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Subject[PATCH 06/15] arm,kgdb: Individual register get/set for arm
Date
Implement the ability to individually get and set registers for kdb
and kgdb for arm.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-arm-kernel@lists.infradead.org
---
arch/arm/include/asm/kgdb.h | 6 +-
arch/arm/kernel/kgdb.c | 88 ++++++++++++++++++++++--------------------
2 files changed, 49 insertions(+), 45 deletions(-)

diff --git a/arch/arm/include/asm/kgdb.h b/arch/arm/include/asm/kgdb.h
index 67af4b8..0826599 100644
--- a/arch/arm/include/asm/kgdb.h
+++ b/arch/arm/include/asm/kgdb.h
@@ -70,11 +70,11 @@ extern int kgdb_fault_expected;
#define _GP_REGS 16
#define _FP_REGS 8
#define _EXTRA_REGS 2
-#define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
+#define DBG_MAX_REG_NUM (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)

#define KGDB_MAX_NO_CPUS 1
#define BUFMAX 400
-#define NUMREGBYTES (GDB_MAX_REGS << 2)
+#define NUMREGBYTES (DBG_MAX_REG_NUM << 2)
#define NUMCRITREGBYTES (32 << 2)

#define _R0 0
@@ -93,7 +93,7 @@ extern int kgdb_fault_expected;
#define _SPT 13
#define _LR 14
#define _PC 15
-#define _CPSR (GDB_MAX_REGS - 1)
+#define _CPSR (DBG_MAX_REG_NUM - 1)

/*
* So that we can denote the end of a frame for tracing,
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index c868a88..cf846ca 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -13,54 +13,58 @@
#include <linux/kgdb.h>
#include <asm/traps.h>

-/* Make a local copy of the registers passed into the handler (bletch) */
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
- int regno;
-
- /* Initialize all to zero. */
- for (regno = 0; regno < GDB_MAX_REGS; regno++)
- gdb_regs[regno] = 0;
+ { "r0", 4, offsetof(struct pt_regs, ARM_r0)},
+ { "r1", 4, offsetof(struct pt_regs, ARM_r1)},
+ { "r2", 4, offsetof(struct pt_regs, ARM_r2)},
+ { "r3", 4, offsetof(struct pt_regs, ARM_r3)},
+ { "r4", 4, offsetof(struct pt_regs, ARM_r4)},
+ { "r5", 4, offsetof(struct pt_regs, ARM_r5)},
+ { "r6", 4, offsetof(struct pt_regs, ARM_r6)},
+ { "r7", 4, offsetof(struct pt_regs, ARM_r7)},
+ { "r8", 4, offsetof(struct pt_regs, ARM_r8)},
+ { "r9", 4, offsetof(struct pt_regs, ARM_r9)},
+ { "r10", 4, offsetof(struct pt_regs, ARM_r10)},
+ { "fp", 4, offsetof(struct pt_regs, ARM_fp)},
+ { "ip", 4, offsetof(struct pt_regs, ARM_ip)},
+ { "sp", 4, offsetof(struct pt_regs, ARM_sp)},
+ { "lr", 4, offsetof(struct pt_regs, ARM_lr)},
+ { "pc", 4, offsetof(struct pt_regs, ARM_pc)},
+ { "f0", 12, -1 },
+ { "f1", 12, -1 },
+ { "f2", 12, -1 },
+ { "f3", 12, -1 },
+ { "f4", 12, -1 },
+ { "f5", 12, -1 },
+ { "f6", 12, -1 },
+ { "f7", 12, -1 },
+ { "fps", 4, -1 },
+ { "cpsr", 4, offsetof(struct pt_regs, ARM_cpsr)},
+};

- gdb_regs[_R0] = kernel_regs->ARM_r0;
- gdb_regs[_R1] = kernel_regs->ARM_r1;
- gdb_regs[_R2] = kernel_regs->ARM_r2;
- gdb_regs[_R3] = kernel_regs->ARM_r3;
- gdb_regs[_R4] = kernel_regs->ARM_r4;
- gdb_regs[_R5] = kernel_regs->ARM_r5;
- gdb_regs[_R6] = kernel_regs->ARM_r6;
- gdb_regs[_R7] = kernel_regs->ARM_r7;
- gdb_regs[_R8] = kernel_regs->ARM_r8;
- gdb_regs[_R9] = kernel_regs->ARM_r9;
- gdb_regs[_R10] = kernel_regs->ARM_r10;
- gdb_regs[_FP] = kernel_regs->ARM_fp;
- gdb_regs[_IP] = kernel_regs->ARM_ip;
- gdb_regs[_SPT] = kernel_regs->ARM_sp;
- gdb_regs[_LR] = kernel_regs->ARM_lr;
- gdb_regs[_PC] = kernel_regs->ARM_pc;
- gdb_regs[_CPSR] = kernel_regs->ARM_cpsr;
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return NULL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+ dbg_reg_def[regno].size);
+ else
+ memset(mem, 0, dbg_reg_def[regno].size);
+ return dbg_reg_def[regno].name;
}

-/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
- kernel_regs->ARM_r0 = gdb_regs[_R0];
- kernel_regs->ARM_r1 = gdb_regs[_R1];
- kernel_regs->ARM_r2 = gdb_regs[_R2];
- kernel_regs->ARM_r3 = gdb_regs[_R3];
- kernel_regs->ARM_r4 = gdb_regs[_R4];
- kernel_regs->ARM_r5 = gdb_regs[_R5];
- kernel_regs->ARM_r6 = gdb_regs[_R6];
- kernel_regs->ARM_r7 = gdb_regs[_R7];
- kernel_regs->ARM_r8 = gdb_regs[_R8];
- kernel_regs->ARM_r9 = gdb_regs[_R9];
- kernel_regs->ARM_r10 = gdb_regs[_R10];
- kernel_regs->ARM_fp = gdb_regs[_FP];
- kernel_regs->ARM_ip = gdb_regs[_IP];
- kernel_regs->ARM_sp = gdb_regs[_SPT];
- kernel_regs->ARM_lr = gdb_regs[_LR];
- kernel_regs->ARM_pc = gdb_regs[_PC];
- kernel_regs->ARM_cpsr = gdb_regs[_CPSR];
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return -EINVAL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+ dbg_reg_def[regno].size);
+ return 0;
}

void
--
1.6.4.rc1


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