diff options
Diffstat (limited to 'man/as86.1')
| -rw-r--r-- | man/as86.1 | 47 |
1 files changed, 34 insertions, 13 deletions
@@ -5,7 +5,7 @@ as86 \- Assembler for 8086..80386 processors .SH SYNOPSIS .B as86 -.RB [ -03agjuw ] +.RB [ -0123agjuw ] .RB [ -lm [ list ]] .RB [ -n\ name ] .RB [ -o\ obj ] @@ -60,10 +60,17 @@ arguments can be '-' for standard in/out. .TP .B -0 -start with 16-bit code segment +start with 16-bit code segment, warn for all instructions > 8086 +.TP +.B -1 +start with 16-bit code segment, warn for all instructions > 80186 +.TP +.B -2 +start with 16-bit code segment, warn for all instructions > 80286 .TP .B -3 -start with 32-bit code segment +start with 32-bit code segment, don't warn for any instructions. (not even +486 or 586) .TP .B -a enable partial compatibility with Minix asld @@ -72,13 +79,17 @@ enable partial compatibility with Minix asld only put global symbols in object or symbol file .TP .B -j -force all jumps to be long, don't use this with hand written assembler -use the +replace short jumps that don't reach with 5 byte sequences, this causes the +assembler to add an extra pass to try to determine if the long jump is +really needed. If you add a second +.B -j +the assembler will keep adding passes until the labels all stabilise (to +a maximum of 30 passes) +Don't use this with hand written assembler use the explicit .B br\ bmi\ bcc -style opcodes or the +style opcodes for 8086 code or the .B jmp\ near -style. The former generates 8086 compatible sequences the latter is 386 only -for the conditional jumps. +style for conditional i386 instructions. .TP .B -l produce list file, filename may follow @@ -205,11 +216,16 @@ Return to stacked assemble location .B GET INCLUDE Insert new file (no quotes on name) .TP -.B USE16 -Define default operand size as 16 bit +.BR USE16\ [ cpu ] +Define default operand size as 16 bit, argument is cpu type the code is +expected to run on (86, 186, 286, 386, 486, 586) instructions for cpus +later than specified give a warning. .TP -.B USE32 -Define default operand size as 32 bit +.BR USE32\ [ cpu ] +Define default operand size as 32 bit, argument is cpu type the code is +expected to run on (86, 186, 286, 386, 486, 586) instructions for cpus +later than specified give a warning. If the cpu is not mentioned the +assembler ensures it is >= 80386. .TP .B END End of compilation for this file. @@ -340,7 +356,12 @@ as(1), ld86(1), bcc(1) The 6809 version does not support -0, -3, -a or -j. If this assembler is compiled with BCC this is classed as a 'small' -compiler, so there is a maximum input line length of 256 characters. +compiler, so there is a maximum input line length of 256 characters +and the instruction to cpu checking is not included. + +The checking for instructions that work on specific cpus is probably +not complete, the distinction between 80186 and 80286 is especially +problematic. The .B .text |