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llvm-mirror/test/MC/ELF/nobits-non-zero-value.s

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[MC][COFF][ELF] Reject instructions in IMAGE_SCN_CNT_UNINITIALIZED_DATA/SHT_NOBITS sections For `.bss; nop`, MC inappropriately calls abort() (via report_fatal_error()) with a message `cannot have fixups in virtual section!` It is a bug to crash for invalid user input. Fix it by erroring out early in EmitInstToData(). Similarly, emitIntValue() in a virtual section (SHT_NOBITS in ELF) can crash with the mssage `non-zero initializer found in section '.bss'` (see D4199) It'd be nice to report the location but so many directives can call emitIntValue() and it is difficult to track every location. Note, COFF does not crash because MCAssembler::writeSectionData() is not called for an IMAGE_SCN_CNT_UNINITIALIZED_DATA section. Note, GNU as' arm64 backend reports ``Error: attempt to store non-zero value in section `.bss'`` for a non-zero .inst but fails to do so for other instructions. We simply reject all instructions, even if the encoding is all zeros. The Mach-O counterpart is D48517 (see `test/MC/MachO/zerofill-text.s`) Reviewed By: rnk, skan Differential Revision: https://reviews.llvm.org/D78138
2020-04-14 20:05:21 +02:00
# RUN: not llvm-mc -filetype=obj -triple=x86_64 %s -o /dev/null 2>&1 | FileCheck %s
## -filetype=asm does not check the error.
# RUN: llvm-mc -triple=x86_64 %s
.section .tbss,"aw",@nobits
# MCRelaxableFragment
# CHECK: {{.*}}.s:[[#@LINE+1]]:3: error: SHT_NOBITS section '.tbss' cannot have instructions
jmp foo
.bss
# CHECK: {{.*}}.s:[[#@LINE+1]]:3: error: SHT_NOBITS section '.bss' cannot have instructions
addb %al,(%rax)
# CHECK: <unknown>:0: error: SHT_NOBITS section '.bss' cannot have non-zero initializers
.long 1
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