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authorMichael Ellerman <mpe@ellerman.id.au>2015-03-28 06:35:16 -0400
committerMichael Ellerman <mpe@ellerman.id.au>2015-03-28 07:03:40 -0400
commit529d235a0e190ded1d21ccc80a73e625ebcad09b (patch)
treec807f7526f29b79a7ce0b233daf8a1c3030d8dd0 /arch/powerpc/include/uapi
parentc03e73740d24fbe990291cd9ac2d6ae0d95b975f (diff)
powerpc: Add a proper syscall for switching endianness
We currently have a "special" syscall for switching endianness. This is syscall number 0x1ebe, which is handled explicitly in the 64-bit syscall exception entry. That has a few problems, firstly the syscall number is outside of the usual range, which confuses various tools. For example strace doesn't recognise the syscall at all. Secondly it's handled explicitly as a special case in the syscall exception entry, which is complicated enough without it. As a first step toward removing the special syscall, we need to add a regular syscall that implements the same functionality. The logic is simple, it simply toggles the MSR_LE bit in the userspace MSR. This is the same as the special syscall, with the caveat that the special syscall clobbers fewer registers. This version clobbers r9-r12, XER, CTR, and CR0-1,5-7. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/uapi')
-rw-r--r--arch/powerpc/include/uapi/asm/unistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/uapi/asm/unistd.h b/arch/powerpc/include/uapi/asm/unistd.h
index ef5b5b1f3123..e4aa173dae62 100644
--- a/arch/powerpc/include/uapi/asm/unistd.h
+++ b/arch/powerpc/include/uapi/asm/unistd.h
@@ -385,5 +385,6 @@
385#define __NR_memfd_create 360 385#define __NR_memfd_create 360
386#define __NR_bpf 361 386#define __NR_bpf 361
387#define __NR_execveat 362 387#define __NR_execveat 362
388#define __NR_switch_endian 363
388 389
389#endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */ 390#endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */