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gdbstub: Save target's siginfo

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Save target's siginfo into gdbserver_state so it can be used later, for
example, in any stub that requires the target's si_signo and si_code.

This change affects only linux-user mode.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240309030901.1726211-4-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Gustavo Romero 2024-03-09 03:08:59 +00:00 • committed by Alex Bennée
parent 4d6d8a05a0
commit f84e313e02
6 changed files with 34 additions and 9 deletions
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23
gdbstub/user.c
View file

@ -95,6 +95,8 @@ typedef struct {
enum GDBForkState fork_state;
int fork_sockets[2];
pid_t fork_peer_pid, fork_peer_tid;
uint8_t siginfo[MAX_SIGINFO_LENGTH];
unsigned long siginfo_len;
} GDBUserState;
static GDBUserState gdbserver_user_state;
@ -190,7 +192,8 @@ void gdb_qemu_exit(int code)
exit(code);
}
int gdb_handlesig(CPUState *cpu, int sig, const char *reason)
int gdb_handlesig(CPUState *cpu, int sig, const char *reason, void *siginfo,
int siginfo_len)
{
char buf[256];
int n;
@ -199,6 +202,18 @@ int gdb_handlesig(CPUState *cpu, int sig, const char *reason)
return sig;
}
if (siginfo) {
/*
* Save target-specific siginfo.
*
* siginfo size, i.e. siginfo_len, is asserted at compile-time to fit in
* gdbserver_user_state.siginfo, usually in the source file calling
* gdb_handlesig. See, for instance, {linux,bsd}-user/signal.c.
*/
memcpy(gdbserver_user_state.siginfo, siginfo, siginfo_len);
gdbserver_user_state.siginfo_len = siginfo_len;
}
/* disable single step if it was enabled */
cpu_single_step(cpu, 0);
tb_flush(cpu);
@ -746,7 +761,7 @@ void gdb_breakpoint_remove_all(CPUState *cs)
void gdb_syscall_handling(const char *syscall_packet)
{
gdb_put_packet(syscall_packet);
gdb_handlesig(gdbserver_state.c_cpu, 0, NULL);
gdb_handlesig(gdbserver_state.c_cpu, 0, NULL, NULL, 0);
}
static bool should_catch_syscall(int num)
@ -764,7 +779,7 @@ void gdb_syscall_entry(CPUState *cs, int num)
{
if (should_catch_syscall(num)) {
g_autofree char *reason = g_strdup_printf("syscall_entry:%x;", num);
gdb_handlesig(cs, gdb_target_sigtrap(), reason);
gdb_handlesig(cs, gdb_target_sigtrap(), reason, NULL, 0);
}
}
@ -772,7 +787,7 @@ void gdb_syscall_return(CPUState *cs, int num)
{
if (should_catch_syscall(num)) {
g_autofree char *reason = g_strdup_printf("syscall_return:%x;", num);
gdb_handlesig(cs, gdb_target_sigtrap(), reason);
gdb_handlesig(cs, gdb_target_sigtrap(), reason, NULL, 0);
}
}