg.h> */ -static int tregmap[] = -{ - tEAX, tECX, tEDX, tEBX, - tESP, tEBP, tESI, tEDI, - tEIP, tEFLAGS, tCS, tSS, - tDS, tES, tFS, tGS, -}; - -static struct save87 pcb_savefpu; - -void -fetch_inferior_registers (regno) - int regno; -{ - struct reg inferior_registers; /* ptrace order, not gcc/gdb order */ - int r; - - ptrace (PT_GETREGS, inferior_pid, - (PTRACE_ARG3_TYPE) &inferior_registers, 0); - - for (r = 0; r < NUM_REGS; r++) - memcpy (®isters[REGISTER_BYTE (r)], ((int *)&inferior_registers) + tregmap[r], 4); - - registers_fetched (); -} - -void -store_inferior_registers (regno) - int regno; -{ - struct reg inferior_registers; /* ptrace order, not gcc/gdb order */ - int r; - - for (r = 0; r < NUM_REGS; r++) - memcpy (((int *)&inferior_registers) + tregmap[r], ®isters[REGISTER_BYTE (r)], 4); - - ptrace (PT_SETREGS, inferior_pid, - (PTRACE_ARG3_TYPE) &inferior_registers, 0); -} - -/* Extract the register values out of the core file and store - them where `read_register' will find them. - Extract the floating point state out of the core file and store - it where `float_info' will find it. - - CORE_REG_SECT points to the register values themselves, read into memory. - CORE_REG_SIZE is the size of that area. - WHICH says which set of registers we are handling (0 = int, 2 = float - on machines where they are discontiguous). - REG_ADDR is the offset from u.u_ar0 to the register values relative to - core_reg_sect. This is used with old-fashioned core files to - locate the registers in a large upage-plus-stack ".reg" section. - Original upage address X is at location core_reg_sect+x+reg_addr. - */ - -static void -fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) - char *core_reg_sect; - unsigned core_reg_size; - int which; - CORE_ADDR reg_addr; -{ - register int regno; - register int cregno; - register int addr; - int bad_reg = -1; - int offset; - struct pcb *tmp_pcbaddr; - - /* - * First get virtual address of user structure. Then calculate offset. - */ - memcpy(&tmp_pcbaddr, - &((struct user *) core_reg_sect)->u_kproc.ki_pcb, - sizeof(tmp_pcbaddr)); - offset = -reg_addr - (int) tmp_pcbaddr; - - for (regno = 0; regno < NUM_REGS; regno++) - { - cregno = tregmap[regno]; - if (cregno == tGS) - addr = offsetof (struct pcb, pcb_gs); - else - addr = offset + 4 * cregno; - if (addr < 0 || addr >= core_reg_size) - { - if (bad_reg < 0) - bad_reg = regno; - } - else - { - supply_register (regno, core_reg_sect + addr); - } - } - if (bad_reg >= 0) - { - error ("Register %s not found in core file.", gdb_register_names[bad_reg]); - } - - addr = offsetof (struct pcb, pcb_save); - memcpy (&pcb_savefpu, core_reg_sect + addr, sizeof pcb_savefpu); -} - -#ifdef FLOAT_INFO -#include "expression.h" -#include "language.h" /* for local_hex_string */ -#include "floatformat.h" - -#include <sys/param.h> -#include <signal.h> -#include <sys/ioctl.h> -#include <fcntl.h> - -#include <a.out.h> - -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/uio.h> -#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */ -#include <sys/user.h> -#undef curpcb -#include <sys/file.h> -#include "gdb_stat.h" -#include <sys/ptrace.h> - -extern void print_387_control_word (); /* i387-tdep.h */ -extern void print_387_status_word (); - -#define fpstate save87 - -static void -i387_to_double (from, to) - char *from; - char *to; -{ - long *lp; - /* push extended mode on 387 stack, then pop in double mode - * - * first, set exception masks so no error is generated - - * number will be rounded to inf or 0, if necessary - */ - asm ("pushl %eax"); /* grab a stack slot */ - asm ("fstcw (%esp)"); /* get 387 control word */ - asm ("movl (%esp),%eax"); /* save old value */ - asm ("orl $0x3f,%eax"); /* mask all exceptions */ - asm ("pushl %eax"); - asm ("fldcw (%esp)"); /* load new value into 387 */ - - asm ("movl 8(%ebp),%eax"); - asm ("fldt (%eax)"); /* push extended number on 387 stack */ - asm ("fwait"); - asm ("movl 12(%ebp),%eax"); - asm ("fstpl (%eax)"); /* pop double */ - asm ("fwait"); - - asm ("popl %eax"); /* flush modified control word */ - asm ("fnclex"); /* clear exceptions */ - asm ("fldcw (%esp)"); /* restore original control word */ - asm ("popl %eax"); /* flush saved copy */ -} - -struct env387 -{ - unsigned short control; - unsigned short r0; - unsigned short status; - unsigned short r1; - unsigned short tag; - unsigned short r2; - unsigned long eip; - unsigned short code_seg; - unsigned short opcode; - unsigned long operand; - unsigned short operand_seg; - unsigned short r3; - unsigned char regs[8][10]; -}; - -static void -print_387_status (status, ep) - unsigned short status; - struct env387 *ep; -{ - int i; - int bothstatus; - int top; - int fpreg; - - bothstatus = ((status != 0) && (ep->status != 0)); - if (status != 0) - { - if (bothstatus) - printf_unfiltered ("u: "); - print_387_status_word ((unsigned int)status); - } - - if (ep->status != 0) - { - if (bothstatus) - printf_unfiltered ("e: "); - print_387_status_word ((unsigned int)ep->status); - } - - print_387_control_word ((unsigned int)ep->control); - printf_unfiltered ("last instruction: "); - printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode)); - printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg)); - printf_unfiltered ("%s; ", local_hex_string(ep->eip)); - printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg)); - printf_unfiltered (":%s\n", local_hex_string(ep->operand)); - - top = (ep->status >> 11) & 7; - - printf_unfiltered (" regno tag msb lsb value\n"); - for (fpreg = 7; fpreg >= 0; fpreg--) - { - int exp; - int mantissa_or; - int normal; - char *sign; - int st_regno; - unsigned short *usregs; - double val; - - /* The physical regno `fpreg' is only relevant as an index into the - * tag word. Logical `%st' numbers are required for indexing ep->regs. - */ - st_regno = (fpreg + 8 - top) & 7; - - printf_unfiltered ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " "); - - switch ((ep->tag >> (fpreg * 2)) & 3) - { - case 0: printf_unfiltered ("valid "); break; - case 1: printf_unfiltered ("zero "); break; - case 2: printf_unfiltered ("trap "); break; - case 3: printf_unfiltered ("empty "); break; - } - for (i = 9; i >= 0; i--) - printf_unfiltered ("%02x", ep->regs[st_regno][i]); - - printf_unfiltered (" "); - - /* - * Handle weird cases better than floatformat_to_double () and - * printf (). - */ - usregs = (unsigned short *) ep->regs[st_regno]; - sign = usregs[4] & 0x8000 ? "-" : ""; - exp = usregs[4] & 0x7fff; - normal = usregs[3] & 0x8000; - mantissa_or = usregs[0] | usregs[1] | usregs[2] | (usregs[3] & 0x7fff); - if (exp == 0) - { - if (normal) - printf_unfiltered ("Pseudo Denormal (0 as a double)"); - else if (mantissa_or == 0) - printf_unfiltered ("%s0", sign); - else - printf_unfiltered ("Denormal (0 as a double)"); - } - else if (exp == 0x7fff) - { - if (!normal) - printf_unfiltered ("Pseudo "); - if (mantissa_or == 0) - printf_unfiltered ("%sInf", sign); - else - printf_unfiltered ("%s NaN", - usregs[3] & 0x4000 ? "Quiet" : "Signaling"); - if (!normal) - printf_unfiltered (" (NaN)"); - } - else if (!normal) - printf_unfiltered ("Unnormal (NaN)"); - else - { -#if 0 - /* Use this we stop trapping on overflow. */ - floatformat_to_double(&floatformat_i387_ext, - (char *) ep->regs[st_regno], &val); -#else - i387_to_double((char *) ep->regs[st_regno], (char *) &val); -#endif - printf_unfiltered ("%g", val); - } - printf_unfiltered ("\n"); - } -} - -void -i386_float_info () -{ - struct user u; /* just for address computations */ - int i; - /* fpstate defined in <sys/user.h> */ - struct fpstate *fpstatep; - char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; - char fpvalid; - unsigned int rounded_addr; - unsigned int rounded_size; - /*extern int corechan;*/ - int skip; - extern int inferior_pid; - - if (inferior_pid != 0 && core_bfd == NULL) - { - int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */ - ptrace(PT_GETFPREGS, pid, &buf[0], sizeof(struct fpreg)); - fpstatep = (struct fpstate *)&buf[0]; - } - else - fpstatep = &pcb_savefpu; - - print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep); -} -#endif /* FLOAT_INFO */ - -int -kernel_u_size () -{ - return (sizeof (struct user)); -} - -#ifdef SETUP_ARBITRARY_FRAME -#include "frame.h" -struct frame_info * -setup_arbitrary_frame (argc, argv) - int argc; - CORE_ADDR *argv; -{ - if (argc != 2) - error ("i386 frame specifications require two arguments: sp and pc"); - - return create_new_frame (argv[0], argv[1]); -} -#endif /* SETUP_ARBITRARY_FRAME */ - -#ifdef HAVE_GREGSET_T -void -supply_gregset (gp) - gregset_t *gp; -{ - int regno = 0; - - /* These must be ordered the same as REGISTER_NAMES in - config/i386/tm-i386.h. */ - supply_register (regno++, (char *)&gp->r_eax); - supply_register (regno++, (char *)&gp->r_ecx); - supply_register (regno++, (char *)&gp->r_edx); - supply_register (regno++, (char *)&gp->r_ebx); - supply_register (regno++, (char *)&gp->r_esp); - supply_register (regno++, (char *)&gp->r_ebp); - supply_register (regno++, (char *)&gp->r_esi); - supply_register (regno++, (char *)&gp->r_edi); - supply_register (regno++, (char *)&gp->r_eip); - supply_register (regno++, (char *)&gp->r_eflags); - supply_register (regno++, (char *)&gp->r_cs); - supply_register (regno++, (char *)&gp->r_ss); - supply_register (regno++, (char *)&gp->r_ds); - supply_register (regno++, (char *)&gp->r_es); - supply_register (regno++, (char *)&gp->r_fs); - supply_register (regno++, (char *)&gp->r_gs); -} -#endif /* HAVE_GREGSET_T */ - -#ifdef HAVE_FPREGSET_T -void -supply_fpregset (fp) - fpregset_t *fp; -{ - memcpy (&pcb_savefpu, fp, sizeof pcb_savefpu); -} -#endif /* HAVE_FPREGSET_T */ - -/* Register that we are able to handle aout (trad-core) file formats. */ - -static struct core_fns aout_core_fns = -{ - bfd_target_unknown_flavour, - fetch_core_registers, - NULL -}; - -void -_initialize_core_aout () -{ - add_core_fns (&aout_core_fns); -} - -#ifdef PT_GETDBREGS - -/* - * 0: no trace output - * 1: trace watchpoint requests - * 2: trace `watchpoint hit?' tests, too - */ -#define WATCHPOINT_DEBUG 0 - -#include "breakpoint.h" - -int -can_watch(type, cnt, ot) - int type, cnt, ot; -{ - int rv; - static int cnt_watch, cnt_awatch; - - switch (type) - { - case bp_hardware_watchpoint: - cnt_watch = cnt; - break; - - case bp_access_watchpoint: - cnt_awatch = cnt; - break; - - default: - rv = 0; - goto overandout; - } - - rv = cnt_watch + cnt_awatch <= 4? 1: -1; - - overandout: -#if WATCHPOINT_DEBUG - printf_filtered("can_watch(%d, %d, %d) = %d (counts: w: %d, rw: %d)\n", - type, cnt, ot, rv, cnt_watch, cnt_awatch); -#endif - - return rv; -} - -int -stopped_by_watchpoint() -{ - struct dbreg dbr; - extern int inferior_pid; - - if (current_target.to_shortname == 0 || - ! (strcmp(current_target.to_shortname, "child") == 0 || - strcmp(current_target.to_shortname, "freebsd-uthreads") == 0)) - return 0; - - if (inferior_pid != 0 && core_bfd == NULL) - { - int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */ - - if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1) - { - perror("ptrace(PT_GETDBREGS) failed"); - return 0; - } -#if WATCHPOINT_DEBUG > 1 - printf_filtered("stopped_by_watchpoint(): DR6 = %#x\n", dbr.dr6); -#endif - /* - * If a hardware watchpoint was hit, one of the lower 4 bits in - * DR6 is set (the actual bit indicates which of DR0...DR3 triggered - * the trap). - */ - return dbr.dr6 & 0x0f; - } - else - { - warning("Can't set a watchpoint on a core file."); - return 0; - } -} - -int -insert_watchpoint(addr, len, type) - int addr, len, type; -{ - struct dbreg dbr; - extern int inferior_pid; - - if (current_target.to_shortname == 0 || - ! (strcmp(current_target.to_shortname, "child") == 0 || - strcmp(current_target.to_shortname, "freebsd-uthreads") == 0)) - return 0; - - if (inferior_pid != 0 && core_bfd == NULL) - { - int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */ - int i, mask; - unsigned int sbits; - - if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1) - { - perror("ptrace(PT_GETDBREGS) failed"); - return 0; - } - - for (i = 0, mask = 0x03; i < 4; i++, mask <<= 2) - if ((dbr.dr7 & mask) == 0) - break; - if (i >= 4) { - warning("no more hardware watchpoints available"); - return -1; - } - - /* paranoia */ - if (len > 4) - { - warning("watchpoint length %d unsupported, using lenght = 4", - len); - len = 4; - } - else if (len == 3) - { - warning("weird watchpoint length 3, using 2"); - len = 2; - } - else if (len == 0) - { - warning("weird watchpoint length 0, using 1"); - len = 1; - } - - switch (len) - { - case 1: sbits = 0; break; - case 2: sbits = 4; break; - case 4: sbits = 0x0c; break; - } - - /* - * The `type' value is 0 for `watch on write', 1 for `watch on - * read', 2 for `watch on both'. The i386 debug register - * breakpoint types are 0 for `execute' (not used in GDB), 1 for - * `write', and 4 for `read/write'. Plain `read' trapping is - * not supported on i386, value 3 is illegal. - */ - switch (type) - { - default: - warning("weird watchpoint type %d, using a write watchpoint"); - /* FALLTHROUGH */ - case 0: - sbits |= 1; - break; - - case 2: - sbits |= 3; - break; - } - sbits <<= 4 * i + 16; - sbits |= 1 << 2 * i; - - dbr.dr7 |= sbits; - *(&dbr.dr0 + i) = (unsigned int)addr; - -#if WATCHPOINT_DEBUG - printf_filtered("insert_watchpoint(), inserting DR7 = %#x, DR%d = %#x\n", - dbr.dr7, i, addr); -#endif - if (ptrace(PT_SETDBREGS, pid, (caddr_t)&dbr, 0) == -1) - { - perror("ptrace(PT_SETDBREGS) failed"); - return 0; - } - } - else - { - warning("Can't set a watchpoint on a core file."); - return 0; - } -} - -int -remove_watchpoint(addr, len, type) - int addr, len, type; -{ - struct dbreg dbr; - extern int inferior_pid; - - if (current_target.to_shortname == 0 || - ! (strcmp(current_target.to_shortname, "child") == 0 || - strcmp(current_target.to_shortname, "freebsd-uthreads") == 0)) - return 0; - - if (inferior_pid != 0 && core_bfd == NULL) - { - int pid = inferior_pid & ((1 << 17) - 1); /* XXX extract pid from tid */ - int i; - unsigned int sbits, *dbregp; - - if (ptrace(PT_GETDBREGS, pid, (caddr_t)&dbr, 0) == -1) - { - perror("ptrace(PT_GETDBREGS) failed"); - return 0; - } - - for (i = 0, dbregp = &dbr.dr0; i < 4; i++, dbregp++) - if (*dbregp == (unsigned int)addr) - break; - if (i >= 4) - { - warning("watchpoint for address %#x not found", addr); - return -1; - } - - *dbregp = 0; - sbits = 0xf << (4 * i + 16); - sbits |= 3 << 2 * i; - dbr.dr7 &= ~sbits; - -#if WATCHPOINT_DEBUG - printf_filtered("remove_watchpoint(): removing watchpoint for %#x, DR7 = %#x\n", - addr, dbr.dr7); -#endif - if (ptrace(PT_SETDBREGS, pid, (caddr_t)&dbr, 0) == -1) - { - perror("ptrace(PT_SETDBREGS) failed"); - return 0; - } - } - else - { - warning("Can't set a watchpoint on a core file."); - return 0; - } -} - -#endif /* PT_GETDBREGS */ - -CORE_ADDR -fbsd_sigtramp_saved_pc (frame) - struct frame_info *frame; -{ - CORE_ADDR sigcontext_addr; - CORE_ADDR sigcode_addr; - char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; - int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT; - int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT; - int sigcode_offs = (-1 * TARGET_INT_BIT) / TARGET_CHAR_BIT; - - /* Get sigcontext address, it is the third parameter on the stack. */ - if (frame->next) - sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next) - + FRAME_ARGS_SKIP - + sigcontext_offs, - ptrbytes); - else - sigcontext_addr = read_memory_integer (read_register (SP_REGNUM) - + sigcontext_offs, - ptrbytes); - -#ifdef OSIGCODE_MAGIC_OFFSET - if (frame->next) - sigcode_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next) - + FRAME_ARGS_SKIP - + sigcode_offs, - ptrbytes); - else - sigcode_addr = read_memory_integer (read_register (SP_REGNUM) - + sigcode_offs, - ptrbytes); - target_read_memory (sigcode_addr + OSIGCODE_MAGIC_OFFSET, - buf, ptrbytes); - if (extract_unsigned_integer(buf, ptrbytes) == 0x01d516) { - target_read_memory (sigcontext_addr + OSIGCONTEXT_PC_OFFSET, - buf, ptrbytes); - } else -#endif - /* Don't cause a memory_error when accessing sigcontext in case the stack - layout has changed or the stack is corrupt. */ - target_read_memory (sigcontext_addr + NSIGCONTEXT_PC_OFFSET, buf, ptrbytes); - return extract_unsigned_integer (buf, ptrbytes); -} |