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Currently the ARM backend only accpets constant expressions as the immediate operand in load and store instructions. This allows the result of symbolic expressions to be used in memory instructions. For example, 0: .space 2048 strb r2, [r0, #(.-0b)] would be assembled into the following instructions. strb r2, [r0, #2048] This only adds support to ldr, ldrb, str, and strb in arm mode to address the build failure of Linux kernel for now, but should facilitate adding support to similar instructions in the future if the need arises. Link: https://github.com/ClangBuiltLinux/linux/issues/1329 Reviewed By: peter.smith, nickdesaulniers Differential Revision: https://reviews.llvm.org/D98916
26 lines
825 B
ArmAsm
26 lines
825 B
ArmAsm
// RUN: llvm-mc -triple=armv7 -filetype=obj %s | llvm-objdump --triple=armv7 -d - | FileCheck %s
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// RUN: not llvm-mc -triple=armv7 -filetype=obj --defsym=ERR=1 < %s -o /dev/null 2>&1 | FileCheck --check-prefix=ERR %s
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.syntax unified
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// Check that the assembler accepts the result of symbolic expressions as the
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// immediate operand in load and stores.
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0:
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// CHECK-LABEL: foo
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.space 1024
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1:
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foo:
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ldr r0, [r1, #(1b - 0b)]
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// CHECK-NEXT: ldr r0, [r1, #1024]
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ldr r0, [r1, #(0b - 1b)]
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// CHECK-NEXT: ldr r0, [r1, #-1024]
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ldrb r0, [r1, #(1b-0b)]
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// CHECK-NEXT: ldrb r0, [r1, #1024]
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str r0, [r1, #(1b-0b)]
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// CHECK-NEXT: str r0, [r1, #1024]
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strb r0, [r1, #(1b-0b)]
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// CHECK-NEXT: strb r0, [r1, #1024]
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.ifdef ERR
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str r0, [r1, 1b]
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// ERR:[[#@LINE-1]]:5: error: unsupported relocation on symbol
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.endif
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