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gdbstub: Add syscall entry/return hooks

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The upcoming syscall catchpoint support needs to get control on syscall
entry and return. Provide the necessary hooks for that, which are
no-ops for now.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240202152506.279476-4-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240207163812.3231697-13-alex.bennee@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2024-02-07 16:38:10 +00:00 committed by Alex Bennée
parent 8b7fcb8ed1
commit 0a0d87c9b8
3 changed files with 26 additions and 2 deletions
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8
gdbstub/user.c
View File

@ -502,3 +502,11 @@ void gdb_syscall_handling(const char *syscall_packet)
gdb_put_packet(syscall_packet);
gdb_handlesig(gdbserver_state.c_cpu, 0);
}
void gdb_syscall_entry(CPUState *cs, int num)
{
}
void gdb_syscall_return(CPUState *cs, int num)
{
}

13
include/gdbstub/user.h
View File

@ -51,5 +51,18 @@ void gdb_signalled(CPUArchState *as, int sig);
*/
void gdbserver_fork(CPUState *cs);
/**
* gdb_syscall_entry() - inform gdb of syscall entry and yield control to it
* @cs: CPU
* @num: syscall number
*/
void gdb_syscall_entry(CPUState *cs, int num);
/**
* gdb_syscall_entry() - inform gdb of syscall return and yield control to it
* @cs: CPU
* @num: syscall number
*/
void gdb_syscall_return(CPUState *cs, int num);
#endif /* GDBSTUB_USER_H */

7
include/user/syscall-trace.h
View File

@ -11,6 +11,7 @@
#define SYSCALL_TRACE_H
#include "exec/user/abitypes.h"
#include "gdbstub/user.h"
#include "qemu/plugin.h"
#include "trace/trace-root.h"
@ -20,7 +21,7 @@
* could potentially unify the -strace code here as well.
*/
static inline void record_syscall_start(void *cpu, int num,
static inline void record_syscall_start(CPUState *cpu, int num,
abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4,
abi_long arg5, abi_long arg6,
@ -29,11 +30,13 @@ static inline void record_syscall_start(void *cpu, int num,
qemu_plugin_vcpu_syscall(cpu, num,
arg1, arg2, arg3, arg4,
arg5, arg6, arg7, arg8);
gdb_syscall_entry(cpu, num);
}
static inline void record_syscall_return(void *cpu, int num, abi_long ret)
static inline void record_syscall_return(CPUState *cpu, int num, abi_long ret)
{
qemu_plugin_vcpu_syscall_ret(cpu, num, ret);
gdb_syscall_return(cpu, num);
}