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implement C ABI lowering for CSKY

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This commit is contained in:
dirreke 2023-10-25 20:47:06 +08:00
parent 2e4e2a8f28
commit 32339f8e80
2 changed files with 38 additions and 10 deletions
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38
compiler/rustc_target/src/abi/call/csky.rs
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@ -1,17 +1,39 @@
// See https://github.com/llvm/llvm-project/blob/d85b94bf0080dcd780656c0f5e6342800720eba9/llvm/lib/Target/CSKY/CSKYCallingConv.td
use crate::abi::call::{ArgAbi, FnAbi};
// Reference: CSKY ABI Manual
// https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1695027452256/T-HEAD_800_Series_ABI_Standards_Manual.pdf
//
// Reference: Clang CSKY lowering code
// https://github.com/llvm/llvm-project/blob/4a074f32a6914f2a8d7215d78758c24942dddc3d/clang/lib/CodeGen/Targets/CSKY.cpp#L76-L162
fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
if ret.layout.is_aggregate() || ret.layout.size.bits() > 64 {
ret.make_indirect();
use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform};
fn classify_ret<Ty>(arg: &mut ArgAbi<'_, Ty>) {
// For return type, aggregate which <= 2*XLen will be returned in registers.
// Otherwise, aggregate will be returned indirectly.
if arg.layout.is_aggregate() {
let total = arg.layout.size;
if total.bits() > 64 {
arg.make_indirect();
} else if total.bits() > 32 {
arg.cast_to(Uniform { unit: Reg::i32(), total });
} else {
arg.cast_to(Reg::i32());
}
} else {
ret.extend_integer_width_to(32);
arg.extend_integer_width_to(32);
}
}
fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) {
if arg.layout.is_aggregate() || arg.layout.size.bits() > 64 {
arg.make_indirect();
// For argument type, the first 4*XLen parts of aggregate will be passed
// in registers, and the rest will be passed in stack.
// So we can coerce to integers directly and let backend handle it correctly.
if arg.layout.is_aggregate() {
let total = arg.layout.size;
if total.bits() > 32 {
arg.cast_to(Uniform { unit: Reg::i32(), total });
} else {
arg.cast_to(Reg::i32());
}
} else {
arg.extend_integer_width_to(32);
}

10
src/doc/rustc/src/platform-support/csky-unknown-linux-gnuabiv2.md
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@ -10,9 +10,15 @@ target | std | host | notes
`csky-unknown-linux-gnuabiv2hf` | ✓ | | C-SKY abiv2 Linux, hardfloat (little endian)
Reference:
https://c-sky.github.io/
https://gitlab.com/c-sky/
- [CSKY ABI Manual](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1695027452256/T-HEAD_800_Series_ABI_Standards_Manual.pdf)
- [csky-linux-gnuabiv2-toolchain](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource/1356021/1619528643136/csky-linux-gnuabiv2-tools-x86_64-glibc-linux-4.9.56-20210423.tar.gz)
- [csky-linux-gnuabiv2-qemu](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1689324918932/xuantie-qemu-x86_64-Ubuntu-18.04-20230714-0202.tar.gz)
other links:
- https://c-sky.github.io/
- https://gitlab.com/c-sky/
## Target maintainers