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bsd-user/freebsd/os-syscall.c: Tracing and error boilerplate 

Add in the tracing and this system call not implemented boilerplate. Do
this by moving the guts of do_freebsd_syscall to freebsd_syscall. Put
the tracing in the wrapper function. Since freebsd_syscall is a
singleton static function, it will almost certainly be inlined. Fix
comments that referred to do_syscall since that was renamed some tie
ago.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2022-01-31 13:55:12 -07:00
parent 883808d848
commit db69788703
1 changed files with 40 additions and 4 deletions
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44
bsd-user/freebsd/os-syscall.c
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@ -190,16 +190,52 @@ void unlock_iovec(struct iovec *vec, abi_ulong target_addr,
}
/*
* do_syscall() should always have a single exit point at the end so that
* actions, such as logging of syscall results, can be performed. All errnos
* that do_syscall() returns must be -TARGET_<errcode>.
* All errnos that freebsd_syscall() returns must be -TARGET_<errcode>.
*/
static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4,
abi_long arg5, abi_long arg6, abi_long arg7,
abi_long arg8)
{
abi_long ret;
switch (num) {
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
ret = -TARGET_ENOSYS;
break;
}
return ret;
}
/*
* do_freebsd_syscall() should always have a single exit point at the end so
* that actions, such as logging of syscall results, can be performed. This
* as a wrapper around freebsd_syscall() so that actually happens. Since
* that is a singleton, modern compilers will inline it anyway...
*/
abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4,
abi_long arg5, abi_long arg6, abi_long arg7,
abi_long arg8)
{
return 0;
CPUState *cpu = env_cpu(cpu_env);
int ret;
trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
if (do_strace) {
print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
}
ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6,
arg7, arg8);
if (do_strace) {
print_freebsd_syscall_ret(num, ret);
}
trace_guest_user_syscall_ret(cpu, num, ret);
return ret;
}
void syscall_init(void)