derek.holloway
7502bf64a4
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77 lines
1.7 KiB
PHP
77 lines
1.7 KiB
PHP
### entry point code
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.macro gdbasm_startup
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# Align the stack pointer to an 8-byte boundary.
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lhi %r0,-8
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nr %r15,%r0
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# Reserve space for the standard stack frame:
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# back chain, and space for the callee to save its registers.
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ahi %r15,-104
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# Zero this frame's back chain pointer.
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xc 0(4,%r15),0(%r15)
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.endm
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### Call a function.
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.macro gdbasm_call subr
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# Put the address of the constant in %r1, load the constant
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# (SUBR's address), and jump to it.
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bras %r1, .Lafterconst\@
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.long \subr
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.Lafterconst\@:
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l %r1,0(%r1)
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basr %r14,%r1
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.endm
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### Exit with a zero status.
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.macro gdbasm_exit0
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lhi %r2, 0
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svc 1
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.endm
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### Standard subroutine prologue.
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.macro gdbasm_enter
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# Save all the callee-saves registers. What the heck.
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stm %r6,%r15,24(%r15)
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# Allocate the stack frame, and write the back chain pointer.
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# Keep the original SP in %r11.
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lr %r1,%r15
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ahi %r15,-96
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st %r1,0(%r15)
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.endm
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### Standard subroutine epilogue.
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.macro gdbasm_leave
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# Restore all our registers. This also pops the frame, and
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# restores our return address.
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lm %r6,%r15,120(%r15)
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# Jump to the return address.
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br %r14
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.endm
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### Several nops.
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.macro gdbasm_several_nops
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lr %r0, %r0
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lr %r0, %r0
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lr %r0, %r0
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lr %r0, %r0
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.endm
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### Declare an `int' variable.
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.purgem gdbasm_datavar
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.macro gdbasm_datavar name value
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.data
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\name:
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.long \value
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.endm
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