diff options
| author | Anton Blanchard <anton@samba.org> | 2014-02-04 16:08:51 +1100 |
|---|---|---|
| committer | Anton Blanchard <anton@samba.org> | 2014-04-23 10:05:23 +1000 |
| commit | 7cedd6014bfe353d4b552ed8d54d63f6e06e26ba (patch) | |
| tree | e65291b54d3de8d90c370581d776dbb4d2aafe05 | |
| parent | b86206e4c32cbe6ac3de1c6dc52c2d64bcf461cb (diff) | |
powerpc: Fix kernel thread creation on ABIv2
Change how we setup registers for ret_from_kernel_thread. In
ABIv1, instead of passing a function descriptor in, dereference
it and pass the target in directly.
Use ppc_global_function_entry to get it right on both ABIv1 and ABIv2.
Signed-off-by: Anton Blanchard <anton@samba.org>
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 4 | ||||
| -rw-r--r-- | arch/powerpc/kernel/process.c | 17 |
2 files changed, 8 insertions, 13 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index d23d7526d37..cf4f6e69343 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -378,9 +378,11 @@ _GLOBAL(ret_from_fork) _GLOBAL(ret_from_kernel_thread) bl schedule_tail REST_NVGPRS(r1) - ld r14, 0(r14) mtlr r14 mr r3,r15 +#if defined(_CALL_ELF) && _CALL_ELF == 2 + mr r12,r14 +#endif blrl li r3,0 b syscall_exit diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 31d021506d2..2ae1b99166c 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -54,6 +54,7 @@ #ifdef CONFIG_PPC64 #include <asm/firmware.h> #endif +#include <asm/code-patching.h> #include <linux/kprobes.h> #include <linux/kdebug.h> @@ -1108,7 +1109,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, struct thread_info *ti = (void *)task_stack_page(p); memset(childregs, 0, sizeof(struct pt_regs)); childregs->gpr[1] = sp + sizeof(struct pt_regs); - childregs->gpr[14] = usp; /* function */ + /* function */ + if (usp) + childregs->gpr[14] = ppc_function_entry((void *)usp); #ifdef CONFIG_PPC64 clear_tsk_thread_flag(p, TIF_32BIT); childregs->softe = 1; @@ -1187,17 +1190,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, if (cpu_has_feature(CPU_FTR_HAS_PPR)) p->thread.ppr = INIT_PPR; #endif - /* - * The PPC64 ABI makes use of a TOC to contain function - * pointers. The function (ret_from_except) is actually a pointer - * to the TOC entry. The first entry is a pointer to the actual - * function. - */ -#ifdef CONFIG_PPC64 - kregs->nip = *((unsigned long *)f); -#else - kregs->nip = (unsigned long)f; -#endif + kregs->nip = ppc_function_entry(f); return 0; } |