diff options
Diffstat (limited to 'kernel/arch/h8300/kernel/ptrace_h.c')
-rw-r--r-- | kernel/arch/h8300/kernel/ptrace_h.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/kernel/arch/h8300/kernel/ptrace_h.c b/kernel/arch/h8300/kernel/ptrace_h.c new file mode 100644 index 000000000..fe3b5673b --- /dev/null +++ b/kernel/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); +} |