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https://github.com/netwide-assembler/nasm.git
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a7ecf2646d
Automatically assign values to the instruction flags; we ended up with a case where pushing flags into the next dword caused comparison failures due to other places in the code explicitly comparing field[3]. This creates necessary defines for this not to happen; it also cleans up a fair bit of the iflag code. This resolves BR 3392454. Reported-by: Thomasz Kantecki <tomasz.kantecki@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* insns.h header file for insns.c
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*
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* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
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* Julian Hall. All rights reserved. The software is
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* redistributable under the license given in the file "LICENSE"
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* distributed in the NASM archive.
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*/
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#ifndef NASM_INSNS_H
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#define NASM_INSNS_H
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#include "nasm.h"
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#include "tokens.h"
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#include "iflag.h"
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/* if changed, ITEMPLATE_END should be also changed accordingly */
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struct itemplate {
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enum opcode opcode; /* the token, passed from "parser.c" */
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int operands; /* number of operands */
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opflags_t opd[MAX_OPERANDS]; /* bit flags for operand types */
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decoflags_t deco[MAX_OPERANDS]; /* bit flags for operand decorators */
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const uint8_t *code; /* the code it assembles to */
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uint32_t iflag_idx; /* some flags referenced by index */
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};
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/* Use this helper to test instruction template flags */
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static inline bool itemp_has(const struct itemplate *itemp, unsigned int bit)
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{
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return iflag_test(&insns_flags[itemp->iflag_idx], bit);
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}
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/* Disassembler table structure */
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/*
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* If n == -1, then p points to another table of 256
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* struct disasm_index, otherwise p points to a list of n
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* struct itemplates to consider.
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*/
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struct disasm_index {
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const void *p;
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int n;
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};
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/* Tables for the assembler and disassembler, respectively */
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extern const struct itemplate * const nasm_instructions[];
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extern const struct disasm_index itable[256];
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extern const struct disasm_index * const itable_vex[NASM_VEX_CLASSES][32][4];
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/* Common table for the byte codes */
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extern const uint8_t nasm_bytecodes[];
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/*
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* this define is used to signify the end of an itemplate
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*/
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#define ITEMPLATE_END {I_none,0,{0,},{0,},NULL,0}
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/* Width of Dx and RESx instructions */
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int const_func idata_bytes(enum opcode opcode);
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int const_func resv_bytes(enum opcode opcode);
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/*
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* Pseudo-op tests
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*/
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/* DB-type instruction (DB, DW, ...) */
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static inline bool opcode_is_db(enum opcode opcode)
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{
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return idata_bytes(opcode) > 0;
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}
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/* RESB-type instruction (RESB, RESW, ...) */
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static inline bool opcode_is_resb(enum opcode opcode)
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{
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return resv_bytes(opcode) > 0;
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}
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#endif /* NASM_INSNS_H */
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