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Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
2.0 KB
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| Line | |
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| 1 | # |
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| 2 | # Setjmp/longjmp for MeP |
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| 3 | # |
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| 4 | # DJ Delorie, Red Hat Inc. |
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| 5 | # |
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| 6 | # 19 32-bit words in the jmpbuf: |
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| 7 | # $0 |
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| 8 | # $1 |
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| 9 | # ... |
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| 10 | # $15 |
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| 11 | # $pc |
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| 12 | # $hi |
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| 13 | # $lo |
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| 14 | # |
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| 15 | # Note that $0 is saved but not restored. It can't be restored |
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| 16 | # as it's the return value of setjmp, but we save it in case |
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| 17 | # some application wants to see it in the jmp_buf. Ideally, |
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| 18 | # we should not need to save anything that is call-clobbered, |
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| 19 | # but you never know what the user is going to tell gcc with -f |
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| 20 | # options. |
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| 21 | |
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| 22 | .noregerr |
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| 23 | .text |
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| 24 | |
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| 25 | .globl setjmp |
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| 26 | .type setjmp,@function |
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| 27 | |
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| 28 | setjmp: |
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| 29 | |
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| 30 | # $1 is the address of the buffer. We return 0 in $0. |
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| 31 | |
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| 32 | sw $0, ($1) |
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| 33 | sw $1, 4($1) |
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| 34 | sw $2, 8($1) |
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| 35 | sw $3, 12($1) |
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| 36 | sw $4, 16($1) |
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| 37 | sw $5, 20($1) |
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| 38 | sw $6, 24($1) |
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| 39 | sw $7, 28($1) |
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| 40 | sw $8, 32($1) |
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| 41 | sw $9, 36($1) |
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| 42 | sw $10, 40($1) |
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| 43 | sw $11, 44($1) |
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| 44 | sw $12, 48($1) |
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| 45 | sw $13, 52($1) |
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| 46 | sw $14, 56($1) |
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| 47 | sw $15, 60($1) |
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| 48 | |
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| 49 | ldc $0, $lp |
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| 50 | sw $0, 64($1) |
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| 51 | ldc $0, $opt |
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| 52 | sra $0, 24 |
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| 53 | and3 $0, $0, 3 |
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| 54 | beqz $0, sj_skip_hilo |
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| 55 | ldc $0, $hi |
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| 56 | sw $0, 68($1) |
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| 57 | ldc $0, $lo |
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| 58 | sw $0, 72($1) |
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| 59 | sj_skip_hilo: |
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| 60 | |
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| 61 | mov $0, 0 |
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| 62 | ret |
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| 63 | |
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| 64 | .globl longjmp |
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| 65 | .type longjmp,@function |
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| 66 | |
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| 67 | longjmp: |
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| 68 | |
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| 69 | # $1 is the address of the buffer. $2 is the value setjmp |
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| 70 | # returns. We do not faithfully restore $0 or $lp, because |
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| 71 | # the act of calling setjmp clobbered those anyway. |
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| 72 | |
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| 73 | bnez $2, rv_not_zero |
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| 74 | mov $2, 1 |
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| 75 | rv_not_zero: |
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| 76 | |
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| 77 | # We restore $sp first so we can save the return value there, |
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| 78 | # otherwise we'd need to have another unrestored register. |
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| 79 | lw $15, 60($1) |
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| 80 | add3 $sp, $sp, -4 |
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| 81 | sw $2, ($sp) |
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| 82 | |
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| 83 | # Now restore the general registers. |
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| 84 | lw $2, 8($1) |
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| 85 | lw $3, 12($1) |
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| 86 | lw $4, 16($1) |
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| 87 | lw $5, 20($1) |
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| 88 | lw $6, 24($1) |
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| 89 | lw $7, 28($1) |
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| 90 | lw $8, 32($1) |
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| 91 | lw $9, 36($1) |
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| 92 | lw $10, 40($1) |
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| 93 | lw $11, 44($1) |
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| 94 | lw $12, 48($1) |
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| 95 | lw $13, 52($1) |
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| 96 | lw $14, 56($1) |
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| 97 | |
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| 98 | # We restore $pc's value to $lp so that we can just ret later. |
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| 99 | lw $0, 64($1) |
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| 100 | stc $0, $lp |
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| 101 | ldc $0, $opt |
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| 102 | sra $0, 24 |
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| 103 | and3 $0, $0, 3 |
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| 104 | beqz $0, lj_skip_hilo |
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| 105 | lw $0, 68($1) |
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| 106 | stc $0, $hi |
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| 107 | lw $0, 72($1) |
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| 108 | stc $0, $lo |
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| 109 | lj_skip_hilo: |
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| 110 | |
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| 111 | # Restore $1 |
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| 112 | lw $1, 8($1) |
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| 113 | |
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| 114 | # Get the return value off the stack, and restore the stack. |
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| 115 | lw $0, ($sp) |
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| 116 | add3 $sp, $sp, 4 |
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| 117 | |
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| 118 | ret |
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