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Gdbstub: Fix back-trace on SPARC32

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Gdb expects all registers windows to be flushed in ram, which is not the case
in Qemu. Therefore the back-trace generation doesn't work. This patch adds a
function to handle reads (and only read) in stack frames as if windows were
flushed.

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Fabien Chouteau 2011-09-08 12:48:16 +02:00 committed by Blue Swirl
parent 7d890b4074
commit 44520db10b
3 changed files with 104 additions and 3 deletions
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16
gdbstub.c
View File

@ -41,6 +41,15 @@
#include "qemu_socket.h"
#include "kvm.h"
#ifndef TARGET_CPU_MEMORY_RW_DEBUG
static inline int target_memory_rw_debug(CPUState *env, target_ulong addr,
uint8_t *buf, int len, int is_write)
{
return cpu_memory_rw_debug(env, addr, buf, len, is_write);
}
#else
/* target_memory_rw_debug() defined in cpu.h */
#endif
enum {
GDB_SIGNAL_0 = 0,
@ -2109,7 +2118,7 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
if (*p == ',')
p++;
len = strtoull(p, NULL, 16);
if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 0) != 0) {
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 0) != 0) {
put_packet (s, "E14");
} else {
memtohex(buf, mem_buf, len);
@ -2124,10 +2133,11 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
if (*p == ':')
p++;
hextomem(mem_buf, p, len);
if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 1) != 0)
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 1) != 0) {
put_packet(s, "E14");
else
} else {
put_packet(s, "OK");
}
break;
case 'p':
/* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.

7
target-sparc/cpu.h
View File

@ -495,6 +495,13 @@ int cpu_sparc_handle_mmu_fault(CPUSPARCState *env1, target_ulong address, int rw
target_ulong mmu_probe(CPUSPARCState *env, target_ulong address, int mmulev);
void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUState *env);
#if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
int target_memory_rw_debug(CPUState *env, target_ulong addr,
uint8_t *buf, int len, int is_write);
#define TARGET_CPU_MEMORY_RW_DEBUG
#endif
/* translate.c */
void gen_intermediate_code_init(CPUSPARCState *env);

84
target-sparc/helper.c
View File

@ -358,6 +358,90 @@ void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUState *env)
}
}
#if !defined(CONFIG_USER_ONLY)
/* Gdb expects all registers windows to be flushed in ram. This function handles
* reads (and only reads) in stack frames as if windows were flushed. We assume
* that the sparc ABI is followed.
*/
int target_memory_rw_debug(CPUState *env, target_ulong addr,
uint8_t *buf, int len, int is_write)
{
int i;
int len1;
int cwp = env->cwp;
if (!is_write) {
for (i = 0; i < env->nwindows; i++) {
int off;
target_ulong fp = env->regbase[cwp * 16 + 22];
/* Assume fp == 0 means end of frame. */
if (fp == 0) {
break;
}
cwp = cpu_cwp_inc(env, cwp + 1);
/* Invalid window ? */
if (env->wim & (1 << cwp)) {
break;
}
/* According to the ABI, the stack is growing downward. */
if (addr + len < fp) {
break;
}
/* Not in this frame. */
if (addr > fp + 64) {
continue;
}
/* Handle access before this window. */
if (addr < fp) {
len1 = fp - addr;
if (cpu_memory_rw_debug(env, addr, buf, len1, is_write) != 0) {
return -1;
}
addr += len1;
len -= len1;
buf += len1;
}
/* Access byte per byte to registers. Not very efficient but speed
* is not critical.
*/
off = addr - fp;
len1 = 64 - off;
if (len1 > len) {
len1 = len;
}
for (; len1; len1--) {
int reg = cwp * 16 + 8 + (off >> 2);
union {
uint32_t v;
uint8_t c[4];
} u;
u.v = cpu_to_be32(env->regbase[reg]);
*buf++ = u.c[off & 3];
addr++;
len--;
off++;
}
if (len == 0) {
return 0;
}
}
}
return cpu_memory_rw_debug(env, addr, buf, len, is_write);
}
#endif /* !defined(CONFIG_USER_ONLY) */
#else /* !TARGET_SPARC64 */
// 41 bit physical address space