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riscv workarounds for llvm not having good asm integration

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This commit is contained in:
Andrew Kelley 2019-07-18 15:20:58 -04:00
parent a3854d042e
commit 03a3b1ca39
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GPG Key ID: 7C5F548F728501A9
4 changed files with 99 additions and 44 deletions
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4
src/codegen.cpp
View File

@ -8148,6 +8148,10 @@ static void init(CodeGen *g) {
target_specific_cpu_args = ZigLLVMGetHostCPUName();
target_specific_features = ZigLLVMGetNativeFeatures();
}
} else if (target_is_riscv(g->zig_target)) {
// TODO https://github.com/ziglang/zig/issues/2883
target_specific_cpu_args = "";
target_specific_features = "+a";
} else {
target_specific_cpu_args = "";
target_specific_features = "";

132
std/os/linux/riscv64.zig
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@ -1,58 +1,96 @@
pub fn syscall0(number: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number)
return asm volatile (
\\ mv a7, %[number]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number)
: "memory"
);
}
pub fn syscall1(number: usize, arg1: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1)
: "memory"
);
}
pub fn syscall2(number: usize, arg1: usize, arg2: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1),
[arg2] "{a1}" (arg2)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ mv a1, %[arg2]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1),
[arg2] "r" (arg2)
: "memory"
);
}
pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1),
[arg2] "{a1}" (arg2),
[arg3] "{a2}" (arg3)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ mv a1, %[arg2]
\\ mv a2, %[arg3]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1),
[arg2] "r" (arg2),
[arg3] "r" (arg3)
: "memory"
);
}
pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1),
[arg2] "{a1}" (arg2),
[arg3] "{a2}" (arg3),
[arg4] "{a3}" (arg4)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ mv a1, %[arg2]
\\ mv a2, %[arg3]
\\ mv a3, %[arg4]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1),
[arg2] "r" (arg2),
[arg3] "r" (arg3),
[arg4] "r" (arg4)
: "memory"
);
}
pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1),
[arg2] "{a1}" (arg2),
[arg3] "{a2}" (arg3),
[arg4] "{a3}" (arg4),
[arg5] "{a4}" (arg5)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ mv a1, %[arg2]
\\ mv a2, %[arg3]
\\ mv a3, %[arg4]
\\ mv a4, %[arg5]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1),
[arg2] "r" (arg2),
[arg3] "r" (arg3),
[arg4] "r" (arg4),
[arg5] "r" (arg5)
: "memory"
);
}
@ -65,14 +103,24 @@ pub fn syscall6(
arg5: usize,
arg6: usize,
) usize {
return asm volatile ("ecall"
: [ret] "={a0}" (-> usize)
: [number] "{a7}" (number),
[arg1] "{a0}" (arg1),
[arg2] "{a1}" (arg2),
[arg3] "{a2}" (arg3),
[arg4] "{a3}" (arg4),
[arg5] "{a4}" (arg5),
[arg6] "{a5}" (arg6)
return asm volatile (
\\ mv a7, %[number]
\\ mv a0, %[arg1]
\\ mv a1, %[arg2]
\\ mv a2, %[arg3]
\\ mv a3, %[arg4]
\\ mv a4, %[arg5]
\\ mv a5, %[arg6]
\\ ecall
\\ mv %[ret], a0
: [ret] "=r" (-> usize)
: [number] "r" (number),
[arg1] "r" (arg1),
[arg2] "r" (arg2),
[arg3] "r" (arg3),
[arg4] "r" (arg4),
[arg5] "r" (arg5),
[arg6] "r" (arg6)
: "memory"
);
}

5
std/special/c.zig
View File

@ -180,7 +180,10 @@ comptime {
@export("__stack_chk_fail", __stack_chk_fail, builtin.GlobalLinkage.Strong);
}
if (builtin.os == builtin.Os.linux) {
@export("clone", clone, builtin.GlobalLinkage.Strong);
// TODO implement clone for riscv64
if (builtin.arch != .riscv64) {
@export("clone", clone, builtin.GlobalLinkage.Strong);
}
}
}
extern fn __stack_chk_fail() noreturn {

2
std/special/start.zig
View File

@ -60,7 +60,7 @@ nakedcc fn _start() noreturn {
);
},
.riscv64 => {
argc_ptr = asm ("mov %[argc], sp"
argc_ptr = asm ("mv %[argc], sp"
: [argc] "=r" (-> [*]usize)
);
},