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author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-05-11 02:34:48 +0900 |
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committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 13:35:52 +0900 |
commit | fe54616d857da4ccb482eb40fef0e0f3b3d0efaf (patch) | |
tree | 181ef0d088a7b383f37225d463de3dcb1f78f613 /arch/h8300/kernel | |
parent | 06706c96ed753f952e53fa9840fb38852d2fe37e (diff) | |
download | op-kernel-dev-fe54616d857da4ccb482eb40fef0e0f3b3d0efaf.zip op-kernel-dev-fe54616d857da4ccb482eb40fef0e0f3b3d0efaf.tar.gz |
h8300: process helpers
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/kernel')
-rw-r--r-- | arch/h8300/kernel/process.c | 171 | ||||
-rw-r--r-- | arch/h8300/kernel/ptrace.c | 203 | ||||
-rw-r--r-- | arch/h8300/kernel/ptrace_h.c | 256 | ||||
-rw-r--r-- | arch/h8300/kernel/ptrace_s.c | 44 |
4 files changed, 674 insertions, 0 deletions
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c new file mode 100644 index 0000000..dee4125 --- /dev/null +++ b/arch/h8300/kernel/process.c @@ -0,0 +1,171 @@ +/* + * linux/arch/h8300/kernel/process.c + * + * Yoshinori Sato <ysato@users.sourceforge.jp> + * + * Based on: + * + * linux/arch/m68knommu/kernel/process.c + * + * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, + * Kenneth Albanowski <kjahds@kjahds.com>, + * The Silver Hammer Group, Ltd. + * + * linux/arch/m68k/kernel/process.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * 68060 fixes by Jesper Skov + */ + +/* + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/interrupt.h> +#include <linux/reboot.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/rcupdate.h> + +#include <asm/uaccess.h> +#include <asm/traps.h> +#include <asm/setup.h> +#include <asm/pgtable.h> + +void (*pm_power_off)(void) = NULL; +EXPORT_SYMBOL(pm_power_off); + +asmlinkage void ret_from_fork(void); +asmlinkage void ret_from_kernel_thread(void); + +/* + * The idle loop on an H8/300.. + */ +void arch_cpu_idle(void) +{ + local_irq_enable(); + __asm__("sleep"); +} + +void machine_restart(char *__unused) +{ + local_irq_disable(); + __asm__("jmp @@0"); +} + +void machine_halt(void) +{ + local_irq_disable(); + __asm__("sleep"); + for (;;) + ; +} + +void machine_power_off(void) +{ + local_irq_disable(); + __asm__("sleep"); + for (;;) + ; +} + +void show_regs(struct pt_regs *regs) +{ + show_regs_print_info(KERN_DEFAULT); + + pr_notice("\n"); + pr_notice("PC: %08lx Status: %02x\n", + regs->pc, regs->ccr); + pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n", + regs->orig_er0, regs->er0, regs->er1); + pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n", + regs->er2, regs->er3, regs->er4, regs->er5); + pr_notice("ER6' %08lx ", regs->er6); + if (user_mode(regs)) + printk("USP: %08lx\n", rdusp()); + else + printk("\n"); +} + +void flush_thread(void) +{ +} + +int copy_thread(unsigned long clone_flags, + unsigned long usp, unsigned long topstk, + struct task_struct *p) +{ + struct pt_regs *childregs; + + childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; + + if (unlikely(p->flags & PF_KTHREAD)) { + memset(childregs, 0, sizeof(struct pt_regs)); + childregs->retpc = (unsigned long) ret_from_kernel_thread; + childregs->er4 = topstk; /* arg */ + childregs->er5 = usp; /* fn */ + } else { + *childregs = *current_pt_regs(); + childregs->er0 = 0; + childregs->retpc = (unsigned long) ret_from_fork; + p->thread.usp = usp ?: rdusp(); + } + p->thread.ksp = (unsigned long)childregs; + + return 0; +} + +unsigned long thread_saved_pc(struct task_struct *tsk) +{ + return ((struct pt_regs *)tsk->thread.esp0)->pc; +} + +unsigned long get_wchan(struct task_struct *p) +{ + unsigned long fp, pc; + unsigned long stack_page; + int count = 0; + + if (!p || p == current || p->state == TASK_RUNNING) + return 0; + + stack_page = (unsigned long)p; + fp = ((struct pt_regs *)p->thread.ksp)->er6; + do { + if (fp < stack_page+sizeof(struct thread_info) || + fp >= 8184+stack_page) + return 0; + pc = ((unsigned long *)fp)[1]; + if (!in_sched_functions(pc)) + return pc; + fp = *(unsigned long *) fp; + } while (count++ < 16); + return 0; +} + +/* generic sys_clone is not enough registers */ +asmlinkage int sys_clone(unsigned long __user *args) +{ + unsigned long clone_flags; + unsigned long newsp; + uintptr_t parent_tidptr; + uintptr_t child_tidptr; + + get_user(clone_flags, &args[0]); + get_user(newsp, &args[1]); + get_user(parent_tidptr, &args[2]); + get_user(child_tidptr, &args[3]); + return do_fork(clone_flags, newsp, 0, + (int __user *)parent_tidptr, (int __user *)child_tidptr); +} diff --git a/arch/h8300/kernel/ptrace.c b/arch/h8300/kernel/ptrace.c new file mode 100644 index 0000000..9207554 --- /dev/null +++ b/arch/h8300/kernel/ptrace.c @@ -0,0 +1,203 @@ +/* + * linux/arch/h8300/kernel/ptrace.c + * + * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of + * this archive for more details. + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/ptrace.h> +#include <linux/audit.h> +#include <linux/tracehook.h> +#include <linux/regset.h> +#include <linux/elf.h> + +#define CCR_MASK 0x6f /* mode/imask not set */ +#define EXR_MASK 0x80 /* modify only T */ + +#define PT_REG(r) offsetof(struct pt_regs, r) + +extern void user_disable_single_step(struct task_struct *child); + +/* Mapping from PT_xxx to the stack offset at which the register is + saved. Notice that usp has no stack-slot and needs to be treated + specially (see get_reg/put_reg below). */ +static const int register_offset[] = { + PT_REG(er1), PT_REG(er2), PT_REG(er3), PT_REG(er4), + PT_REG(er5), PT_REG(er6), PT_REG(er0), -1, + PT_REG(orig_er0), PT_REG(ccr), PT_REG(pc), +#if defined(CONFIG_CPU_H8S) + PT_REG(exr), +#endif +}; + +/* read register */ +long h8300_get_reg(struct task_struct *task, int regno) +{ + switch (regno) { + case PT_USP: + return task->thread.usp + sizeof(long)*2; + case PT_CCR: + case PT_EXR: + return *(unsigned short *)(task->thread.esp0 + + register_offset[regno]); + default: + return *(unsigned long *)(task->thread.esp0 + + register_offset[regno]); + } +} + +int h8300_put_reg(struct task_struct *task, int regno, unsigned long data) +{ + unsigned short oldccr; + unsigned short oldexr; + + switch (regno) { + case PT_USP: + task->thread.usp = data - sizeof(long)*2; + case PT_CCR: + oldccr = *(unsigned short *)(task->thread.esp0 + + register_offset[regno]); + oldccr &= ~CCR_MASK; + data &= CCR_MASK; + data |= oldccr; + *(unsigned short *)(task->thread.esp0 + + register_offset[regno]) = data; + break; + case PT_EXR: + oldexr = *(unsigned short *)(task->thread.esp0 + + register_offset[regno]); + oldccr &= ~EXR_MASK; + data &= EXR_MASK; + data |= oldexr; + *(unsigned short *)(task->thread.esp0 + + register_offset[regno]) = data; + break; + default: + *(unsigned long *)(task->thread.esp0 + + register_offset[regno]) = data; + break; + } + return 0; +} + +static int regs_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + int r; + struct user_regs_struct regs; + long *reg = (long *)®s; + + /* build user regs in buffer */ + for (r = 0; r < ARRAY_SIZE(register_offset); r++) + *reg++ = h8300_get_reg(target, r); + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + ®s, 0, sizeof(regs)); +} + +static int regs_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int r; + int ret; + struct user_regs_struct regs; + long *reg; + + /* build user regs in buffer */ + for (reg = (long *)®s, r = 0; r < ARRAY_SIZE(register_offset); r++) + *reg++ = h8300_get_reg(target, r); + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + ®s, 0, sizeof(regs)); + if (ret) + return ret; + + /* write back to pt_regs */ + for (reg = (long *)®s, r = 0; r < ARRAY_SIZE(register_offset); r++) + h8300_put_reg(target, r, *reg++); + return 0; +} + +enum h8300_regset { + REGSET_GENERAL, +}; + +static const struct user_regset h8300_regsets[] = { + [REGSET_GENERAL] = { + .core_note_type = NT_PRSTATUS, + .n = ELF_NGREG, + .size = sizeof(long), + .align = sizeof(long), + .get = regs_get, + .set = regs_set, + }, +}; + +static const struct user_regset_view user_h8300_native_view = { + .name = "h8300", + .e_machine = EM_H8_300, + .regsets = h8300_regsets, + .n = ARRAY_SIZE(h8300_regsets), +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + return &user_h8300_native_view; +} + +void ptrace_disable(struct task_struct *child) +{ + user_disable_single_step(child); +} + +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + int ret; + + switch (request) { + default: + ret = ptrace_request(child, request, addr, data); + break; + } + return ret; +} + +asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) +{ + long ret = 0; + + if (test_thread_flag(TIF_SYSCALL_TRACE) && + tracehook_report_syscall_entry(regs)) + /* + * Tracing decided this syscall should not happen. + * We'll return a bogus call number to get an ENOSYS + * error, but leave the original number in regs->regs[0]. + */ + ret = -1L; + + audit_syscall_entry(regs->er1, regs->er2, regs->er3, + regs->er4, regs->er5); + + return ret ?: regs->er0; +} + +asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) +{ + int step; + + audit_syscall_exit(regs); + + step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, step); +} diff --git a/arch/h8300/kernel/ptrace_h.c b/arch/h8300/kernel/ptrace_h.c new file mode 100644 index 0000000..fe3b567 --- /dev/null +++ b/arch/h8300/kernel/ptrace_h.c @@ -0,0 +1,256 @@ +/* + * ptrace cpu depend helper functions + * + * Copyright 2003, 2015 Yoshinori Sato <ysato@users.sourceforge.jp> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of + * this archive for more details. + */ + +#include <linux/linkage.h> +#include <linux/sched.h> +#include <asm/ptrace.h> + +#define BREAKINST 0x5730 /* trapa #3 */ + +/* disable singlestep */ +void user_disable_single_step(struct task_struct *child) +{ + if ((long)child->thread.breakinfo.addr != -1L) { + *(child->thread.breakinfo.addr) = child->thread.breakinfo.inst; + child->thread.breakinfo.addr = (unsigned short *)-1L; + } +} + +/* calculate next pc */ +enum jump_type {none, /* normal instruction */ + jabs, /* absolute address jump */ + ind, /* indirect address jump */ + ret, /* return to subrutine */ + reg, /* register indexed jump */ + relb, /* pc relative jump (byte offset) */ + relw, /* pc relative jump (word offset) */ + }; + +/* opcode decode table define + ptn: opcode pattern + msk: opcode bitmask + len: instruction length (<0 next table index) + jmp: jump operation mode */ +struct optable { + unsigned char bitpattern; + unsigned char bitmask; + signed char length; + signed char type; +} __packed __aligned(1); + +#define OPTABLE(ptn, msk, len, jmp) \ + { \ + .bitpattern = ptn, \ + .bitmask = msk, \ + .length = len, \ + .type = jmp, \ + } + +static const struct optable optable_0[] = { + OPTABLE(0x00, 0xff, 1, none), /* 0x00 */ + OPTABLE(0x01, 0xff, -1, none), /* 0x01 */ + OPTABLE(0x02, 0xfe, 1, none), /* 0x02-0x03 */ + OPTABLE(0x04, 0xee, 1, none), /* 0x04-0x05/0x14-0x15 */ + OPTABLE(0x06, 0xfe, 1, none), /* 0x06-0x07 */ + OPTABLE(0x08, 0xea, 1, none), /* 0x08-0x09/0x0c-0x0d/0x18-0x19/0x1c-0x1d */ + OPTABLE(0x0a, 0xee, 1, none), /* 0x0a-0x0b/0x1a-0x1b */ + OPTABLE(0x0e, 0xee, 1, none), /* 0x0e-0x0f/0x1e-0x1f */ + OPTABLE(0x10, 0xfc, 1, none), /* 0x10-0x13 */ + OPTABLE(0x16, 0xfe, 1, none), /* 0x16-0x17 */ + OPTABLE(0x20, 0xe0, 1, none), /* 0x20-0x3f */ + OPTABLE(0x40, 0xf0, 1, relb), /* 0x40-0x4f */ + OPTABLE(0x50, 0xfc, 1, none), /* 0x50-0x53 */ + OPTABLE(0x54, 0xfd, 1, ret), /* 0x54/0x56 */ + OPTABLE(0x55, 0xff, 1, relb), /* 0x55 */ + OPTABLE(0x57, 0xff, 1, none), /* 0x57 */ + OPTABLE(0x58, 0xfb, 2, relw), /* 0x58/0x5c */ + OPTABLE(0x59, 0xfb, 1, reg), /* 0x59/0x5b */ + OPTABLE(0x5a, 0xfb, 2, jabs), /* 0x5a/0x5e */ + OPTABLE(0x5b, 0xfb, 2, ind), /* 0x5b/0x5f */ + OPTABLE(0x60, 0xe8, 1, none), /* 0x60-0x67/0x70-0x77 */ + OPTABLE(0x68, 0xfa, 1, none), /* 0x68-0x69/0x6c-0x6d */ + OPTABLE(0x6a, 0xfe, -2, none), /* 0x6a-0x6b */ + OPTABLE(0x6e, 0xfe, 2, none), /* 0x6e-0x6f */ + OPTABLE(0x78, 0xff, 4, none), /* 0x78 */ + OPTABLE(0x79, 0xff, 2, none), /* 0x79 */ + OPTABLE(0x7a, 0xff, 3, none), /* 0x7a */ + OPTABLE(0x7b, 0xff, 2, none), /* 0x7b */ + OPTABLE(0x7c, 0xfc, 2, none), /* 0x7c-0x7f */ + OPTABLE(0x80, 0x80, 1, none), /* 0x80-0xff */ +}; + +static const struct optable optable_1[] = { + OPTABLE(0x00, 0xff, -3, none), /* 0x0100 */ + OPTABLE(0x40, 0xf0, -3, none), /* 0x0140-0x14f */ + OPTABLE(0x80, 0xf0, 1, none), /* 0x0180-0x018f */ + OPTABLE(0xc0, 0xc0, 2, none), /* 0x01c0-0x01ff */ +}; + +static const struct optable optable_2[] = { + OPTABLE(0x00, 0x20, 2, none), /* 0x6a0?/0x6a8?/0x6b0?/0x6b8? */ + OPTABLE(0x20, 0x20, 3, none), /* 0x6a2?/0x6aa?/0x6b2?/0x6ba? */ +}; + +static const struct optable optable_3[] = { + OPTABLE(0x69, 0xfb, 2, none), /* 0x010069/0x01006d/014069/0x01406d */ + OPTABLE(0x6b, 0xff, -4, none), /* 0x01006b/0x01406b */ + OPTABLE(0x6f, 0xff, 3, none), /* 0x01006f/0x01406f */ + OPTABLE(0x78, 0xff, 5, none), /* 0x010078/0x014078 */ +}; + +static const struct optable optable_4[] = { +/* 0x0100690?/0x01006d0?/0140690?/0x01406d0?/ + 0x0100698?/0x01006d8?/0140698?/0x01406d8? */ + OPTABLE(0x00, 0x78, 3, none), +/* 0x0100692?/0x01006d2?/0140692?/0x01406d2?/ + 0x010069a?/0x01006da?/014069a?/0x01406da? */ + OPTABLE(0x20, 0x78, 4, none), +}; + +static const struct optables_list { + const struct optable *ptr; + int size; +} optables[] = { +#define OPTABLES(no) \ + { \ + .ptr = optable_##no, \ + .size = sizeof(optable_##no) / sizeof(struct optable), \ + } + OPTABLES(0), + OPTABLES(1), + OPTABLES(2), + OPTABLES(3), + OPTABLES(4), + +}; + +const unsigned char condmask[] = { + 0x00, 0x40, 0x01, 0x04, 0x02, 0x08, 0x10, 0x20 +}; + +static int isbranch(struct task_struct *task, int reson) +{ + unsigned char cond = h8300_get_reg(task, PT_CCR); + + /* encode complex conditions */ + /* B4: N^V + B5: Z|(N^V) + B6: C|Z */ + __asm__("bld #3,%w0\n\t" + "bxor #1,%w0\n\t" + "bst #4,%w0\n\t" + "bor #2,%w0\n\t" + "bst #5,%w0\n\t" + "bld #2,%w0\n\t" + "bor #0,%w0\n\t" + "bst #6,%w0\n\t" + : "=&r"(cond) : "0"(cond) : "cc"); + cond &= condmask[reson >> 1]; + if (!(reson & 1)) + return cond == 0; + else + return cond != 0; +} + +static unsigned short *decode(struct task_struct *child, + const struct optable *op, + char *fetch_p, unsigned short *pc, + unsigned char inst) +{ + unsigned long addr; + unsigned long *sp; + int regno; + + switch (op->type) { + case none: + return (unsigned short *)pc + op->length; + case jabs: + addr = *(unsigned long *)pc; + return (unsigned short *)(addr & 0x00ffffff); + case ind: + addr = *pc & 0xff; + return (unsigned short *)(*(unsigned long *)addr); + case ret: + sp = (unsigned long *)h8300_get_reg(child, PT_USP); + /* user stack frames + | er0 | temporary saved + +--------+ + | exp | exception stack frames + +--------+ + | ret pc | userspace return address + */ + return (unsigned short *)(*(sp+2) & 0x00ffffff); + case reg: + regno = (*pc >> 4) & 0x07; + if (regno == 0) + addr = h8300_get_reg(child, PT_ER0); + else + addr = h8300_get_reg(child, regno-1 + PT_ER1); + return (unsigned short *)addr; + case relb: + if (inst == 0x55 || isbranch(child, inst & 0x0f)) + pc = (unsigned short *)((unsigned long)pc + + ((signed char)(*fetch_p))); + return pc+1; /* skip myself */ + case relw: + if (inst == 0x5c || isbranch(child, (*fetch_p & 0xf0) >> 4)) + pc = (unsigned short *)((unsigned long)pc + + ((signed short)(*(pc+1)))); + return pc+2; /* skip myself */ + default: + return NULL; + } +} + +static unsigned short *nextpc(struct task_struct *child, unsigned short *pc) +{ + const struct optable *op; + unsigned char *fetch_p; + int op_len; + unsigned char inst; + + op = optables[0].ptr; + op_len = optables[0].size; + fetch_p = (unsigned char *)pc; + inst = *fetch_p++; + do { + if ((inst & op->bitmask) == op->bitpattern) { + if (op->length < 0) { + op = optables[-op->length].ptr; + op_len = optables[-op->length].size + 1; + inst = *fetch_p++; + } else + return decode(child, op, fetch_p, pc, inst); + } else + op++; + } while (--op_len > 0); + return NULL; +} + +/* Set breakpoint(s) to simulate a single step from the current PC. */ + +void user_enable_single_step(struct task_struct *child) +{ + unsigned short *next; + + next = nextpc(child, (unsigned short *)h8300_get_reg(child, PT_PC)); + child->thread.breakinfo.addr = next; + child->thread.breakinfo.inst = *next; + *next = BREAKINST; +} + +asmlinkage void trace_trap(unsigned long bp) +{ + if ((unsigned long)current->thread.breakinfo.addr == bp) { + user_disable_single_step(current); + force_sig(SIGTRAP, current); + } else + force_sig(SIGILL, current); +} diff --git a/arch/h8300/kernel/ptrace_s.c b/arch/h8300/kernel/ptrace_s.c new file mode 100644 index 0000000..ef5a9c1 --- /dev/null +++ b/arch/h8300/kernel/ptrace_s.c @@ -0,0 +1,44 @@ +/* + * linux/arch/h8300/kernel/ptrace_h8s.c + * ptrace cpu depend helper functions + * + * Yoshinori Sato <ysato@users.sourceforge.jp> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of + * this archive for more details. + */ + +#include <linux/linkage.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <asm/ptrace.h> + +#define CCR_MASK 0x6f +#define EXR_TRACE 0x80 + +/* disable singlestep */ +void user_disable_single_step(struct task_struct *child) +{ + unsigned char exr; + + exr = h8300_get_reg(child, PT_EXR); + exr &= ~EXR_TRACE; + h8300_put_reg(child, PT_EXR, exr); +} + +/* enable singlestep */ +void user_enable_single_step(struct task_struct *child) +{ + unsigned char exr; + + exr = h8300_get_reg(child, PT_EXR); + exr |= EXR_TRACE; + h8300_put_reg(child, PT_EXR, exr); +} + +asmlinkage void trace_trap(unsigned long bp) +{ + (void)bp; + force_sig(SIGTRAP, current); +} |