diff options
Diffstat (limited to 'lib/libc/powerpc64')
| -rw-r--r-- | lib/libc/powerpc64/gen/_ctx_start.S | 14 | ||||
| -rw-r--r-- | lib/libc/powerpc64/gen/makecontext.c | 3 |
2 files changed, 16 insertions, 1 deletions
diff --git a/lib/libc/powerpc64/gen/_ctx_start.S b/lib/libc/powerpc64/gen/_ctx_start.S index c2f8abfd6486..98225f9c1138 100644 --- a/lib/libc/powerpc64/gen/_ctx_start.S +++ b/lib/libc/powerpc64/gen/_ctx_start.S @@ -34,6 +34,16 @@ 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 @@ -41,6 +51,10 @@ 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 diff --git a/lib/libc/powerpc64/gen/makecontext.c b/lib/libc/powerpc64/gen/makecontext.c index 75c2d40bdd60..9e3a976fa1bd 100644 --- a/lib/libc/powerpc64/gen/makecontext.c +++ b/lib/libc/powerpc64/gen/makecontext.c @@ -78,7 +78,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...) */ stackargs = (argc > 8) ? argc - 8 : 0; sp = (char *) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size - - sizeof(uintptr_t)*(stackargs + 2); + - sizeof(uintptr_t)*(stackargs + 6); sp = (char *)((uintptr_t)sp & ~0x1f); mc = &ucp->uc_mcontext; @@ -119,6 +119,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...) mc->mc_srr0 = *(uintptr_t *)_ctx_start; #else mc->mc_srr0 = (uintptr_t) _ctx_start; + mc->mc_gpr[12] = (uintptr_t) _ctx_start;/* required for prologue */ #endif mc->mc_gpr[1] = (uintptr_t) sp; /* new stack pointer */ mc->mc_gpr[14] = (uintptr_t) start; /* r14 <- start */ |