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49 lines
1.5 KiB
ArmAsm
49 lines
1.5 KiB
ArmAsm
******************************************************************************
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*
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* Assembly language interface to signal processing in C.
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*
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* Majority of work is done by "signal.c". All we do is take the
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* exception and call the proper C function. Registers, condition
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* codes, etc. are all preserved. A return from the function causes
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* resumption of normal processing.
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*
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******************************************************************************
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.globl __illinst * Illegal instruction EPA
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.globl __trace * Trace Trap EPA
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.globl __trap * All trap instructions
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.globl __buserr * BUSERR, addressing EPA
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.globl __arith * Arithmetic traps EPA
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.comm ___signal,64 * -> epa's of C functions
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.bss * Ugh!
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epa: .ds.l 1 * non-reentrant!!
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.text
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__illinst: *
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move.l ___signal+16,epa * Set up epa
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add.l #2,2(a7) * Bump PC to next inst
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bra process * Process exception
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__trace:
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move.l ___signal+20,epa * Set up epa
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bra process * process
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__trap: *
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move.l ___signal+24,epa * Select epa
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bra process *
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__buserr: * Here for buserr crap
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cmpm.l (a7)+,(a7)+ * Prune junk
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move.l ___signal+40,epa * move in epa
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bra process * process exception
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__arith: *
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move.l ___signal+32,epa * move in epa
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process: * Here to process exception
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movem.l d0-d7/a0-a6,-(sp) * Save all registers
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move.l epa,a0 * Load entry point
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clr.l a6 * Clear out a6
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jsr (a0) * Call processing routine
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movem.l (sp)+,d0-d7/a0-a6 * restore registers
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rtr * Resume processing
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