sh: kgdb: Individual register get/set support.

This updates sh following the generic kgdb changes adding support
for individual register get/set for kgdb/kdb use.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 47 insertions, 23 deletions

diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index 93458880acad..d25b5ed68b24 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -1,7 +1,7 @@
 /*
  * SuperH KGDB support
  *
- * Copyright (C) 2008 - 2009  Paul Mundt
+ * Copyright (C) 2008 - 2012  Paul Mundt
  *
  * Single stepping taken from the old stub by Henry Bell and Jeremy Siegel.
  *
@@ -164,36 +164,60 @@ static void undo_single_step(struct pt_regs *linux_regs)
         stepped_opcode = 0;
 }
 
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-        int i;
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
+        { "r0",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[0]) },
+        { "r1",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[1]) },
+        { "r2",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[2]) },
+        { "r3",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[3]) },
+        { "r4",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[4]) },
+        { "r5",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[5]) },
+        { "r6",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[6]) },
+        { "r7",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[7]) },
+        { "r8",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[8]) },
+        { "r9",         GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[9]) },
+        { "r10",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[10]) },
+        { "r11",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[11]) },
+        { "r12",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[12]) },
+        { "r13",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[13]) },
+        { "r14",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[14]) },
+        { "r15",        GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[15]) },
+        { "pc",         GDB_SIZEOF_REG, offsetof(struct pt_regs, pc) },
+        { "pr",         GDB_SIZEOF_REG, offsetof(struct pt_regs, pr) },
+        { "sr",         GDB_SIZEOF_REG, offsetof(struct pt_regs, sr) },
+        { "gbr",        GDB_SIZEOF_REG, offsetof(struct pt_regs, gbr) },
+        { "mach",       GDB_SIZEOF_REG, offsetof(struct pt_regs, mach) },
+        { "macl",       GDB_SIZEOF_REG, offsetof(struct pt_regs, macl) },
+        { "vbr",        GDB_SIZEOF_REG, -1 },
+};
 
-        for (i = 0; i < 16; i++)
-                gdb_regs[GDB_R0 + i] = regs->regs[i];
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+        if (regno < 0 || regno >= DBG_MAX_REG_NUM)
+                return -EINVAL;
 
-        gdb_regs[GDB_PC] = regs->pc;
-        gdb_regs[GDB_PR] = regs->pr;
-        gdb_regs[GDB_SR] = regs->sr;
-        gdb_regs[GDB_GBR] = regs->gbr;
-        gdb_regs[GDB_MACH] = regs->mach;
-        gdb_regs[GDB_MACL] = regs->macl;
+        if (dbg_reg_def[regno].offset != -1)
+                memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+                       dbg_reg_def[regno].size);
 
-        __asm__ __volatile__ ("stc vbr, %0" : "=r" (gdb_regs[GDB_VBR]));
+        return 0;
 }
 
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
 {
-        int i;
+        if (regno >= DBG_MAX_REG_NUM || regno < 0)
+                return NULL;
 
-        for (i = 0; i < 16; i++)
-                regs->regs[GDB_R0 + i] = gdb_regs[GDB_R0 + i];
+        if (dbg_reg_def[regno].size != -1)
+                memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+                       dbg_reg_def[regno].size);
+
+        switch (regno) {
+        case GDB_VBR:
+                __asm__ __volatile__ ("stc vbr, %0" : "=r" (mem));
+                break;
+        }
 
-        regs->pc = gdb_regs[GDB_PC];
-        regs->pr = gdb_regs[GDB_PR];
-        regs->sr = gdb_regs[GDB_SR];
-        regs->gbr = gdb_regs[GDB_GBR];
-        regs->mach = gdb_regs[GDB_MACH];
-        regs->macl = gdb_regs[GDB_MACL];
+        return dbg_reg_def[regno].name;
 }
 
 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)