mirror/nasm
2
0
Fork 0
mirror of https://github.com/netwide-assembler/nasm.git synced 2025-04-12 18:40:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

LEA: allow immediate syntax; ignore operand size entirely

Browse Source 
The memory operand size of LEA doesn't matter in any way as it isn't
"real memory". Add an ANYSIZE option to ignore sizes entirely.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel) 2019-08-14 15:23:00 -07:00
parent a635809620
commit 02b60ddd1c
4 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
asm/assemble.c
View File

@ -2440,6 +2440,9 @@ static enum match_result matches(const struct itemplate *itemp,
case IF_GENBIT(IF_SZ):
asize = BITS512;
break;
case IF_GENBIT(IF_ANYSIZE):
asize = SIZE_MASK;
break;
case IF_GENBIT(IF_SIZE):
switch (bits) {
case 16:

2
include/iflag.h
View File

@ -71,7 +71,7 @@ static inline int iflag_cmp(const iflag_t *a, const iflag_t *b)
IF_GEN_HELPER(xor, ^)
/* Some helpers which are to work with predefined masks */
#define IF_SMASK (IFM_SB|IFM_SW|IFM_SD|IFM_SQ|IFM_SO|IFM_SY|IFM_SZ|IFM_SIZE)
#define IF_SMASK (IFM_SB|IFM_SW|IFM_SD|IFM_SQ|IFM_SO|IFM_SY|IFM_SZ|IFM_SIZE|IFM_ANYSIZE)
#define IF_ARMASK (IFM_AR0|IFM_AR1|IFM_AR2|IFM_AR3|IFM_AR4)
#define _itemp_smask(idx) (insns_flags[(idx)].field[0] & IF_SMASK)

1
x86/iflags.ph
View File

@ -16,6 +16,7 @@ if_("SY", "Unsized operands can't be non-yword");
if_("SZ", "Unsized operands can't be non-zword");
if_("SIZE", "Unsized operands must match the bitsize");
if_("SX", "Unsized operands not allowed");
if_("ANYSIZE", "Ignore operand size even if explicit");
if_("AR0", "SB, SW, SD applies to argument 0");
if_("AR1", "SB, SW, SD applies to argument 1");
if_("AR2", "SB, SW, SD applies to argument 2");

9
x86/insns.dat
View File

@ -732,9 +732,12 @@ LAR reg64,reg32 [rm: o64 0f 02 /r] X64,PROT
LAR reg64,reg64 [rm: o64 0f 02 /r] X64,PROT
LDS reg16,mem [rm: o16 c5 /r] 8086,NOLONG
LDS reg32,mem [rm: o32 c5 /r] 386,NOLONG
LEA reg16,mem [rm: o16 8d /r] 8086
LEA reg32,mem [rm: o32 8d /r] 386
LEA reg64,mem [rm: o64 8d /r] X64
LEA reg16,mem [rm: o16 8d /r] 8086,ANYSIZE
LEA reg32,mem [rm: o32 8d /r] 386,ANYSIZE
LEA reg64,mem [rm: o64 8d /r] X64,ANYSIZE
LEA reg16,imm [rm: o16 8d /r] 8086,ND,ANYSIZE
LEA reg32,imm [rm: o32 8d /r] 386,ND,ANYSIZE
LEA reg64,imm [rm: o64 8d /r] X64,ND,ANYSIZE
LEAVE void [ c9] 186
LES reg16,mem [rm: o16 c4 /r] 8086,NOLONG
LES reg32,mem [rm: o32 c4 /r] 386,NOLONG