+++ /dev/null
-/*
- * linux/arch/h8300/platform/h8300h/ptrace_h8300h.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 <asm/ptrace.h>
-
-#define CCR_MASK 0x6f /* mode/imask not set */
-#define BREAKINST 0x5730 /* trapa #3 */
-
-/* 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 h8300_register_offset[] = {
- PT_REG(er1), PT_REG(er2), PT_REG(er3), PT_REG(er4),
- PT_REG(er5), PT_REG(er6), PT_REG(er0), PT_REG(orig_er0),
- PT_REG(ccr), PT_REG(pc)
-};
-
-/* 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:
- return *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
- default:
- return *(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]);
- }
-}
-
-/* write register */
-int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
-{
- unsigned short oldccr;
- switch (regno) {
- case PT_USP:
- task->thread.usp = data - sizeof(long)*2;
- case PT_CCR:
- oldccr = *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
- oldccr &= ~CCR_MASK;
- data &= CCR_MASK;
- data |= oldccr;
- *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
- break;
- default:
- *(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
- break;
- }
- return 0;
-}
-
-/* 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;
-} __attribute__((aligned(1),packed));
-
-#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[] = {
- OPTABLE(0x00,0x78, 3,none), /* 0x0100690?/0x01006d0?/0140690/0x01406d0?/0x0100698?/0x01006d8?/0140698?/0x01406d8? */
- OPTABLE(0x20,0x78, 4,none), /* 0x0100692?/0x01006d2?/0140692/0x01406d2?/0x010069a?/0x01006da?/014069a?/0x01406da? */
-};
-
-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)::"cc");
- cond &= condmask[reson >> 1];
- if (!(reson & 1))
- return cond == 0;
- else
- return cond != 0;
-}
-
-static unsigned short *getnextpc(struct task_struct *child, unsigned short *pc)
-{
- const struct optable *op;
- unsigned char *fetch_p;
- unsigned char inst;
- unsigned long addr;
- unsigned long *sp;
- int op_len,regno;
- 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 {
- switch (op->type) {
- case none:
- return 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 */
- }
- }
- } 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 *nextpc;
- nextpc = getnextpc(child,(unsigned short *)h8300_get_reg(child, PT_PC));
- child->thread.breakinfo.addr = nextpc;
- child->thread.breakinfo.inst = *nextpc;
- *nextpc = 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);
-}
-
git.samba.org / sfrench / cifs-2.6.git / blobdiff