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Diffstat (limited to 'lib/libc/alpha/gen/_setjmp.S')
-rw-r--r-- | lib/libc/alpha/gen/_setjmp.S | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/lib/libc/alpha/gen/_setjmp.S b/lib/libc/alpha/gen/_setjmp.S new file mode 100644 index 0000000..2aa8c55 --- /dev/null +++ b/lib/libc/alpha/gen/_setjmp.S @@ -0,0 +1,123 @@ +/* $NetBSD: _setjmp.S,v 1.2 1996/10/17 03:08:03 cgd Exp $ */ + +/* + * Copyright (c) 1994, 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Chris G. Demetriou + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +#include <machine/asm.h> + +/* + * C library -- _setjmp, _longjmp + * + * _longjmp(a,v) + * will generate a "return(v)" from + * the last call to + * _setjmp(a) + * by restoring registers from the stack, + * The previous signal state is NOT restored. + */ + + .set noreorder + +LEAF(_setjmp, 1) + LDGP(pv) + stq ra, (2 * 8)(a0) /* sc_pc = return address */ + stq s0, (( 9 + 4) * 8)(a0) /* saved bits of sc_regs */ + stq s1, ((10 + 4) * 8)(a0) + stq s2, ((11 + 4) * 8)(a0) + stq s3, ((12 + 4) * 8)(a0) + stq s4, ((13 + 4) * 8)(a0) + stq s5, ((14 + 4) * 8)(a0) + stq s6, ((15 + 4) * 8)(a0) + stq ra, ((26 + 4) * 8)(a0) + stq sp, ((30 + 4) * 8)(a0) + ldiq t0, 0xacedbadd /* sigcontext magic number */ + stq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */ + /* Too bad we can't check if we actually used FP */ + ldiq t0, 1 + stq t0, (36 * 8)(a0) /* say we've used FP. */ + stt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */ + stt fs1, ((3 + 37) * 8)(a0) + stt fs2, ((4 + 37) * 8)(a0) + stt fs3, ((5 + 37) * 8)(a0) + stt fs4, ((6 + 37) * 8)(a0) + stt fs5, ((7 + 37) * 8)(a0) + stt fs6, ((8 + 37) * 8)(a0) + stt fs7, ((9 + 37) * 8)(a0) + mf_fpcr ft0 /* get FP control reg */ + stt ft0, (69 * 8)(a0) /* and store it in sc_fpcr */ + stq zero, (70 * 8)(a0) /* FP software control XXX */ + stq zero, (71 * 8)(a0) /* sc_reserved[0] */ + stq zero, (72 * 8)(a0) /* sc_reserved[1] */ + stq zero, (73 * 8)(a0) /* sc_xxx[0] */ + stq zero, (74 * 8)(a0) /* sc_xxx[1] */ + stq zero, (75 * 8)(a0) /* sc_xxx[2] */ + stq zero, (76 * 8)(a0) /* sc_xxx[3] */ + stq zero, (77 * 8)(a0) /* sc_xxx[4] */ + stq zero, (78 * 8)(a0) /* sc_xxx[5] */ + stq zero, (79 * 8)(a0) /* sc_xxx[6] */ + stq zero, (80 * 8)(a0) /* sc_xxx[7] */ + + mov zero, v0 /* return zero */ + RET +END(_setjmp) + +LEAF(_longjmp, 2) + LDGP(pv) + ldq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */ + ldiq t1, 0xacedbadd + cmpeq t0, t1, t0 + beq t0, botch /* If the magic was bad, punt */ + + ldq ra, (2 * 8)(a0) /* sc_pc = return address */ + ldq s0, (( 9 + 4) * 8)(a0) /* saved bits of sc_regs */ + ldq s1, ((10 + 4) * 8)(a0) + ldq s2, ((11 + 4) * 8)(a0) + ldq s3, ((12 + 4) * 8)(a0) + ldq s4, ((13 + 4) * 8)(a0) + ldq s5, ((14 + 4) * 8)(a0) + ldq s6, ((15 + 4) * 8)(a0) + /* ldq ra, ((26 + 4) * 8)(a0) set above */ + ldq sp, ((30 + 4) * 8)(a0) + ldt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */ + ldt fs1, ((3 + 37) * 8)(a0) + ldt fs2, ((4 + 37) * 8)(a0) + ldt fs3, ((5 + 37) * 8)(a0) + ldt fs4, ((6 + 37) * 8)(a0) + ldt fs5, ((7 + 37) * 8)(a0) + ldt fs6, ((8 + 37) * 8)(a0) + ldt fs7, ((9 + 37) * 8)(a0) + ldt ft0, (69 * 8)(a0) /* get sc_fpcr */ + mt_fpcr ft0 /* and restore it. */ + + mov a1, v0 /* return second arg */ + RET + +botch: + CALL(longjmperror) + CALL(abort) + RET /* "can't" get here... */ +END(_longjmp) |