diff options
Diffstat (limited to 'lib/libc/powerpc64/gen/_ctx_start.S')
| -rw-r--r-- | lib/libc/powerpc64/gen/_ctx_start.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/lib/libc/powerpc64/gen/_ctx_start.S b/lib/libc/powerpc64/gen/_ctx_start.S new file mode 100644 index 000000000000..98225f9c1138 --- /dev/null +++ b/lib/libc/powerpc64/gen/_ctx_start.S @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2004 Suleiman Souhlal + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + + #include <machine/asm.h> + .globl CNAME(_ctx_done) + .globl CNAME(abort) + + ENTRY(_ctx_start) +#if !defined(_CALL_ELF) || _CALL_ELF == 1 + /* Load values from function descriptor */ + ld %r2,8(%r14) + ld %r14,0(%r14) +#else + /* + * The stack frame was already set up in makecontext(), + * so we can safely use the guaranteed fields here. + * + * Note we do step on the allocated stack frame's TOC, + * but since we never return from this function (i.e. + * never restore the stack frame) this should be safe. + */ + std %r2,24(%r1) /* save TOC */ + + /* Load global entry point */ + mr %r12,%r14 +#endif + mtlr %r14 + blrl /* branch to start function */ + mr %r3,%r15 /* pass pointer to ucontext as argument */ + nop +#if defined(_CALL_ELF) && _CALL_ELF != 1 + /* Restore TOC */ + ld %r2,24(%r1) +#endif + bl CNAME(_ctx_done) /* branch to ctxt completion func */ + /* + * we should never return from the + * above branch. + */ + nop + bl CNAME(abort) /* abort */ + nop + END(_ctx_start) + + .section .note.GNU-stack,"",%progbits |