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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-09-30 01:28:52 +0200 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-09-30 01:28:52 +0200 |
| commit | 8f697e574012cc73b6b0dcbf30d88a3a0f43b78f (patch) | |
| tree | a6b16bcf33ad08e03837b61eed2fffb31118f1f3 /arch/powerpc/kernel/entry_64.S | |
| parent | Input: walkera0701 - use parallel port device model (diff) | |
| parent | Linux 4.3-rc3 (diff) | |
| download | linux-8f697e574012cc73b6b0dcbf30d88a3a0f43b78f.tar.xz linux-8f697e574012cc73b6b0dcbf30d88a3a0f43b78f.zip | |
Merge tag 'v4.3-rc3' into next
Merge with Linux 4.3-rc3 to bring in MFD DA9062 changes to merge DA9062
OnKey driver.
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 579e0f9a2d57..a94f155db78e 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -19,6 +19,7 @@ */ #include <linux/errno.h> +#include <linux/err.h> #include <asm/unistd.h> #include <asm/processor.h> #include <asm/page.h> @@ -150,8 +151,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR) CURRENT_THREAD_INFO(r11, r1) ld r10,TI_FLAGS(r11) andi. r11,r10,_TIF_SYSCALL_DOTRACE - bne syscall_dotrace -.Lsyscall_dotrace_cont: + bne syscall_dotrace /* does not return */ cmpldi 0,r0,NR_syscalls bge- syscall_enosys @@ -207,7 +207,7 @@ system_call: /* label this so stack traces look sane */ #endif /* CONFIG_PPC_BOOK3E */ ld r9,TI_FLAGS(r12) - li r11,-_LAST_ERRNO + li r11,-MAX_ERRNO andi. r0,r9,(_TIF_SYSCALL_DOTRACE|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK) bne- syscall_exit_work cmpld r3,r11 @@ -245,22 +245,34 @@ syscall_dotrace: bl save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl do_syscall_trace_enter + /* - * Restore argument registers possibly just changed. - * We use the return value of do_syscall_trace_enter - * for the call number to look up in the table (r0). + * We use the return value of do_syscall_trace_enter() as the syscall + * number. If the syscall was rejected for any reason do_syscall_trace_enter() + * returns an invalid syscall number and the test below against + * NR_syscalls will fail. */ mr r0,r3 + + /* Restore argument registers just clobbered and/or possibly changed. */ ld r3,GPR3(r1) ld r4,GPR4(r1) ld r5,GPR5(r1) ld r6,GPR6(r1) ld r7,GPR7(r1) ld r8,GPR8(r1) + + /* Repopulate r9 and r10 for the system_call path */ addi r9,r1,STACK_FRAME_OVERHEAD CURRENT_THREAD_INFO(r10, r1) ld r10,TI_FLAGS(r10) - b .Lsyscall_dotrace_cont + + cmpldi r0,NR_syscalls + blt+ system_call + + /* Return code is already in r3 thanks to do_syscall_trace_enter() */ + b .Lsyscall_exit + syscall_enosys: li r3,-ENOSYS @@ -277,7 +289,7 @@ syscall_exit_work: beq+ 0f REST_NVGPRS(r1) b 2f -0: cmpld r3,r11 /* r10 is -LAST_ERRNO */ +0: cmpld r3,r11 /* r11 is -MAX_ERRNO */ blt+ 1f andi. r0,r9,_TIF_NOERROR bne- 1f |