From 68d67cdef38450b3d48ad73b6d61ef54af228d2a Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Wed, 26 May 2010 16:08:22 +0000 Subject: Add SIB. 2010-05-26 H.J. Lu * i386-dis.c (sib): New. (get_sib): Likewise. (print_insn): Call get_sib. OP_E_memory): Use sib. --- opcodes/i386-dis.c | 32 ++++++++++++++++++++++++++++---- 1 file changed, 28 insertions(+), 4 deletions(-) (limited to 'opcodes/i386-dis.c') diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c index fef9185e5f..ecd8cca2a2 100644 --- a/opcodes/i386-dis.c +++ b/opcodes/i386-dis.c @@ -2303,6 +2303,13 @@ static struct } modrm; static unsigned char need_modrm; +static struct + { + int scale; + int index; + int base; + } +sib; static struct { int register_specifier; @@ -11243,6 +11250,22 @@ get_valid_dis386 (const struct dis386 *dp, disassemble_info *info) return get_valid_dis386 (dp, info); } +static void +get_sib (disassemble_info *info) +{ + /* If modrm.mod == 3, operand must be register. */ + if (need_modrm + && address_mode != mode_16bit + && modrm.mod != 3 + && modrm.rm == 4) + { + FETCH_DATA (info, codep + 2); + sib.index = (codep [1] >> 3) & 7; + sib.scale = (codep [1] >> 6) & 3; + sib.base = codep [1] & 7; + } +} + static int print_insn (bfd_vma pc, disassemble_info *info) { @@ -11528,6 +11551,7 @@ print_insn (bfd_vma pc, disassemble_info *info) if (dp->name == NULL && dp->op[0].bytemode == FLOATCODE) { + get_sib (info); dofloat (sizeflag); } else @@ -11535,6 +11559,7 @@ print_insn (bfd_vma pc, disassemble_info *info) dp = get_valid_dis386 (dp, info); if (dp != NULL && putop (dp->name, sizeflag) == 0) { + get_sib (info); for (i = 0; i < MAX_OPERANDS; ++i) { obufp = op_out[i]; @@ -12935,10 +12960,9 @@ OP_E_memory (int bytemode, int sizeflag) if (base == 4) { havesib = 1; - FETCH_DATA (the_info, codep + 1); - vindex = (*codep >> 3) & 7; - scale = (*codep >> 6) & 3; - base = *codep & 7; + vindex = sib.index; + scale = sib.scale; + base = sib.base; USED_REX (REX_X); if (rex & REX_X) vindex += 8; -- cgit v1.2.1