diff options
Diffstat (limited to 'arch/microblaze/kernel/entry.S')
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 57 |
1 files changed, 9 insertions, 48 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index 03f7b8ce6b6b..c217367dfc7b 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -293,24 +293,6 @@ C_ENTRY(_user_exception): swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ addi r14, r14, 4 /* return address is 4 byte after call */ - mfs r1, rmsr - nop - andi r1, r1, MSR_UMS - bnei r1, 1f - -/* Kernel-mode state save - kernel execve */ - lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ - tophys(r1,r1); - - addik r1, r1, -PT_SIZE; /* Make room on the stack. */ - SAVE_REGS - - swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */ - brid 2f; - nop; /* Fill delay slot */ - -/* User-mode state save. */ -1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ tophys(r1,r1); lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ @@ -460,18 +442,6 @@ TRAP_return: /* Make global symbol for debugging */ nop; -/* These syscalls need access to the struct pt_regs on the stack, so we - implement them in assembly (they're basically all wrappers anyway). */ - -C_ENTRY(sys_fork_wrapper): - addi r5, r0, SIGCHLD /* Arg 0: flags */ - lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */ - addik r7, r1, 0 /* Arg 2: parent context */ - add r8, r0, r0 /* Arg 3: (unused) */ - add r9, r0, r0; /* Arg 4: (unused) */ - brid do_fork /* Do real work (tail-call) */ - add r10, r0, r0; /* Arg 5: (unused) */ - /* This the initial entry point for a new child thread, with an appropriate stack in place that makes it look the the child is in the middle of an syscall. This function is actually `returned to' from switch_thread @@ -479,28 +449,19 @@ C_ENTRY(sys_fork_wrapper): saved context). */ C_ENTRY(ret_from_fork): bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ - add r3, r5, r0; /* switch_thread returns the prev task */ + add r5, r3, r0; /* switch_thread returns the prev task */ /* ( in the delay slot ) */ brid ret_from_trap; /* Do normal trap return */ add r3, r0, r0; /* Child's fork call should return 0. */ -C_ENTRY(sys_vfork): - brid microblaze_vfork /* Do real work (tail-call) */ - addik r5, r1, 0 - -C_ENTRY(sys_clone): - bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ - lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */ -1: addik r7, r1, 0; /* Arg 2: parent context */ - lwi r9, r1, PT_R8; /* parent tid. */ - lwi r10, r1, PT_R9; /* child tid. */ - /* do_fork will pick up TLS from regs->r10. */ - brid do_fork /* Do real work (tail-call) */ - add r8, r0, r0; /* Arg 3: (unused) */ - -C_ENTRY(sys_execve): - brid microblaze_execve; /* Do real work (tail-call).*/ - addik r8, r1, 0; /* add user context as 4th arg */ +C_ENTRY(ret_from_kernel_thread): + bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ + add r5, r3, r0; /* switch_thread returns the prev task */ + /* ( in the delay slot ) */ + brald r15, r20 /* fn was left in r20 */ + addk r5, r0, r19 /* ... and argument - in r19 */ + brid ret_from_trap + add r3, r0, r0 C_ENTRY(sys_rt_sigreturn_wrapper): brid sys_rt_sigreturn /* Do real work */ |