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documented .use16 and .use32

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ceriel 1990-03-09 12:37:19 +00:00
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7
man/i386_as.6
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@ -63,6 +63,7 @@ expr (reg1) (reg2 * scale)
contents of \fIreg2\fP multiplied by \fIscale\fP, contents of \fIreg2\fP multiplied by \fIscale\fP,
is the address of the operand. is the address of the operand.
\fIscale\fP can be either 1, 2, 4, or 8. \fIscale\fP can be either 1, 2, 4, or 8.
This mode is only allowed for 32-bit addressing.
The next addressing mode is only allowed with the instructions The next addressing mode is only allowed with the instructions
"callf" or "jmpf". "callf" or "jmpf".
@ -102,6 +103,12 @@ for the next instruction, and also generate code to set the processor
temporarily in 16-bit operand mode. temporarily in 16-bit operand mode.
.IP "" .IP ""
Prefixes only affect the next instruction. Prefixes only affect the next instruction.
.IP ""
There are also the .use32 and .use16 assembler directives, which do not
generate code, but change the default for operand and address sizes.
Obviously, .use16 gives 16-bit modes, .use32 gives 32-bit modes.
This is useful for assembling real mode 80386 code, or pure 16-bit
modules (that do not have the D-bit set in the segment descriptor).
.SH "SEE ALSO" .SH "SEE ALSO"
uni_ass(6), uni_ass(6),
ack(1), ack(1),