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target/i386/gdbstub: Expose orig_ax

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Copy XML files describing orig_ax from GDB and glue them with
CPUX86State.orig_ax.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20240912093012.402366-5-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2024-09-12 11:28:23 +02:00 committed by Richard Henderson
parent e7a4427aec
commit ac2fb86a0e
7 changed files with 77 additions and 2 deletions
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2
configs/targets/i386-linux-user.mak
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@ -1,4 +1,4 @@
TARGET_ARCH=i386
TARGET_SYSTBL_ABI=i386
TARGET_SYSTBL=syscall_32.tbl
TARGET_XML_FILES= gdb-xml/i386-32bit.xml
TARGET_XML_FILES= gdb-xml/i386-32bit.xml gdb-xml/i386-32bit-linux.xml

2
configs/targets/x86_64-linux-user.mak
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@ -2,4 +2,4 @@ TARGET_ARCH=x86_64
TARGET_BASE_ARCH=i386
TARGET_SYSTBL_ABI=common,64
TARGET_SYSTBL=syscall_64.tbl
TARGET_XML_FILES= gdb-xml/i386-64bit.xml
TARGET_XML_FILES= gdb-xml/i386-64bit.xml gdb-xml/i386-64bit-linux.xml

11
gdb-xml/i386-32bit-linux.xml Normal file
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@ -0,0 +1,11 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2010-2024 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.i386.linux">
<reg name="orig_eax" bitsize="32" type="int"/>
</feature>

11
gdb-xml/i386-64bit-linux.xml Normal file
View File

@ -0,0 +1,11 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2010-2024 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.i386.linux">
<reg name="orig_rax" bitsize="64" type="int"/>
</feature>

1
target/i386/cpu.c
View File

@ -7831,6 +7831,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
mce_init(cpu);
x86_cpu_gdb_init(cs);
qemu_init_vcpu(cs);
/*

1
target/i386/cpu.h
View File

@ -2226,6 +2226,7 @@ void x86_cpu_dump_state(CPUState *cs, FILE *f, int flags);
int x86_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
int x86_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
void x86_cpu_gdb_init(CPUState *cs);
void x86_cpu_list(void);
int cpu_x86_support_mca_broadcast(CPUX86State *env);

51
target/i386/gdbstub.c
View File

@ -18,8 +18,13 @@
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "accel/tcg/vcpu-state.h"
#include "cpu.h"
#include "exec/gdbstub.h"
#include "gdbstub/helpers.h"
#ifdef CONFIG_LINUX_USER
#include "linux-user/qemu.h"
#endif
#ifdef TARGET_X86_64
static const int gpr_map[16] = {
@ -406,3 +411,49 @@ int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
/* Unrecognised register. */
return 0;
}
#ifdef CONFIG_LINUX_USER
#define IDX_ORIG_AX 0
static int x86_cpu_gdb_read_linux_register(CPUState *cs, GByteArray *mem_buf,
int n)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
switch (n) {
case IDX_ORIG_AX:
return gdb_get_reg(env, mem_buf, get_task_state(cs)->orig_ax);
}
return 0;
}
static int x86_cpu_gdb_write_linux_register(CPUState *cs, uint8_t *mem_buf,
int n)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
switch (n) {
case IDX_ORIG_AX:
return gdb_write_reg(env, mem_buf, &get_task_state(cs)->orig_ax);
}
return 0;
}
#endif
void x86_cpu_gdb_init(CPUState *cs)
{
#ifdef CONFIG_LINUX_USER
gdb_register_coprocessor(cs, x86_cpu_gdb_read_linux_register,
x86_cpu_gdb_write_linux_register,
#ifdef TARGET_X86_64
gdb_find_static_feature("i386-64bit-linux.xml"),
#else
gdb_find_static_feature("i386-32bit-linux.xml"),
#endif
0);
#endif
}