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[Qemu-devel] [PATCH 2/5] PPC Breakpoints for gdb-stub
From: |
Jason Wessel |
Subject: |
[Qemu-devel] [PATCH 2/5] PPC Breakpoints for gdb-stub |
Date: |
Sat, 20 May 2006 16:01:20 -0500 |
User-agent: |
Thunderbird 1.5.0.2 (Windows/20060308) |
This patch adds breakpoint and single stepping support for PPC via the
gdb stub.
signed-off-by: address@hidden
Jason.
Index: qemu/target-ppc/translate.c
===================================================================
--- qemu.orig/target-ppc/translate.c
+++ qemu/target-ppc/translate.c
@@ -148,6 +148,7 @@ typedef struct DisasContext {
#endif
int fpu_enabled;
ppc_spr_t *spr_cb; /* Needed to check rights for mfspr/mtspr */
+ int singlestep_enabled;
} DisasContext;
struct opc_handler_t {
@@ -1738,10 +1739,14 @@ static inline void gen_goto_tb(DisasCont
gen_op_set_T1(dest);
gen_op_b_T1();
gen_op_set_T0((long)tb + n);
+ if (ctx->singlestep_enabled)
+ gen_op_debug();
gen_op_exit_tb();
} else {
gen_op_set_T1(dest);
gen_op_b_T1();
+ if (ctx->singlestep_enabled)
+ gen_op_debug();
gen_op_set_T0(0);
gen_op_exit_tb();
}
@@ -2520,12 +2525,22 @@ int gen_intermediate_code_internal (CPUS
ctx.mem_idx = ((1 - msr_pr) << 1) | msr_le;
#endif
ctx.fpu_enabled = msr_fp;
+ ctx.singlestep_enabled = env->singlestep_enabled;
#if defined (DO_SINGLE_STEP) && 0
/* Single step trace mode */
msr_se = 1;
#endif
/* Set env in case of segfault during code fetch */
while (ctx.exception == EXCP_NONE && gen_opc_ptr < gen_opc_end) {
+ if (env->nb_breakpoints > 0) {
+ for(j = 0; j < env->nb_breakpoints; j++) {
+ if (env->breakpoints[j] == ctx.nip) {
+ gen_op_update_nip(ctx.nip);
+ gen_op_debug();
+ break;
+ }
+ }
+ }
if (search_pc) {
j = gen_opc_ptr - gen_opc_buf;
if (lj < j) {
@@ -2616,8 +2631,12 @@ int gen_intermediate_code_internal (CPUS
ctx.exception != EXCP_TRAP)) {
RET_EXCP(ctxp, EXCP_TRACE, 0);
}
- /* if we reach a page boundary, stop generation */
- if ((ctx.nip & (TARGET_PAGE_SIZE - 1)) == 0) {
+
+ /* if we reach a page boundary or are single stepping, stop
+ * generation
+ */
+ if (((ctx.nip & (TARGET_PAGE_SIZE - 1)) == 0) ||
+ (env->singlestep_enabled)) {
break;
}
#if defined (DO_SINGLE_STEP)
Index: qemu/target-ppc/op.c
===================================================================
--- qemu.orig/target-ppc/op.c
+++ qemu/target-ppc/op.c
@@ -204,6 +204,11 @@ PPC_OP(update_nip)
env->nip = PARAM(1);
}
+PPC_OP(debug)
+{
+ do_raise_exception(EXCP_DEBUG);
+}
+
/* Segment registers load and store with immediate index */
PPC_OP(load_srin)
{
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