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kgdb,mips: Individual register get/set for mips
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Implement the ability to individually get and set registers for kdb
and kgdb for mips.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
CC: linux-mips@linux-mips.org
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Jason Wessel committed Aug 5, 2010
1 parent 12bfa3d commit 0896a9b
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Showing 2 changed files with 154 additions and 68 deletions.
19 changes: 9 additions & 10 deletions arch/mips/include/asm/kgdb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,28 +8,27 @@
#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
(_MIPS_ISA == _MIPS_ISA_MIPS32)

#define KGDB_GDB_REG_SIZE 32
#define KGDB_GDB_REG_SIZE 32
#define GDB_SIZEOF_REG sizeof(u32)

#elif (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
(_MIPS_ISA == _MIPS_ISA_MIPS64)

#ifdef CONFIG_32BIT
#define KGDB_GDB_REG_SIZE 32
#define KGDB_GDB_REG_SIZE 32
#define GDB_SIZEOF_REG sizeof(u32)
#else /* CONFIG_CPU_32BIT */
#define KGDB_GDB_REG_SIZE 64
#define KGDB_GDB_REG_SIZE 64
#define GDB_SIZEOF_REG sizeof(u64)
#endif
#else
#error "Need to set KGDB_GDB_REG_SIZE for MIPS ISA"
#endif /* _MIPS_ISA */

#define BUFMAX 2048
#if (KGDB_GDB_REG_SIZE == 32)
#define NUMREGBYTES (90*sizeof(u32))
#define NUMCRITREGBYTES (12*sizeof(u32))
#else
#define NUMREGBYTES (90*sizeof(u64))
#define NUMCRITREGBYTES (12*sizeof(u64))
#endif
#define DBG_MAX_REG_NUM 72
#define NUMREGBYTES (DBG_MAX_REG_NUM * sizeof(GDB_SIZEOF_REG))
#define NUMCRITREGBYTES (12 * sizeof(GDB_SIZEOF_REG))
#define BREAK_INSTR_SIZE 4
#define CACHE_FLUSH_IS_SAFE 0

Expand Down
203 changes: 145 additions & 58 deletions arch/mips/kernel/kgdb.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,151 @@ static struct hard_trap_info {
{ 0, 0} /* Must be last */
};

struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
{ "zero", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[0]) },
{ "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[1]) },
{ "v0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[2]) },
{ "v1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[3]) },
{ "a0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[4]) },
{ "a1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[5]) },
{ "a2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[6]) },
{ "a3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[7]) },
{ "t0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[8]) },
{ "t1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[9]) },
{ "t2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[10]) },
{ "t3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[11]) },
{ "t4", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[12]) },
{ "t5", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[13]) },
{ "t6", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[14]) },
{ "t7", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[15]) },
{ "s0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[16]) },
{ "s1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[17]) },
{ "s2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[18]) },
{ "s3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[19]) },
{ "s4", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[20]) },
{ "s5", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[21]) },
{ "s6", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[22]) },
{ "s7", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[23]) },
{ "t8", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[24]) },
{ "t9", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[25]) },
{ "k0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[26]) },
{ "k1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[27]) },
{ "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[28]) },
{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[29]) },
{ "s8", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[30]) },
{ "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[31]) },
{ "sr", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_status) },
{ "lo", GDB_SIZEOF_REG, offsetof(struct pt_regs, lo) },
{ "hi", GDB_SIZEOF_REG, offsetof(struct pt_regs, hi) },
{ "bad", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_badvaddr) },
{ "cause", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_cause) },
{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_epc) },
{ "f0", GDB_SIZEOF_REG, 0 },
{ "f1", GDB_SIZEOF_REG, 1 },
{ "f2", GDB_SIZEOF_REG, 2 },
{ "f3", GDB_SIZEOF_REG, 3 },
{ "f4", GDB_SIZEOF_REG, 4 },
{ "f5", GDB_SIZEOF_REG, 5 },
{ "f6", GDB_SIZEOF_REG, 6 },
{ "f7", GDB_SIZEOF_REG, 7 },
{ "f8", GDB_SIZEOF_REG, 8 },
{ "f9", GDB_SIZEOF_REG, 9 },
{ "f10", GDB_SIZEOF_REG, 10 },
{ "f11", GDB_SIZEOF_REG, 11 },
{ "f12", GDB_SIZEOF_REG, 12 },
{ "f13", GDB_SIZEOF_REG, 13 },
{ "f14", GDB_SIZEOF_REG, 14 },
{ "f15", GDB_SIZEOF_REG, 15 },
{ "f16", GDB_SIZEOF_REG, 16 },
{ "f17", GDB_SIZEOF_REG, 17 },
{ "f18", GDB_SIZEOF_REG, 18 },
{ "f19", GDB_SIZEOF_REG, 19 },
{ "f20", GDB_SIZEOF_REG, 20 },
{ "f21", GDB_SIZEOF_REG, 21 },
{ "f22", GDB_SIZEOF_REG, 22 },
{ "f23", GDB_SIZEOF_REG, 23 },
{ "f24", GDB_SIZEOF_REG, 24 },
{ "f25", GDB_SIZEOF_REG, 25 },
{ "f26", GDB_SIZEOF_REG, 26 },
{ "f27", GDB_SIZEOF_REG, 27 },
{ "f28", GDB_SIZEOF_REG, 28 },
{ "f29", GDB_SIZEOF_REG, 29 },
{ "f30", GDB_SIZEOF_REG, 30 },
{ "f31", GDB_SIZEOF_REG, 31 },
{ "fsr", GDB_SIZEOF_REG, 0 },
{ "fir", GDB_SIZEOF_REG, 0 },
};

int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
int fp_reg;

if (regno < 0 || regno >= DBG_MAX_REG_NUM)
return -EINVAL;

if (dbg_reg_def[regno].offset != -1 && regno < 38) {
memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
dbg_reg_def[regno].size);
} else if (current && dbg_reg_def[regno].offset != -1 && regno < 72) {
/* FP registers 38 -> 69 */
if (!(regs->cp0_status & ST0_CU1))
return 0;
if (regno == 70) {
/* Process the fcr31/fsr (register 70) */
memcpy((void *)&current->thread.fpu.fcr31, mem,
dbg_reg_def[regno].size);
goto out_save;
} else if (regno == 71) {
/* Ignore the fir (register 71) */
goto out_save;
}
fp_reg = dbg_reg_def[regno].offset;
memcpy((void *)&current->thread.fpu.fpr[fp_reg], mem,
dbg_reg_def[regno].size);
out_save:
restore_fp(current);
}

return 0;
}

char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
int fp_reg;

if (regno >= DBG_MAX_REG_NUM || regno < 0)
return NULL;

if (dbg_reg_def[regno].offset != -1 && regno < 38) {
/* First 38 registers */
memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
dbg_reg_def[regno].size);
} else if (current && dbg_reg_def[regno].offset != -1 && regno < 72) {
/* FP registers 38 -> 69 */
if (!(regs->cp0_status & ST0_CU1))
goto out;
save_fp(current);
if (regno == 70) {
/* Process the fcr31/fsr (register 70) */
memcpy(mem, (void *)&current->thread.fpu.fcr31,
dbg_reg_def[regno].size);
goto out;
} else if (regno == 71) {
/* Ignore the fir (register 71) */
memset(mem, 0, dbg_reg_def[regno].size);
goto out;
}
fp_reg = dbg_reg_def[regno].offset;
memcpy(mem, (void *)&current->thread.fpu.fpr[fp_reg],
dbg_reg_def[regno].size);
}

out:
return dbg_reg_def[regno].name;

}

void arch_kgdb_breakpoint(void)
{
__asm__ __volatile__(
Expand Down Expand Up @@ -84,64 +229,6 @@ static int compute_signal(int tt)
return SIGHUP; /* default for things we don't know about */
}

void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
int reg;

#if (KGDB_GDB_REG_SIZE == 32)
u32 *ptr = (u32 *)gdb_regs;
#else
u64 *ptr = (u64 *)gdb_regs;
#endif

for (reg = 0; reg < 32; reg++)
*(ptr++) = regs->regs[reg];

*(ptr++) = regs->cp0_status;
*(ptr++) = regs->lo;
*(ptr++) = regs->hi;
*(ptr++) = regs->cp0_badvaddr;
*(ptr++) = regs->cp0_cause;
*(ptr++) = regs->cp0_epc;

/* FP REGS */
if (!(current && (regs->cp0_status & ST0_CU1)))
return;

save_fp(current);
for (reg = 0; reg < 32; reg++)
*(ptr++) = current->thread.fpu.fpr[reg];
}

void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
int reg;

#if (KGDB_GDB_REG_SIZE == 32)
const u32 *ptr = (u32 *)gdb_regs;
#else
const u64 *ptr = (u64 *)gdb_regs;
#endif

for (reg = 0; reg < 32; reg++)
regs->regs[reg] = *(ptr++);

regs->cp0_status = *(ptr++);
regs->lo = *(ptr++);
regs->hi = *(ptr++);
regs->cp0_badvaddr = *(ptr++);
regs->cp0_cause = *(ptr++);
regs->cp0_epc = *(ptr++);

/* FP REGS from current */
if (!(current && (regs->cp0_status & ST0_CU1)))
return;

for (reg = 0; reg < 32; reg++)
current->thread.fpu.fpr[reg] = *(ptr++);
restore_fp(current);
}

/*
* Similar to regs_to_gdb_regs() except that process is sleeping and so
* we may not be able to get all the info.
Expand Down

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