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std: add cbe hacks to more targets

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These are needed because clang doesn't support anything in naked
functions, not even assembly register inputs.
This commit is contained in:
Jacob Young 2022-10-23 13:21:39 -04:00
parent 1bab854868
commit 15df64ade8
8 changed files with 80 additions and 36 deletions
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19
lib/std/os/linux/arm64.zig
View File

@ -106,11 +106,20 @@ pub extern fn clone(func: CloneFn, stack: usize, flags: u32, arg: usize, ptid: *
pub const restore = restore_rt;
pub fn restore_rt() callconv(.Naked) void {
return asm volatile ("svc #0"
:
: [number] "{x8}" (@enumToInt(SYS.rt_sigreturn)),
: "memory", "cc"
);
switch (@import("builtin").zig_backend) {
.stage2_c => return asm volatile (
\\ mov x8, %[number]
\\ svc #0
:
: [number] "i" (@enumToInt(SYS.rt_sigreturn)),
: "memory", "cc"
),
else => return asm volatile ("svc #0"
:
: [number] "{x8}" (@enumToInt(SYS.rt_sigreturn)),
: "memory", "cc"
),
}
}
pub const O = struct {

38
lib/std/os/linux/i386.zig
View File

@ -124,19 +124,37 @@ const CloneFn = std.meta.FnPtr(fn (arg: usize) callconv(.C) u8);
pub extern fn clone(func: CloneFn, stack: usize, flags: u32, arg: usize, ptid: *i32, tls: usize, ctid: *i32) usize;
pub fn restore() callconv(.Naked) void {
return asm volatile ("int $0x80"
:
: [number] "{eax}" (@enumToInt(SYS.sigreturn)),
: "memory"
);
switch (@import("builtin").zig_backend) {
.stage2_c => return asm volatile (
\\ movl %[number], %%eax
\\ int $0x80
:
: [number] "i" (@enumToInt(SYS.sigreturn)),
: "memory"
),
else => return asm volatile ("int $0x80"
:
: [number] "{eax}" (@enumToInt(SYS.sigreturn)),
: "memory"
),
}
}
pub fn restore_rt() callconv(.Naked) void {
return asm volatile ("int $0x80"
:
: [number] "{eax}" (@enumToInt(SYS.rt_sigreturn)),
: "memory"
);
switch (@import("builtin").zig_backend) {
.stage2_c => return asm volatile (
\\ movl %[number], %%eax
\\ int $0x80
:
: [number] "i" (@enumToInt(SYS.rt_sigreturn)),
: "memory"
),
else => return asm volatile ("int $0x80"
:
: [number] "{eax}" (@enumToInt(SYS.rt_sigreturn)),
: "memory"
),
}
}
pub const O = struct {

13
lib/std/os/linux/x86_64.zig
View File

@ -109,11 +109,14 @@ pub const restore = restore_rt;
pub fn restore_rt() callconv(.Naked) void {
switch (@import("builtin").zig_backend) {
.stage2_c => return asm volatile (std.fmt.comptimePrint(
\\ movl ${d}, %%eax
\\ syscall
\\ retq
, .{@enumToInt(SYS.rt_sigreturn)}) ::: "rcx", "r11", "memory"),
.stage2_c => return asm volatile (
\\ movl %[number], %%eax
\\ syscall
\\ retq
:
: [number] "i" (@enumToInt(SYS.rt_sigreturn)),
: "rcx", "r11", "memory"
),
else => return asm volatile ("syscall"
:
: [number] "{rax}" (@enumToInt(SYS.rt_sigreturn)),

38
lib/std/start.zig
View File

@ -265,23 +265,37 @@ fn EfiMain(handle: uefi.Handle, system_table: *uefi.tables.SystemTable) callconv
fn _start() callconv(.Naked) noreturn {
switch (builtin.zig_backend) {
.stage2_c => switch (native_arch) {
.x86_64 => {
@export(argc_argv_ptr, .{ .name = "argc_argv_ptr" });
@export(posixCallMainAndExit, .{ .name = "_posixCallMainAndExit" });
asm volatile (
\\ xor %%rbp, %%rbp
\\ mov %%rsp, argc_argv_ptr
.stage2_c => {
@export(argc_argv_ptr, .{ .name = "argc_argv_ptr" });
@export(posixCallMainAndExit, .{ .name = "_posixCallMainAndExit" });
switch (native_arch) {
.x86_64 => asm volatile (
\\ xorl %%ebp, %%ebp
\\ movq %%rsp, argc_argv_ptr
\\ andq $-16, %%rsp
\\ call _posixCallMainAndExit
);
unreachable;
},
else => @compileError("unsupported arch"),
),
.i386 => asm volatile (
\\ xorl %%ebp, %%ebp
\\ movl %%esp, argc_argv_ptr
\\ andl $-16, %%esp
\\ jmp _posixCallMainAndExit
),
.aarch64, .aarch64_be, .arm, .armeb, .thumb => asm volatile (
\\ mov fp, #0
\\ mov lr, #0
\\ str sp, argc_argv_ptr
\\ and sp, #-16
\\ b _posixCallMainAndExit
),
else => @compileError("unsupported arch"),
}
unreachable;
},
else => switch (native_arch) {
.x86_64 => {
argc_argv_ptr = asm volatile (
\\ xor %%rbp, %%rbp
\\ xor %%ebp, %%ebp
: [argc] "={rsp}" (-> [*]usize),
);
},

2
test/cases/aarch64-macos/hello_world_with_updates.0.zig
View File

@ -2,4 +2,4 @@
// output_mode=Exe
// target=aarch64-macos
//
// :109:9: error: root struct of file 'tmp' has no member named 'main'
// :108:9: error: root struct of file 'tmp' has no member named 'main'

2
test/cases/x86_64-linux/hello_world_with_updates.0.zig
View File

@ -2,4 +2,4 @@
// output_mode=Exe
// target=x86_64-linux
//
// :109:9: error: root struct of file 'tmp' has no member named 'main'
// :108:9: error: root struct of file 'tmp' has no member named 'main'

2
test/cases/x86_64-macos/hello_world_with_updates.0.zig
View File

@ -2,4 +2,4 @@
// output_mode=Exe
// target=x86_64-macos
//
// :109:9: error: root struct of file 'tmp' has no member named 'main'
// :108:9: error: root struct of file 'tmp' has no member named 'main'

2
test/cases/x86_64-windows/hello_world_with_updates.0.zig
View File

@ -2,4 +2,4 @@
// output_mode=Exe
// target=x86_64-windows
//
// :130:9: error: root struct of file 'tmp' has no member named 'main'
// :129:9: error: root struct of file 'tmp' has no member named 'main'