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clone() on arm64

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This commit is contained in:
Shawn Landden 2018-08-30 02:45:10 +00:00
parent f8808edff4
commit cba0d76fbc
2 changed files with 60 additions and 28 deletions
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2
std/os/linux/arm64.zig
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@ -366,7 +366,7 @@ pub fn syscall6(
}
/// This matches the libc clone function.
pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: usize, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;
pub extern fn clone(func: extern fn (arg: usize) u8, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;
pub const msghdr = extern struct {
msg_name: *u8,

86
std/special/builtin.zig
View File

@ -60,7 +60,7 @@ comptime {
{
@export("__stack_chk_fail", __stack_chk_fail, builtin.GlobalLinkage.Strong);
}
if (builtin.os == builtin.Os.linux and builtin.arch == builtin.Arch.x86_64) {
if (builtin.os == builtin.Os.linux) {
@export("clone", clone, builtin.GlobalLinkage.Strong);
}
}
@ -72,32 +72,64 @@ extern fn __stack_chk_fail() noreturn {
// it causes a segfault in release mode. this is a workaround of calling it
// across .o file boundaries. fix comptime @ptrCast of nakedcc functions.
nakedcc fn clone() void {
asm volatile (
\\ xor %%eax,%%eax
\\ mov $56,%%al
\\ mov %%rdi,%%r11
\\ mov %%rdx,%%rdi
\\ mov %%r8,%%rdx
\\ mov %%r9,%%r8
\\ mov 8(%%rsp),%%r10
\\ mov %%r11,%%r9
\\ and $-16,%%rsi
\\ sub $8,%%rsi
\\ mov %%rcx,(%%rsi)
\\ syscall
\\ test %%eax,%%eax
\\ jnz 1f
\\ xor %%ebp,%%ebp
\\ pop %%rdi
\\ call *%%r9
\\ mov %%eax,%%edi
\\ xor %%eax,%%eax
\\ mov $60,%%al
\\ syscall
\\ hlt
\\1: ret
\\
);
if (builtin.arch == builtin.Arch.x86_64) {
asm volatile (
\\ xor %%eax,%%eax
\\ mov $56,%%al // SYS_clone
\\ mov %%rdi,%%r11
\\ mov %%rdx,%%rdi
\\ mov %%r8,%%rdx
\\ mov %%r9,%%r8
\\ mov 8(%%rsp),%%r10
\\ mov %%r11,%%r9
\\ and $-16,%%rsi
\\ sub $8,%%rsi
\\ mov %%rcx,(%%rsi)
\\ syscall
\\ test %%eax,%%eax
\\ jnz 1f
\\ xor %%ebp,%%ebp
\\ pop %%rdi
\\ call *%%r9
\\ mov %%eax,%%edi
\\ xor %%eax,%%eax
\\ mov $60,%%al // SYS_exit
\\ syscall
\\ hlt
\\1: ret
\\
);
} else if (builtin.arch == builtin.Arch.aarch64v8) {
// __clone(func, stack, flags, arg, ptid, tls, ctid)
// x0, x1, w2, x3, x4, x5, x6
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
// x8, x0, x1, x2, x3, x4
asm volatile (
\\ // align stack and save func,arg
\\ and x1,x1,#-16
\\ stp x0,x3,[x1,#-16]!
\\
\\ // syscall
\\ uxtw x0,w2
\\ mov x2,x4
\\ mov x3,x5
\\ mov x4,x6
\\ mov x8,#220 // SYS_clone
\\ svc #0
\\
\\ cbz x0,1f
\\ // parent
\\ ret
\\ // child
\\1: ldp x1,x0,[sp],#16
\\ blr x1
\\ mov x8,#93 // SYS_exit
\\ svc #0
);
} else {
@compileError("Implement clone() for this arch.");
}
}
const math = @import("../math/index.zig");