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https://sourceware.org/git/binutils-gdb.git
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26da232cbd
Provide a simple example simulator for people porting to new targets to use as a reference. This one has the advantage of being used by people and having a fun program available for it. It doesn't require a special target -- the example simulators can be built for any existing port.
109 lines
1.5 KiB
PHP
109 lines
1.5 KiB
PHP
# Macros for the fake ISA. Keep in sync with example-synacor/README.arch-spec.
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# These .set macros will generate symbols in the output ELF, but it also allows
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# use to use them as arguments to the insns below. Oh well.
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.set r0, 32768
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.set r1, r0+1
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.set r2, r0+2
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.set r3, r0+3
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.set r4, r0+4
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.set r5, r0+5
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.set r6, r0+6
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.set r7, r0+7
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# The target is little endian, so make sure we output the 16-bit words as such.
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.macro _op op:req, more:vararg
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.byte \op & 0xff, (\op >> 8) & 0xff
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.ifnb \more
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_op \more
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.endif
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.endm
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.macro HALT
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_op 0
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.endm
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.macro SET a:req, b:req
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_op 1, \a, \b
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.endm
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.macro PUSH a:req
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_op 2, \a
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.endm
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.macro POP a:req
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_op 3, \a
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.endm
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.macro EQ a:req, b:req, c:req
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_op 4, \a, \b, \c
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.endm
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.macro GT a:req, b:req, c:req
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_op 5, \a, \b, \c
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.endm
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.macro JMP a:req
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_op 6, \a
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.endm
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.macro JT a:req, b:req
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_op 7, \a, \b
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.endm
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.macro JF a:req, b:req
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_op 8, \a, \b
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.endm
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.macro ADD a:req, b:req, c:req
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_op 9, \a, \b, \c
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.endm
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.macro MULT a:req, b:req, c:req
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_op 10, \a, \b, \c
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.endm
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.macro MOD a:req, b:req, c:req
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_op 11, \a, \b, \c
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.endm
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.macro AND a:req, b:req, c:req
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_op 12, \a, \b, \c
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.endm
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.macro OR a:req, b:req, c:req
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_op 13, \a, \b, \c
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.endm
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.macro NOT a:req, b:req
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_op 14, \a, \b
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.endm
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.macro RMEM a:req, b:req
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_op 15, \a, \b
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.endm
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.macro WMEM a:req, b:req
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_op 16, \a, \b
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.endm
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.macro CALL a:req
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_op 17, \a
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.endm
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.macro RET
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_op 18
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.endm
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.macro OUT a:req
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_op 19, \a
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.endm
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.macro IN a:req
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_op 20, \a
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.endm
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.macro NOOP
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_op 21
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.endm
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