derek.holloway
7502bf64a4
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49 lines
2.3 KiB
ArmAsm
49 lines
2.3 KiB
ArmAsm
# REQUIRES: riscv
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## R_RISCV_RVC_BRANCH and R_RISCV_RVC_JUMP encode 9-bit and 12-bit signed
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## PC-relative offsets. RVC_BRANCH applies to c.beqz/c.bnez; RVC_JUMP applies
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## to c.j and (rv32-only) c.jal — different opcode bits, same imm layout.
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## Use .reloc to attach the compressed relocation; without it the assembler
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## converts a cross-section c.beqz/c.j to an extended branch sequence.
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# RUN: rm -rf %t && mkdir %t && cd %t
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# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+c %s -o a.o
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## c.beqz val=-32 = 0b111100000 : imm8, imm7_6, imm5
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## c.bnez val=+30 = 0b000011110 : imm4_3, imm2_1
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## c.j val=-128 = 0b111110000000 : imm11, imm10, imm9_8, imm7
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## c.jal val=+126 = 0b000001111110 : imm6, imm5, imm4, imm3_1 + opcode mask
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# RUN: ld.lld -Ttext=0x10000 a.o --defsym ba=_start-32 --defsym bb=_start+32 \
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# RUN: --defsym ja=_start-124 --defsym jb=_start+132
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# RUN: llvm-objdump -d -M no-aliases --no-show-raw-insn a.out | FileCheck %s
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# CHECK-LABEL: <_start>:
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# CHECK-NEXT: c.beqz a0, 0xffe0
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# CHECK-NEXT: c.bnez a0, 0x10020
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# CHECK-NEXT: c.j 0xff84
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# CHECK-NEXT: c.jal 0x10084
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## Out of range. Untouched relocations stay in range.
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# RUN: not ld.lld -Ttext=0x10000 a.o --defsym ba=_start+0x100 --defsym bb=_start \
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# RUN: --defsym ja=_start+0x804 --defsym jb=_start+6 2>&1 \
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# RUN: | FileCheck --check-prefix=RANGE %s --implicit-check-not=error:
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# RANGE: error: a.o:(.text+0x0): relocation R_RISCV_RVC_BRANCH out of range: 256 is not in [-256, 255]; references 'ba'
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# RANGE: error: a.o:(.text+0x4): relocation R_RISCV_RVC_JUMP out of range: 2048 is not in [-2048, 2047]; references 'ja'
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## Misalignment.
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# RUN: not ld.lld -Ttext=0x10000 a.o --defsym ba=_start+5 --defsym bb=_start \
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# RUN: --defsym ja=_start+5 --defsym jb=_start+6 2>&1 \
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# RUN: | FileCheck --check-prefix=ALIGN %s --implicit-check-not=error:
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# ALIGN: error: a.o:(.text+0x0): improper alignment for relocation R_RISCV_RVC_BRANCH: 0x5 is not aligned to 2 bytes
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# ALIGN: error: a.o:(.text+0x4): improper alignment for relocation R_RISCV_RVC_JUMP: 0x1 is not aligned to 2 bytes
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.option arch, +c
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.global _start
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_start:
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.reloc ., R_RISCV_RVC_BRANCH, ba
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c.beqz a0, 0
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.reloc ., R_RISCV_RVC_BRANCH, bb
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c.bnez a0, 0
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.reloc ., R_RISCV_RVC_JUMP, ja
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c.j 0
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.reloc ., R_RISCV_RVC_JUMP, jb
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c.jal 0
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