diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2014-05-21 08:19:16 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2014-05-21 08:24:21 -0700 |
| commit | 0a9250c2ab32028dfdca6578655882b4be6a5c04 (patch) | |
| tree | a1a48e04b96a2060c8ef4eb464c0fedd080ee510 | |
| parent | 13558c1e7cb2a1a2ea1b1c13ff554063de8afaf0 (diff) | |
| download | nasm-0a9250c2ab32028dfdca6578655882b4be6a5c04.tar.gz nasm-0a9250c2ab32028dfdca6578655882b4be6a5c04.tar.bz2 nasm-0a9250c2ab32028dfdca6578655882b4be6a5c04.zip | |
BR 3392279: Fix duplicated REX prefixes
The fix for BR 3392278:
aa29b1d93f5a assemble.c: Don't drop rex prefix from instruction itself
... would cause multiple REX prefixes to be emitted for some
instructions. Create a new flag to indicate that REX has already been
emitted, which can be cleared for each instance of an instruction.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | assemble.c | 9 | ||||
| -rw-r--r-- | nasm.h | 3 | ||||
| -rw-r--r-- | test/times.asm | 8 |
3 files changed, 17 insertions, 3 deletions
@@ -1,6 +1,6 @@ /* ----------------------------------------------------------------------- * * - * Copyright 1996-2013 The NASM Authors - All Rights Reserved + * Copyright 1996-2014 The NASM Authors - All Rights Reserved * See the file AUTHORS included with the NASM distribution for * the specific copyright holders. * @@ -1365,9 +1365,12 @@ static int64_t calcsize(int32_t segment, int64_t offset, int bits, static inline unsigned int emit_rex(insn *ins, int32_t segment, int64_t offset, int bits) { if (bits == 64) { - if ((ins->rex & REX_REAL) && !(ins->rex & (REX_V | REX_EV))) { + if ((ins->rex & REX_REAL) && + !(ins->rex & (REX_V | REX_EV)) && + !ins->rex_done) { int rex = (ins->rex & REX_REAL) | REX_P; out(offset, segment, &rex, OUT_RAWDATA, 1, NO_SEG, NO_SEG); + ins->rex_done = true; return 1; } } @@ -1389,6 +1392,8 @@ static void gencode(int32_t segment, int64_t offset, int bits, uint8_t opex = 0; enum ea_type eat = EA_SCALAR; + ins->rex_done = false; + while (*codes) { c = *codes++; op1 = (c & 3) + ((opex & 1) << 2); @@ -1,6 +1,6 @@ /* ----------------------------------------------------------------------- * * - * Copyright 1996-2013 The NASM Authors - All Rights Reserved + * Copyright 1996-2014 The NASM Authors - All Rights Reserved * See the file AUTHORS included with the NASM distribution for * the specific copyright holders. * @@ -702,6 +702,7 @@ typedef struct insn { /* an instruction itself */ int eops_float; /* true if DD and floating */ int32_t times; /* repeat count (TIMES prefix) */ bool forw_ref; /* is there a forward reference? */ + bool rex_done; /* REX prefix emitted? */ int rex; /* Special REX Prefix */ int vexreg; /* Register encoded in VEX prefix */ int vex_cm; /* Class and M field for VEX prefix */ diff --git a/test/times.asm b/test/times.asm new file mode 100644 index 0000000..a8e3d58 --- /dev/null +++ b/test/times.asm @@ -0,0 +1,8 @@ + bits 64 + +; Broken per BR 3392278 + times 4 paddd xmm8, xmm11 + +; Broken per BR 3392279 + bswap r12d + times 4 bswap r12d |