[PATCHv2] powerpc: Define and use PPC64_ELF_ABI_v2
Naveen N. Rao
naveen.n.rao at linux.vnet.ibm.com
Sun Jun 5 02:55:37 AEST 2016
From: Michael Ellerman <mpe at ellerman.id.au>
We're approaching 20 locations where we need to check for ELF ABI v2.
That's fine, except the logic is a bit awkward, because we have to check
that _CALL_ELF is defined and then what its value is.
So check it once in asm/types.h and define PPC64_ELF_ABI_v2 when ELF ABI
v2 is detected.
We don't add explicit includes of asm/types.h because it's included
basically everywhere via compiler.h.
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
[changed name to PPC64_ELF_ABI_v2, added check for __powerpc64__, fixes]
Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
---
Michael,
I tested this today, and ended up updating it with the below changes:
- included __powerpc64__ in the check for setting the flag since ABIv2
is ppc64 specific.
- renamed flag to PPC64_ELF_ABI_v2 to convey the same.
- fixed the incorrect change in ftrace.h
- converted an additional change in ftrace.c
- Naveen
arch/powerpc/include/asm/code-patching.h | 6 +++---
arch/powerpc/include/asm/ftrace.h | 2 +-
arch/powerpc/include/asm/kprobes.h | 4 ++--
arch/powerpc/include/asm/linkage.h | 2 +-
arch/powerpc/include/asm/ppc_asm.h | 4 ++--
arch/powerpc/include/asm/ptrace.h | 2 +-
arch/powerpc/include/asm/sections.h | 2 +-
arch/powerpc/include/asm/types.h | 4 ++++
arch/powerpc/kernel/entry_64.S | 2 +-
arch/powerpc/kernel/ftrace.c | 4 ++--
arch/powerpc/kernel/head_64.S | 2 +-
arch/powerpc/kernel/kprobes.c | 2 +-
arch/powerpc/kernel/misc_64.S | 2 +-
arch/powerpc/kernel/module_64.c | 4 ++--
arch/powerpc/kvm/book3s_interrupts.S | 2 +-
arch/powerpc/kvm/book3s_rmhandlers.S | 2 +-
16 files changed, 25 insertions(+), 21 deletions(-)
diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h
index 994c60a..9da8ec0 100644
--- a/arch/powerpc/include/asm/code-patching.h
+++ b/arch/powerpc/include/asm/code-patching.h
@@ -50,7 +50,7 @@ void __patch_exception(int exc, unsigned long addr);
static inline unsigned long ppc_function_entry(void *func)
{
#if defined(CONFIG_PPC64)
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
u32 *insn = func;
/*
@@ -90,7 +90,7 @@ static inline unsigned long ppc_function_entry(void *func)
static inline unsigned long ppc_global_function_entry(void *func)
{
-#if defined(CONFIG_PPC64) && defined(_CALL_ELF) && _CALL_ELF == 2
+#if defined(CONFIG_PPC64) && defined(PPC64_ELF_ABI_v2)
/* PPC64 ABIv2 the global entry point is at the address */
return (unsigned long)func;
#else
@@ -106,7 +106,7 @@ static inline unsigned long ppc_global_function_entry(void *func)
*/
/* This must match the definition of STK_GOT in <asm/ppc_asm.h> */
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define R2_STACK_OFFSET 24
#else
#define R2_STACK_OFFSET 40
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index 50ca758..0eace29 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -66,7 +66,7 @@ struct dyn_arch_ftrace {
#endif
#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__ASSEMBLY__)
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h
index 039b583..0174642 100644
--- a/arch/powerpc/include/asm/kprobes.h
+++ b/arch/powerpc/include/asm/kprobes.h
@@ -41,7 +41,7 @@ typedef ppc_opcode_t kprobe_opcode_t;
#define MAX_INSN_SIZE 1
#ifdef CONFIG_PPC64
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
/* PPC64 ABIv2 needs local entry point */
#define kprobe_lookup_name(name, addr) \
{ \
@@ -92,7 +92,7 @@ typedef ppc_opcode_t kprobe_opcode_t;
addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
} \
}
-#endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */
+#endif /* PPC64_ELF_ABI_v2 */
#endif /* CONFIG_PPC64 */
#define flush_insn_slot(p) do { } while (0)
diff --git a/arch/powerpc/include/asm/linkage.h b/arch/powerpc/include/asm/linkage.h
index e3ad5c7..dbaa53b 100644
--- a/arch/powerpc/include/asm/linkage.h
+++ b/arch/powerpc/include/asm/linkage.h
@@ -2,7 +2,7 @@
#define _ASM_POWERPC_LINKAGE_H
#ifdef CONFIG_PPC64
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
#define cond_syscall(x) \
asm ("\t.weak " #x "\n\t.set " #x ", sys_ni_syscall\n" \
"\t.weak ." #x "\n\t.set ." #x ", .sys_ni_syscall\n")
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 2b31632..7b591f9 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -189,7 +189,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
#define __STK_REG(i) (112 + ((i)-14)*8)
#define STK_REG(i) __STK_REG(__REG_##i)
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define STK_GOT 24
#define __STK_PARAM(i) (32 + ((i)-3)*8)
#else
@@ -198,7 +198,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
#endif
#define STK_PARAM(i) __STK_PARAM(__REG_##i)
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define _GLOBAL(name) \
.section ".text"; \
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index c0c61fa..e492368 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -47,7 +47,7 @@
STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
#define STACK_FRAME_MARKER 12
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define STACK_FRAME_MIN_SIZE 32
#else
#define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
index abf5866..57f069f 100644
--- a/arch/powerpc/include/asm/sections.h
+++ b/arch/powerpc/include/asm/sections.h
@@ -62,7 +62,7 @@ static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
#endif
}
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
#undef dereference_function_descriptor
static inline void *dereference_function_descriptor(void *ptr)
{
diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
index bfb6ded..68b12a8 100644
--- a/arch/powerpc/include/asm/types.h
+++ b/arch/powerpc/include/asm/types.h
@@ -15,6 +15,10 @@
#include <uapi/asm/types.h>
+#if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2
+#define PPC64_ELF_ABI_v2
+#endif
+
#ifndef __ASSEMBLY__
typedef __vector128 vector128;
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 73e461a..2e0c565 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -453,7 +453,7 @@ _GLOBAL(ret_from_kernel_thread)
REST_NVGPRS(r1)
mtlr r14
mr r3,r15
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
mr r12,r14
#endif
blrl
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 1123a4d..d91ac40 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -608,7 +608,7 @@ unsigned long __init arch_syscall_addr(int nr)
}
#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 */
-#if defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF != 2)
+#if defined(CONFIG_PPC64) && !defined(PPC64_ELF_ABI_v2)
char *arch_ftrace_match_adjust(char *str, const char *search)
{
if (str[0] == '.' && search[0] != '.')
@@ -616,4 +616,4 @@ char *arch_ftrace_match_adjust(char *str, const char *search)
else
return str;
}
-#endif /* defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF != 2) */
+#endif /* defined(CONFIG_PPC64) && !defined(PPC64_ELF_ABI_v2) */
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 2d14774..21a871f 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -401,7 +401,7 @@ generic_secondary_common_init:
ld r12,CPU_SPEC_RESTORE(r23)
cmpdi 0,r12,0
beq 3f
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
ld r12,0(r12)
#endif
mtctr r12
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 7c053f2..a4a3bc8 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -507,7 +507,7 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
/* setup return addr to the jprobe handler routine */
regs->nip = arch_deref_entry_point(jp->entry);
#ifdef CONFIG_PPC64
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
regs->gpr[12] = (unsigned long)jp->entry;
#else
regs->gpr[2] = (unsigned long)(((func_descr_t *)jp->entry)->toc);
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index f28754c..72d540f 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -661,7 +661,7 @@ _GLOBAL(kexec_sequence)
#ifndef CONFIG_PPC_BOOK3E
/* clear out hardware hash page table and tlb */
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
ld r12,0(r27) /* deref function descriptor */
#else
mr r12,r27
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 9ce9a25..cd3d7f4 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -41,7 +41,7 @@
this, and makes other things simpler. Anton?
--RR. */
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
/* An address is simply the address of the function. */
typedef unsigned long func_desc_t;
@@ -132,7 +132,7 @@ static u32 ppc64_stub_insns[] = {
/* Save current r2 value in magic place on the stack. */
0xf8410000|R2_STACK_OFFSET, /* std r2,R2_STACK_OFFSET(r1) */
0xe98b0020, /* ld r12,32(r11) */
-#if !defined(_CALL_ELF) || _CALL_ELF != 2
+#ifndef PPC64_ELF_ABI_v2
/* Set up new r2 from function descriptor */
0xe84b0028, /* ld r2,40(r11) */
#endif
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S
index d044b8b..901e6fe 100644
--- a/arch/powerpc/kvm/book3s_interrupts.S
+++ b/arch/powerpc/kvm/book3s_interrupts.S
@@ -25,7 +25,7 @@
#include <asm/exception-64s.h>
#if defined(CONFIG_PPC_BOOK3S_64)
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define FUNC(name) name
#else
#define FUNC(name) GLUE(.,name)
diff --git a/arch/powerpc/kvm/book3s_rmhandlers.S b/arch/powerpc/kvm/book3s_rmhandlers.S
index 16c4d88..42a4b23 100644
--- a/arch/powerpc/kvm/book3s_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_rmhandlers.S
@@ -36,7 +36,7 @@
#if defined(CONFIG_PPC_BOOK3S_64)
-#if defined(_CALL_ELF) && _CALL_ELF == 2
+#ifdef PPC64_ELF_ABI_v2
#define FUNC(name) name
#else
#define FUNC(name) GLUE(.,name)
--
2.8.2
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