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Commit 0896a9be authored by Jason Wessel's avatar Jason Wessel
Browse files

kgdb,mips: Individual register get/set for mips 



Implement the ability to individually get and set registers for kdb
and kgdb for mips.

Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
CC: linux-mips@linux-mips.org
parent 12bfa3de

arch/mips/include/asm/kgdb.h

+9 −10
Original line number Diff line number Diff line
@@ -9,27 +9,26 @@ 
	(_MIPS_ISA == _MIPS_ISA_MIPS32)



#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 GDB_SIZEOF_REG		sizeof(u32)

#else /* CONFIG_CPU_32BIT */

#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

arch/mips/kernel/kgdb.c

+145 −58
Original line number Diff line number Diff line
@@ -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__(
@@ -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.