[PATCH v2 12/14] gdbstub: Add syscall entry/return hooks

From: Ilya Leoshkevich <iii(a)linux.ibm.com&gt; 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(a)linux.ibm.com&gt; Message-Id: <20240202152506.279476-4-iii(a)linux.ibm.com&gt; Signed-off-by: Alex Bennée <alex.bennee(a)linaro.org&gt; --- include/gdbstub/user.h | 13 +++++++++++++ include/user/syscall-trace.h | 7 +++++-- gdbstub/user.c | 8 ++++++++ 3 files changed, 26 insertions(+), 2 deletions(-) diff --git a/include/gdbstub/user.h b/include/gdbstub/user.h index 1fc43e04af5..68b6534130c 100644 --- a/include/gdbstub/user.h +++ b/include/gdbstub/user.h @@ -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 */ diff --git a/include/user/syscall-trace.h b/include/user/syscall-trace.h index 557f881a79b..b48b2b2d0ae 100644 --- a/include/user/syscall-trace.h +++ b/include/user/syscall-trace.h @@ -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); } diff --git a/gdbstub/user.c b/gdbstub/user.c index 63edca131ab..2ba01c17faf 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -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) +{ +} -- 2.39.2