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target/i386/gdbstub: Factor out gdb_get_reg() and gdb_write_reg() 

i386 gdbstub handles both i386 and x86_64. Factor out two functions
for reading and writing registers without knowing their bitness.

While at it, simplify the TARGET_LONG_BITS == 32 case.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20240912093012.402366-4-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2024-09-12 11:28:22 +02:00 committed by Richard Henderson
parent 3674bfadb5
commit e7a4427aec
1 changed files with 30 additions and 21 deletions
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51
target/i386/gdbstub.c
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@ -96,6 +96,19 @@ static int gdb_write_reg_cs64(uint32_t hflags, uint8_t *buf, target_ulong *val)
return 4;
}
static int gdb_get_reg(CPUX86State *env, GByteArray *mem_buf, target_ulong val)
{
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
return gdb_get_reg64(mem_buf, val);
} else {
return gdb_get_reg64(mem_buf, val & 0xffffffffUL);
}
} else {
return gdb_get_reg32(mem_buf, val);
}
}
int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{
X86CPU *cpu = X86_CPU(cs);
@ -137,15 +150,7 @@ int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
} else {
switch (n) {
case IDX_IP_REG:
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
return gdb_get_reg64(mem_buf, env->eip);
} else {
return gdb_get_reg64(mem_buf, env->eip & 0xffffffffUL);
}
} else {
return gdb_get_reg32(mem_buf, env->eip);
}
return gdb_get_reg(env, mem_buf, env->eip);
case IDX_FLAGS_REG:
return gdb_get_reg32(mem_buf, env->eflags);
@ -248,6 +253,21 @@ static int x86_cpu_gdb_load_seg(X86CPU *cpu, X86Seg sreg, uint8_t *mem_buf)
return 4;
}
static int gdb_write_reg(CPUX86State *env, uint8_t *mem_buf, target_ulong *val)
{
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
*val = ldq_p(mem_buf);
} else {
*val = ldq_p(mem_buf) & 0xffffffffUL;
}
return 8;
} else {
*val = (uint32_t)ldl_p(mem_buf);
return 4;
}
}
int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
X86CPU *cpu = X86_CPU(cs);
@ -288,18 +308,7 @@ int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
} else {
switch (n) {
case IDX_IP_REG:
if (TARGET_LONG_BITS == 64) {
if (env->hflags & HF_CS64_MASK) {
env->eip = ldq_p(mem_buf);
} else {
env->eip = ldq_p(mem_buf) & 0xffffffffUL;
}
return 8;
} else {
env->eip &= ~0xffffffffUL;
env->eip |= (uint32_t)ldl_p(mem_buf);
return 4;
}
return gdb_write_reg(env, mem_buf, &env->eip);
case IDX_FLAGS_REG:
env->eflags = ldl_p(mem_buf);
return 4;