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90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Brendan Kehoe (brendan@zen.org).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <setjmp.h>
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#include <stdlib.h>
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#ifndef __GNUC__
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#error This file uses GNU C extensions; you must compile with GCC.
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#endif
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static void __attribute__ ((nomips16))
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____longjmp (__jmp_buf env_arg, int val_arg)
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{
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/* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
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the hack around it); force it to use $a1 for the longjmp value.
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Without this it saves $a1 in a register which gets clobbered
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along the way. */
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register struct __jmp_buf_internal_tag *env asm ("a0");
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register int val asm ("a1");
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#ifdef CHECK_SP
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register long sp asm ("$29");
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CHECK_SP (env[0].__sp, sp, long);
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#endif
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#ifdef __mips_hard_float
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/* Pull back the floating point callee-saved registers. */
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asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
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asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
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asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
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asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
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asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
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asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
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#endif
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/* Get the GP. */
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asm volatile ("lw $gp, %0" : : "m" (env[0].__gp));
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/* Get the callee-saved registers. */
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asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0]));
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asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1]));
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asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2]));
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asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3]));
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asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4]));
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asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5]));
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asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6]));
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asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7]));
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/* Get the PC. */
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asm volatile ("lw $25, %0" : : "m" (env[0].__pc));
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/* Restore the stack pointer and the FP. They have to be restored
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last and in a single asm as gcc, depending on options used, may
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use either of them to access env. */
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asm volatile ("lw $29, %0\n\t"
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"lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
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/* Give setjmp 1 if given a 0, or what they gave us if non-zero. */
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if (val == 0)
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asm volatile ("li $2, 1");
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else
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asm volatile ("move $2, %0" : : "r" (val));
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asm volatile ("jr $25");
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/* Avoid `volatile function does return' warnings. */
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for (;;);
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}
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/* Not using strong_alias because the nomips16 attribute cannot be
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copied from ____longjmp to __longjmp, because of the
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architecture-independent declaration of __longjmp without the
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attribute and compiler errors for such attributes not being the
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same on all declarations. */
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extern __typeof (____longjmp) __longjmp __attribute__ ((alias ("____longjmp")));
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