kgdb,ppc: Individual register get/set for ppc

commit 534af1082329392bc29f6badf815e69ae2ae0f4c(kgdb,kdb: individual
register set and and get API) introduce dbg_get_reg/dbg_set_reg API
for individual register get and set.

This patch implement those APIs for ppc.

Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

2 files changed, 126 insertions, 63 deletions

diff --git a/arch/powerpc/include/asm/kgdb.h b/arch/powerpc/include/asm/kgdb.h
index edd217006d27..9db24e77b9f4 100644
--- a/arch/powerpc/include/asm/kgdb.h
+++ b/arch/powerpc/include/asm/kgdb.h
@@ -31,6 +31,7 @@ static inline void arch_kgdb_breakpoint(void)
         asm(".long 0x7d821008"); /* twge r2, r2 */
 }
 #define CACHE_FLUSH_IS_SAFE     1
+#define DBG_MAX_REG_NUM     70
 
 /* The number bytes of registers we have to save depends on a few
  * things.  For 64bit we default to not including vector registers and
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 7f61a3ac787c..7a9db64f3f04 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -194,40 +194,6 @@ static int kgdb_dabr_match(struct pt_regs *regs)
         ptr = (unsigned long *)ptr32; \
         } while (0)
 
-
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-        unsigned long *ptr = gdb_regs;
-        int reg;
-
-        memset(gdb_regs, 0, NUMREGBYTES);
-
-        for (reg = 0; reg < 32; reg++)
-                PACK64(ptr, regs->gpr[reg]);
-
-#ifdef CONFIG_FSL_BOOKE
-#ifdef CONFIG_SPE
-        for (reg = 0; reg < 32; reg++)
-                PACK64(ptr, current->thread.evr[reg]);
-#else
-        ptr += 32;
-#endif
-#else
-        /* fp registers not used by kernel, leave zero */
-        ptr += 32 * 8 / sizeof(long);
-#endif
-
-        PACK64(ptr, regs->nip);
-        PACK64(ptr, regs->msr);
-        PACK32(ptr, regs->ccr);
-        PACK64(ptr, regs->link);
-        PACK64(ptr, regs->ctr);
-        PACK32(ptr, regs->xer);
-
-        BUG_ON((unsigned long)ptr >
-               (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
-}
-
 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 {
         struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
@@ -271,44 +237,140 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
                (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
 }
 
-#define UNPACK64(dest, ptr) do { dest = *(ptr++); } while (0)
+#define GDB_SIZEOF_REG sizeof(unsigned long)
+#define GDB_SIZEOF_REG_U32 sizeof(u32)
 
-#define UNPACK32(dest, ptr) do {       \
-        u32 *ptr32;                   \
-        ptr32 = (u32 *)ptr;           \
-        dest = *(ptr32++);            \
-        ptr = (unsigned long *)ptr32; \
-        } while (0)
+#ifdef CONFIG_FSL_BOOKE
+#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
+#else
+#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
+#endif
 
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
 {
-        unsigned long *ptr = gdb_regs;
-        int reg;
-
-        for (reg = 0; reg < 32; reg++)
-                UNPACK64(regs->gpr[reg], ptr);
+        { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
+        { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
+        { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
+        { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
+        { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
+        { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
+        { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
+        { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
+        { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
+        { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
+        { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
+        { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
+        { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
+        { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
+        { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
+        { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
+        { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
+        { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
+        { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
+        { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
+        { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
+        { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
+        { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
+        { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
+        { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
+        { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
+        { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
+        { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
+        { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
+        { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
+        { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
+        { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
+
+        { "f0", GDB_SIZEOF_FLOAT_REG, 0 },
+        { "f1", GDB_SIZEOF_FLOAT_REG, 1 },
+        { "f2", GDB_SIZEOF_FLOAT_REG, 2 },
+        { "f3", GDB_SIZEOF_FLOAT_REG, 3 },
+        { "f4", GDB_SIZEOF_FLOAT_REG, 4 },
+        { "f5", GDB_SIZEOF_FLOAT_REG, 5 },
+        { "f6", GDB_SIZEOF_FLOAT_REG, 6 },
+        { "f7", GDB_SIZEOF_FLOAT_REG, 7 },
+        { "f8", GDB_SIZEOF_FLOAT_REG, 8 },
+        { "f9", GDB_SIZEOF_FLOAT_REG, 9 },
+        { "f10", GDB_SIZEOF_FLOAT_REG, 10 },
+        { "f11", GDB_SIZEOF_FLOAT_REG, 11 },
+        { "f12", GDB_SIZEOF_FLOAT_REG, 12 },
+        { "f13", GDB_SIZEOF_FLOAT_REG, 13 },
+        { "f14", GDB_SIZEOF_FLOAT_REG, 14 },
+        { "f15", GDB_SIZEOF_FLOAT_REG, 15 },
+        { "f16", GDB_SIZEOF_FLOAT_REG, 16 },
+        { "f17", GDB_SIZEOF_FLOAT_REG, 17 },
+        { "f18", GDB_SIZEOF_FLOAT_REG, 18 },
+        { "f19", GDB_SIZEOF_FLOAT_REG, 19 },
+        { "f20", GDB_SIZEOF_FLOAT_REG, 20 },
+        { "f21", GDB_SIZEOF_FLOAT_REG, 21 },
+        { "f22", GDB_SIZEOF_FLOAT_REG, 22 },
+        { "f23", GDB_SIZEOF_FLOAT_REG, 23 },
+        { "f24", GDB_SIZEOF_FLOAT_REG, 24 },
+        { "f25", GDB_SIZEOF_FLOAT_REG, 25 },
+        { "f26", GDB_SIZEOF_FLOAT_REG, 26 },
+        { "f27", GDB_SIZEOF_FLOAT_REG, 27 },
+        { "f28", GDB_SIZEOF_FLOAT_REG, 28 },
+        { "f29", GDB_SIZEOF_FLOAT_REG, 29 },
+        { "f30", GDB_SIZEOF_FLOAT_REG, 30 },
+        { "f31", GDB_SIZEOF_FLOAT_REG, 31 },
+
+        { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
+        { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
+        { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
+        { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
+        { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
+        { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
+};
 
-#ifdef CONFIG_FSL_BOOKE
-#ifdef CONFIG_SPE
-        for (reg = 0; reg < 32; reg++)
-                UNPACK64(current->thread.evr[reg], ptr);
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+        if (regno >= DBG_MAX_REG_NUM || regno < 0)
+                return NULL;
+
+        if (regno < 32 || regno >= 64)
+                /* First 0 -> 31 gpr registers*/
+                /* pc, msr, ls... registers 64 -> 69 */
+                memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+                                dbg_reg_def[regno].size);
+
+        if (regno >= 32 && regno < 64) {
+                /* FP registers 32 -> 63 */
+#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
+                if (current)
+                        memcpy(mem, current->thread.evr[regno-32],
+                                        dbg_reg_def[regno].size);
 #else
-        ptr += 32;
+                /* fp registers not used by kernel, leave zero */
+                memset(mem, 0, dbg_reg_def[regno].size);
 #endif
+        }
+
+        return dbg_reg_def[regno].name;
+}
+
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+        if (regno >= DBG_MAX_REG_NUM || regno < 0)
+                return -EINVAL;
+
+        if (regno < 32 || regno >= 64)
+                /* First 0 -> 31 gpr registers*/
+                /* pc, msr, ls... registers 64 -> 69 */
+                memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+                                dbg_reg_def[regno].size);
+
+        if (regno >= 32 && regno < 64) {
+                /* FP registers 32 -> 63 */
+#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
+                memcpy(current->thread.evr[regno-32], mem,
+                                dbg_reg_def[regno].size);
 #else
-        /* fp registers not used by kernel, leave zero */
-        ptr += 32 * 8 / sizeof(int);
+                /* fp registers not used by kernel, leave zero */
+                return 0;
 #endif
+        }
 
-        UNPACK64(regs->nip, ptr);
-        UNPACK64(regs->msr, ptr);
-        UNPACK32(regs->ccr, ptr);
-        UNPACK64(regs->link, ptr);
-        UNPACK64(regs->ctr, ptr);
-        UNPACK32(regs->xer, ptr);
-
-        BUG_ON((unsigned long)ptr >
-               (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
+        return 0;
 }
 
 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)