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Last change
on this file since 571 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
451 bytes
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| Line | |
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| 1 | ; Trap 0 handler (syscall interface). |
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| 2 | ; |
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| 3 | ; The trap handler returns the result in r0 and the error code (errno value) |
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| 4 | ; in r2. r1 is reserved in case an 8 byte quantity ever needs to be |
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| 5 | ; returned in registers. |
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| 6 | |
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| 7 | .text |
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| 8 | .global __trap0 |
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| 9 | __trap0: |
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| 10 | trap #0 ; trap 0 returns result in r0, error code in r2 |
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| 11 | cmpui r2,#1 ; is error code zero? |
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| 12 | bc .Lret ; yes, skip setting errno |
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| 13 | ld r4,@(sp) ; no, set errno |
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| 14 | st r2,@r4 |
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| 15 | .Lret: |
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| 16 | jmp lr ; return to caller |
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