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10 Commits

Author SHA1 Message Date
wanglei
2cf420d5b8 [LoongArch] Emit function call code sequence as PCADDU18I+JIRL in medium code model 
According to the description of the psABI v2.20:
https://github.com/loongson/la-abi-specs/releases/tag/v2.20, adjustments
are made to the function call instructions under the medium code model.

At the same time, AsmParser has already supported parsing the call36 and
tail36 macro instructions.
 2024-01-05 10:56:47 +08:00
Jinyang He
f5bfc833fc
[LoongArch] Add relax feature and keep relocations (#72191) 
Add relax feature. To support linker relocation, we should make
relocation with a symbol rather than section plus offset, and keep all
relocations with non-abs symbol.
 2023-11-16 11:01:26 +08:00
Weining Lu
42cb3c6346 [LoongArch] Emit R_LARCH_64_PCREL relocation for FK_Data_8 when IsPCRel is true 
Reviewed By: xen0n, MaskRay, hev

Differential Revision: https://reviews.llvm.org/D153872
 2023-06-29 11:16:54 +08:00
Youling Tang
b18cdeac79 [MC][LoongArch] Fix needsRelocateWithSymbol() implementation 
LoongArch should be `section plus offset`, so use the generic implementation
of `llvm/lib/MC/MCELFObjectTargetWriter.cpp` to return `false` directly, like
x86 and aarch64.

```
$ cat test.c
static int __attribute__((section(".text.another"))) test(int a, int b)
{
	return a + b;
}
static int a = 1, b = 2;

int foo()
{
	test(a, b);
	return 0;
}

$ gcc -c test.c
$ readelf -Wr test.o

Relocation section '.rela.text' at offset 0x2a0 contains 5 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
0000000000000010  0000000300000047 R_LARCH_PCALA_HI20     0000000000000000 .data + 0
0000000000000014  0000000300000048 R_LARCH_PCALA_LO12     0000000000000000 .data + 0
0000000000000018  0000000300000047 R_LARCH_PCALA_HI20     0000000000000000 .data + 4
000000000000001c  0000000300000048 R_LARCH_PCALA_LO12     0000000000000000 .data + 4
0000000000000028  0000000500000042 R_LARCH_B26            0000000000000000 .text.another + 0

Relocation section '.rela.eh_frame' at offset 0x318 contains 2 entries:
    Offset             Info             Type               Symbol's Value  Symbol's Name + Addend
000000000000001c  0000000500000063 R_LARCH_32_PCREL       0000000000000000 .text.another + 0
000000000000003c  0000000200000063 R_LARCH_32_PCREL       0000000000000000 .text + 0
```

Reviewed By: SixWeining, MaskRay

Differential Revision: https://reviews.llvm.org/D137384
 2022-11-16 15:52:30 +08:00
wanglei
036b170c24 [LoongArch] Produce a R_LARCH_32_PCREL relocation 
LoongArchELFObjectWriter::getRelocType check IsPCRel for FK_Data_4
(which we produce a R_LARCH_32_PCREL relocation for if IsPCRel).

R_LARCH_32_PCREL is required for FDE relocation.

Differential Revision: https://reviews.llvm.org/D134715
 2022-09-29 09:04:44 +08:00
wanglei
bf47954703 [LoongArch] Add more fixups and relocations 
This patch makes the assembler support all modifiers defined in gnu-as.
Also changes some diagnostic information.

Differential Revision: https://reviews.llvm.org/D132633
 2022-09-05 14:55:18 +08:00
wanglei
c2ee21cf3f [LoongArch] Add some fixups and relocations 
This patch only add %pc_hi20/%pc_lo12/%plt relocations in order
to be able to generate gnu ld linkable relocation file for the
`hello world` IR :
```
@.str = private unnamed_addr constant [14 x i8] c"Hello world!\0A\00", align 1

define dso_local signext i32 @main() nounwind {
entry:
  %call = call signext i32 (ptr, ...) @printf(ptr noundef @.str)
  ret i32 0
}

declare dso_local signext i32 @printf(ptr noundef, ...)
```

This patch also updates some test cases due to new modifiers introduced.
New test: test/MC/LoongArch/Relocations/relocations.s

Differential Revision: https://reviews.llvm.org/D132108
 2022-08-20 11:19:24 +08:00
Weining Lu
904a87ace3 [LoongArch] Use end namespace xxx style comment. NFC 2022-07-26 15:01:29 +08:00
Fangrui Song
88436afe30 [LoongArch] Fix several Clang warnings. NFC 2022-03-25 22:15:35 -07:00
Lu Weining
33388ae866 [LoongArch 4/6] Add basic tablegen infra for LoongArch 
This patch introduces basic tablegen infra such as
LoongArch{InstrFormats,InstrInfo,RegisterInfo,CallingConv,}.td.

For now, only add instruction definitions for LoongArch basic integer
operations.
Our initial target is a working MC layer rather than codegen,
so appropriate SelectionDAG patterns will come later.

Differential revision: https://reviews.llvm.org/D115861
 2022-02-10 10:23:34 +00:00