Little endian ppc64 is getting an exciting new ABI. This is reflected
by the bottom two bits of e_flags in the ELF header:
0 == legacy binaries (v1 ABI)
1 == binaries using the old ABI (compiled with a new toolchain)
2 == binaries using the new ABI.
We store this in a thread flag, because we need to set it in core
dumps and for signal delivery. Our chief concern is that it doesn't
use function descriptors.
Signed-off-by: Rusty Russell <ru...@rustcorp.com.au>
---
arch/powerpc/include/asm/elf.h | 4 ++++
arch/powerpc/include/asm/thread_info.h | 9 +++++++++
2 files changed, 13 insertions(+)
diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
index ac6ec6e..54c7445 100644
--- a/arch/powerpc/include/asm/elf.h
+++ b/arch/powerpc/include/asm/elf.h
@@ -85,6 +85,8 @@ typedef elf_vrregset_t elf_fpxregset_t;
# ifdef CONFIG_COMPAT
# define SET_PERSONALITY(ex) \
do { \
+ if (((ex).e_flags & 0x3) == 2) \
+ set_thread_flag(TIF_ELF2ABI); \
if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
set_thread_flag(TIF_32BIT); \
else \
@@ -96,6 +98,8 @@ do {
\
# else /* !COMPAT: */
# define SET_PERSONALITY(ex) \
do { \
+ if (((ex).e_flags & 0x3) == 2) \
+ set_thread_flag(TIF_ELF2ABI); \
if (personality(current->personality) != PER_LINUX32) \
set_personality(PER_LINUX | \
(current->personality & (~PER_MASK))); \
diff --git a/arch/powerpc/include/asm/thread_info.h
b/arch/powerpc/include/asm/thread_info.h
index f66c2c1..460326f 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -109,6 +109,9 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
for stack store? */
#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
+#if defined(CONFIG_PPC64)
+#define TIF_ELF2ABI 18 /* function descriptors must die! */
+#endif
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -193,6 +196,12 @@ static inline bool test_thread_local_flags(unsigned int
flags)
#define is_32bit_task() (1)
#endif
+#if defined(CONFIG_PPC64)
+#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
+#else
+#define is_elf2_task() (0)
+#endif
+
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */
--
1.8.3.2
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
