| author |  Koakuma <koachan@protonmail.com> 2020-11-27 23:02:22+07:00 |
| committer | Koakuma <koachan@protonmail.com> 2020-11-27 23:02:22+07:00 |
| log | 41c40f4bbec35ac260b6a7af6b0db0dafccb56ca |
| tree | 4ae6c1d7792ff784beea71c863bd176a1fe93144 |
| parent | cf2ee4ae2c6608261e849f0d75209669d435624c |
Fix fork() on Linux/sparc64
fork() on Linux/sparc64 seems to return its result in two registers,
with %o0 always holding the current process' PID, and the parent/child
status returned in %o1. Add some glue code to convert those into
the libc-style return value.2 files changed, 20 insertions(+), 1 deletions(-)
lib- std
- os
- linux.zig
- linux
lib/std/os/linux.zig+3-1
| ... | ... | @@ -112,7 +112,9 @@ pub fn execve(path: [*:0]const u8, argv: [*:null]const ?[*:0]const u8, envp: [*: |
| 112 | 112 | } |
| 113 | 113 | |
| 114 | 114 | pub fn fork() usize { |
| 115 | if (@hasField(SYS, "fork")) { | |
| 115 | if (comptime builtin.arch.isSPARC()) { | |
| 116 | return syscall_fork(); | |
| 117 | } else if (@hasField(SYS, "fork")) { | |
| 116 | 118 | return syscall0(.fork); |
| 117 | 119 | } else { |
| 118 | 120 | return syscall2(.clone, SIGCHLD, 0); |
lib/std/os/linux/sparc64.zig+17
| ... | ... | @@ -21,6 +21,23 @@ pub fn syscall_pipe(fd: *[2]i32) usize { |
| 21 | 21 | ); |
| 22 | 22 | } |
| 23 | 23 | |
| 24 | pub fn syscall_fork() usize { | |
| 25 | return asm volatile ( | |
| 26 | \\ t 0x6d | |
| 27 | \\ bcc,pt %%xcc, 1f | |
| 28 | \\ nop | |
| 29 | \\ ba 2f | |
| 30 | \\ neg %%o0 | |
| 31 | \\ 1: | |
| 32 | \\ dec %%o1 | |
| 33 | \\ and %%o1, %%o0, %%o0 | |
| 34 | \\ 2: | |
| 35 | : [ret] "={o0}" (-> usize) | |
| 36 | : [number] "{g1}" (@enumToInt(SYS.fork)) | |
| 37 | : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7" | |
| 38 | ); | |
| 39 | } | |
| 40 | ||
| 24 | 41 | pub fn syscall0(number: SYS) usize { |
| 25 | 42 | return asm volatile ( |
| 26 | 43 | \\ t 0x6d |