diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-11-23 15:18:49 +0100 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-12-20 10:12:29 -0800 |
| commit | 5bfd125ec8ba8aab04f3a636dcea39f6c4075ced (patch) | |
| tree | 2b82a29e6883f6ec6866434f79979d46cfeeb399 /common-user/host/i386 | |
| parent | bbf15aaf7c7506c88062288b3ae122b882f65e69 (diff) | |
common-user: Adjust system call return on FreeBSD
FreeBSD system calls return positive errno. On the 4 hosts for
which we have support, error is indicated by the C bit set or clear.
Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'common-user/host/i386')
| -rw-r--r-- | common-user/host/i386/safe-syscall.inc.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/common-user/host/i386/safe-syscall.inc.S b/common-user/host/i386/safe-syscall.inc.S index aced8c5141..baf5400a29 100644 --- a/common-user/host/i386/safe-syscall.inc.S +++ b/common-user/host/i386/safe-syscall.inc.S @@ -71,9 +71,18 @@ safe_syscall_start: mov 8+16(%esp), %eax /* syscall number */ int $0x80 safe_syscall_end: + /* code path for having successfully executed the syscall */ +#if defined(__linux__) + /* Linux kernel returns (small) negative errno. */ cmp $-4095, %eax jae 0f +#elif defined(__FreeBSD__) + /* FreeBSD kernel returns positive errno and C bit set. */ + jc 1f +#else +#error "unsupported os" +#endif pop %ebx .cfi_remember_state .cfi_adjust_cfa_offset -4 @@ -90,8 +99,10 @@ safe_syscall_end: ret .cfi_restore_state +#if defined(__linux__) 0: neg %eax jmp 1f +#endif /* code path when we didn't execute the syscall */ 2: mov $QEMU_ERESTARTSYS, %eax |