Last change
on this file since 678 was
444,
checked in by satin@…, 7 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.1 KB
|
Rev | Line | |
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[444] | 1 | /* |
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| 2 | * Mon2000 Trap handler (syscall interface). |
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| 3 | * |
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| 4 | * This trap handler is linked into the mon2000 libgloss (libmon). |
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| 5 | */ |
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| 6 | #include <reent.h> |
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| 7 | #include "syscall.h" |
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| 8 | |
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| 9 | int __trap0 (int function, int p1, int p2, int p3, struct _reent *r) |
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| 10 | { |
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| 11 | int rc = 0; |
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| 12 | |
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| 13 | switch (function) { |
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| 14 | case SYS_exit: |
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| 15 | /* loop so GDB can't go past system exit call */ |
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| 16 | while (1) { |
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| 17 | asm volatile ( |
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| 18 | "ldi r0, #0 \n" |
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| 19 | "trap #15 ; return control to Mon2000"); |
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| 20 | } |
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| 21 | break; |
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| 22 | |
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| 23 | case SYS_write: |
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| 24 | { |
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| 25 | int i; |
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| 26 | |
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| 27 | for( i=0; i<p3; i++ ) { |
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| 28 | asm volatile ( |
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| 29 | "ldi r0, #2 \n" |
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| 30 | "ldi r1, #15 ; load Ctrl-O (ASCII 15) \n" |
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| 31 | "trap #15 ; write Ctrl-O for quoting purposes" ); |
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| 32 | |
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| 33 | asm volatile ( |
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| 34 | "ldi r0, #2 \n" |
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| 35 | "ldb r1, %0 \n" |
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| 36 | "trap #15 ; write character to console" |
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| 37 | : /* no outputs */ |
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| 38 | : "m" (((char*)p2)[i])); |
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| 39 | } |
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| 40 | |
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| 41 | rc = p3; /* return number of chars written */ |
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| 42 | break; |
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| 43 | } |
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| 44 | |
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| 45 | default: |
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| 46 | rc = 0; |
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| 47 | break; |
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| 48 | } |
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| 49 | |
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| 50 | return rc; |
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| 51 | } |
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| 52 | |
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| 53 | |
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