diff options
| -rw-r--r-- | include/opcode/ChangeLog | 6 | ||||
| -rw-r--r-- | include/opcode/i386.h | 16 |
2 files changed, 16 insertions, 6 deletions
diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog index b4411c3..e15034e 100644 --- a/include/opcode/ChangeLog +++ b/include/opcode/ChangeLog @@ -1,3 +1,9 @@ +Mon Mar 30 10:25:54 1998 Alan Modra <alan@spri.levels.unisa.edu.au> + + * i386.h (i386_optab): Change second operand constraint of `mov + sreg,reg|mem' instruction from Reg16|Mem to WordReg|WordMem to + allow legal instructions such as `movl %gs,%esi' + Fri Mar 27 18:30:52 1998 Ian Lance Taylor <ian@cygnus.com> * h8300.h: Various changes to fully bracket initializers. diff --git a/include/opcode/i386.h b/include/opcode/i386.h index 47fa261..c89cf18 100644 --- a/include/opcode/i386.h +++ b/include/opcode/i386.h @@ -1,5 +1,5 @@ /* i386-opcode.h -- Intel 80386 opcode table - Copyright 1989, 91, 92, 93, 94, 95, 96, 1997 Free Software Foundation. + Copyright 1989, 91, 92, 93, 94, 95, 96, 97, 1998 Free Software Foundation. This file is part of GAS, the GNU Assembler, and GDB, the GNU Debugger. @@ -32,7 +32,11 @@ static const template i386_optab[] = { { "mov", 2, 0x88, _, DW|Modrm, { Reg, Reg|Mem, 0 } }, { "mov", 2, 0xb0, _, ShortFormW, { Imm, Reg, 0 } }, { "mov", 2, 0xc6, _, W|Modrm, { Imm, Reg|Mem, 0 } }, -{ "mov", 2, 0x8c, _, D|Modrm, { SReg3|SReg2, Reg16|Mem, 0 } }, +/* The next instruction accepts WordReg so that `movl %gs,%esi' can be + used to move a segment register to a 32 bit register without using + a size prefix, which works although Intel does not document it. I + think it clobbers the upper 16 bits in the 32 bit register. */ +{ "mov", 2, 0x8c, _, D|Modrm, { SReg3|SReg2, WordReg|WordMem, 0 } }, /* move to/from control debug registers */ { "mov", 2, 0x0f20, _, D|Modrm, { Control, Reg32, 0} }, { "mov", 2, 0x0f21, _, D|Modrm, { Debug, Reg32, 0} }, @@ -464,8 +468,8 @@ static const template i386_optab[] = { /* protection control */ {"arpl", 2, 0x63, _, Modrm, { Reg16, Reg16|Mem, 0} }, {"lar", 2, 0x0f02, _, Modrm|ReverseRegRegmem, { WordReg|Mem, WordReg, 0} }, -{"lgdt", 1, 0x0f01, 2, Modrm, { Mem, 0, 0} }, -{"lidt", 1, 0x0f01, 3, Modrm, { Mem, 0, 0} }, +{"lgdt", 1, 0x0f01, 2, Modrm|LinearAddress, { Mem, 0, 0} }, +{"lidt", 1, 0x0f01, 3, Modrm|LinearAddress, { Mem, 0, 0} }, {"lldt", 1, 0x0f00, 2, Modrm, { WordReg|Mem, 0, 0} }, {"lmsw", 1, 0x0f01, 6, Modrm, { WordReg|Mem, 0, 0} }, {"lsl", 2, 0x0f03, _, Modrm|ReverseRegRegmem, { WordReg|Mem, WordReg, 0} }, @@ -943,9 +947,9 @@ static const seg_entry *const two_byte_segment_defaults[] = { /* mode 0 */ &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds, /* mode 1 */ - &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds, + &ds, &ds, &ds, &ds, &ss, &ss, &ds, &ds, /* mode 2 */ - &ds, &ds, &ds, &ds, &ss, &ds, &ds, &ds, + &ds, &ds, &ds, &ds, &ss, &ss, &ds, &ds, /* mode 3 --- not a memory reference; never referenced */ }; |