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bff94fbd39
Work through a number of changes toward making matching a lot saner, both to reduce the number of patterns to generate for APX but also to make a number of code patterns simpler. This replaces a fair number of byte codes. Improve a number of error messages, especially related to overflows. Move process_insn() from nasm.c to assemble.c, as it really is the primary entry point to the assembler module. Reorder some prefixes. In particular, F2/F3 override 66 when used as a mandatory prefix, so it makes more sense for them to be closer to the opcode. Move a lot more information into struct insn. It is better to have it in one place; memory consumption is not an issue because struct insn is transient information. Get rid of "optimization levels" and replace it with a mask of flags. That was already halfway done; complete the job. Replace seg:offset in struct out_data with a struct location. It would be better to extend this to more places, too. The ARx and SMx flags are now explicit bitmasks, instead of having a couple of hard-coded ranges. Add __func__ to assert or panic messages. Because of prefix and message changes, a number of travis tests had to be audited and updated. Fix a number of instruction patterns which had .128 when they ought to be .lig. This is no longer a minor issue with the disassembler: for AVX10, the pattern vector length determines how SAE/RC are encoded, and there is no valid 128-bit encoding. However, with .lig the 512-bit encoding can be used. Separate "o64nw" into two pieces: opsize 64 and "nw" = "REX.w not necessary". The latter can be included in non-64-bit patterns. "o64" still set REX.W since that is still the common thing. New "osz" bytecode: emit an OSP *or* REX.W depending on the current mode and operand size. Useful for special cases like "nop" where "o64 nop" probably wants to be encoded as "48 90". Signed-off-by: H. Peter Anvin <hpa@zytor.com>
28 lines
597 B
NASM
28 lines
597 B
NASM
bits 64
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default rel
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section .text
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global _start
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_start:
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mov rax, 1 ; write syscall
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mov rdi, 1
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mov rsi, msg
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mov rdx, msglen
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syscall
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mov rax, 60 ; exit syscall
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sub rdi, rdi
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syscall
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; either of the following lines cause: Error in `nasm': double free or corruption ; Aborted (core dumped)
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foo
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; warning: label alone on a line without a colon might be in error [-w+label-orphan]
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mov r8, r9, r10
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; error: invalid combination of opcode and operands
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add r8d, byte 80h
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; warning: signed byte exceeds bounds [-w+number-overflow]
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section .data
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msg db "Hello, world!", 10
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msglen equ $-msg
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