diff options
Diffstat (limited to 'arch/openrisc/kernel/entry.S')
-rw-r--r-- | arch/openrisc/kernel/entry.S | 30 |
1 files changed, 10 insertions, 20 deletions
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index 374e63e7c9f6..dce86aef8aba 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S | |||
@@ -894,6 +894,16 @@ ENTRY(ret_from_fork) | |||
894 | l.jal schedule_tail | 894 | l.jal schedule_tail |
895 | l.nop | 895 | l.nop |
896 | 896 | ||
897 | /* Check if we are a kernel thread */ | ||
898 | l.sfeqi r20,0 | ||
899 | l.bf 1f | ||
900 | l.nop | ||
901 | |||
902 | /* ...we are a kernel thread so invoke the requested callback */ | ||
903 | l.jalr r20 | ||
904 | l.or r3,r22,r0 | ||
905 | |||
906 | 1: | ||
897 | /* _syscall_returns expect r11 to contain return value */ | 907 | /* _syscall_returns expect r11 to contain return value */ |
898 | l.lwz r11,PT_GPR11(r1) | 908 | l.lwz r11,PT_GPR11(r1) |
899 | 909 | ||
@@ -915,26 +925,6 @@ ENTRY(ret_from_fork) | |||
915 | l.j _syscall_return | 925 | l.j _syscall_return |
916 | l.nop | 926 | l.nop |
917 | 927 | ||
918 | /* Since syscalls don't save call-clobbered registers, the args to | ||
919 | * kernel_thread_helper will need to be passed through callee-saved | ||
920 | * registers and copied to the parameter registers when the thread | ||
921 | * begins running. | ||
922 | * | ||
923 | * See arch/openrisc/kernel/process.c: | ||
924 | * The args are passed as follows: | ||
925 | * arg1 (r3) : passed in r20 | ||
926 | * arg2 (r4) : passed in r22 | ||
927 | */ | ||
928 | |||
929 | ENTRY(_kernel_thread_helper) | ||
930 | l.or r3,r20,r0 | ||
931 | l.or r4,r22,r0 | ||
932 | l.movhi r31,hi(kernel_thread_helper) | ||
933 | l.ori r31,r31,lo(kernel_thread_helper) | ||
934 | l.jr r31 | ||
935 | l.nop | ||
936 | |||
937 | |||
938 | /* ========================================================[ switch ] === */ | 928 | /* ========================================================[ switch ] === */ |
939 | 929 | ||
940 | /* | 930 | /* |