diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/nasmdoc.src | 50 |
1 files changed, 25 insertions, 25 deletions
diff --git a/doc/nasmdoc.src b/doc/nasmdoc.src index 0c61fc1..588e295 100644 --- a/doc/nasmdoc.src +++ b/doc/nasmdoc.src @@ -2920,7 +2920,8 @@ refer to the last unmatched \c{if} or \c{else}. NASM defines a set of standard macros, which are already defined when it starts to process any source file. If you really need a program to be assembled with no pre-defined macros, you can use the -\i\c{%clear} directive to empty the preprocessor of everything. +\i\c{%clear} directive to empty the preprocessor of everything but +context-local preprocessor variables and single-line macros. Most \i{user-level assembler directives} (see \k{directive}) are implemented as macros which invoke primitive directives; these are @@ -7098,12 +7099,12 @@ flag, use \c{ADD} (\k{insADD}). \c ADD reg16,r/m16 ; o16 03 /r [8086] \c ADD reg32,r/m32 ; o32 03 /r [386] -\c ADD r/m8,imm8 ; 80 /0 ib [8086] -\c ADD r/m16,imm16 ; o16 81 /0 iw [8086] -\c ADD r/m32,imm32 ; o32 81 /0 id [386] +\c ADD r/m8,imm8 ; 80 /7 ib [8086] +\c ADD r/m16,imm16 ; o16 81 /7 iw [8086] +\c ADD r/m32,imm32 ; o32 81 /7 id [386] -\c ADD r/m16,imm8 ; o16 83 /0 ib [8086] -\c ADD r/m32,imm8 ; o32 83 /0 ib [386] +\c ADD r/m16,imm8 ; o16 83 /7 ib [8086] +\c ADD r/m32,imm8 ; o32 83 /7 ib [386] \c ADD AL,imm8 ; 04 ib [8086] \c ADD AX,imm16 ; o16 05 iw [8086] @@ -7536,12 +7537,12 @@ conditional moves are supported. \c CMP reg16,r/m16 ; o16 3B /r [8086] \c CMP reg32,r/m32 ; o32 3B /r [386] -\c CMP r/m8,imm8 ; 80 /0 ib [8086] -\c CMP r/m16,imm16 ; o16 81 /0 iw [8086] -\c CMP r/m32,imm32 ; o32 81 /0 id [386] +\c CMP r/m8,imm8 ; 80 /7 ib [8086] +\c CMP r/m16,imm16 ; o16 81 /7 iw [8086] +\c CMP r/m32,imm32 ; o32 81 /7 id [386] -\c CMP r/m16,imm8 ; o16 83 /0 ib [8086] -\c CMP r/m32,imm8 ; o32 83 /0 ib [386] +\c CMP r/m16,imm8 ; o16 83 /7 ib [8086] +\c CMP r/m32,imm8 ; o32 83 /7 ib [386] \c CMP AL,imm8 ; 3C ib [8086] \c CMP AX,imm16 ; o16 3D iw [8086] @@ -8643,8 +8644,8 @@ to finish what it was doing first. \c FDIV TO fpureg ; DC F8+r [8086,FPU] \c FDIV fpureg,ST0 ; DC F8+r [8086,FPU] -\c FDIVR mem32 ; D8 /0 [8086,FPU] -\c FDIVR mem64 ; DC /0 [8086,FPU] +\c FDIVR mem32 ; D8 /7 [8086,FPU] +\c FDIVR mem64 ; DC /7 [8086,FPU] \c FDIVR fpureg ; D8 F8+r [8086,FPU] \c FDIVR ST0,fpureg ; D8 F8+r [8086,FPU] @@ -11895,12 +11896,11 @@ See also \c{POPA} (\k{insPOPA}). \c PUSHFD ; o32 9C [386] \c PUSHFW ; o16 9C [8086] -\b \c{PUSHFW} pops a word from the stack and stores it in the -bottom 16 bits of the flags register (or the whole flags register, -on processors below a 386). +\b \c{PUSHFW} pushes the bottom 16 bits of the flags register +(or the whole flags register, on processors below a 386) onto +the stack. -\b \c{PUSHFD} pops a doubleword and stores it in the entire flags -register. +\b \c{PUSHFD} pushes the entire flags register onto the stack. \c{PUSHF} is an alias mnemonic for either \c{PUSHFW} or \c{PUSHFD}, depending on the current \c{BITS} setting. @@ -12457,9 +12457,9 @@ processors (Cyrix, IBM, Via). the Machine Status Word, on 286 processors) into the destination operand. See also \c{LMSW} (\k{insLMSW}). -For 32-bit code, this would use the low 16-bits of the specified -register (or a 16bit memory location), without needing an operand -size override byte. +For 32-bit code, this would store all of \c{CR0} in the specified +register (or the bottom 16 bits if the destination is a memory location), + without needing an operand size override byte. \S{insSQRTPD} \i\c{SQRTPD}: Packed Double-Precision FP Square Root @@ -12564,10 +12564,10 @@ The \c{REP} prefix may be used to repeat the instruction \c{CX} (or \c STR r/m16 ; 0F 00 /1 [286,PRIV] \c{STR} stores the segment selector corresponding to the contents of -the Task Register into its operand. When the operand size is a 16-bit -register, the upper 16-bits are cleared to 0s. When the destination -operand is a memory location, 16 bits are written regardless of the -operand size. +the Task Register into its operand. When the operand size is 32 bit and +the destination is a register, the upper 16-bits are cleared to 0s. +When the destination operand is a memory location, 16 bits are +written regardless of the operand size. \S{insSUB} \i\c{SUB}: Subtract Integers |