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-rw-r--r--arch/microblaze/kernel/entry.S57
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):
293 swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ 293 swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
294 addi r14, r14, 4 /* return address is 4 byte after call */ 294 addi r14, r14, 4 /* return address is 4 byte after call */
295 295
296 mfs r1, rmsr
297 nop
298 andi r1, r1, MSR_UMS
299 bnei r1, 1f
300
301/* Kernel-mode state save - kernel execve */
302 lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
303 tophys(r1,r1);
304
305 addik r1, r1, -PT_SIZE; /* Make room on the stack. */
306 SAVE_REGS
307
308 swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */
309 brid 2f;
310 nop; /* Fill delay slot */
311
312/* User-mode state save. */
3131:
314 lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ 296 lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
315 tophys(r1,r1); 297 tophys(r1,r1);
316 lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ 298 lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */
@@ -460,18 +442,6 @@ TRAP_return: /* Make global symbol for debugging */
460 nop; 442 nop;
461 443
462 444
463/* These syscalls need access to the struct pt_regs on the stack, so we
464 implement them in assembly (they're basically all wrappers anyway). */
465
466C_ENTRY(sys_fork_wrapper):
467 addi r5, r0, SIGCHLD /* Arg 0: flags */
468 lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */
469 addik r7, r1, 0 /* Arg 2: parent context */
470 add r8, r0, r0 /* Arg 3: (unused) */
471 add r9, r0, r0; /* Arg 4: (unused) */
472 brid do_fork /* Do real work (tail-call) */
473 add r10, r0, r0; /* Arg 5: (unused) */
474
475/* This the initial entry point for a new child thread, with an appropriate 445/* This the initial entry point for a new child thread, with an appropriate
476 stack in place that makes it look the the child is in the middle of an 446 stack in place that makes it look the the child is in the middle of an
477 syscall. This function is actually `returned to' from switch_thread 447 syscall. This function is actually `returned to' from switch_thread
@@ -479,28 +449,19 @@ C_ENTRY(sys_fork_wrapper):
479 saved context). */ 449 saved context). */
480C_ENTRY(ret_from_fork): 450C_ENTRY(ret_from_fork):
481 bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ 451 bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
482 add r3, r5, r0; /* switch_thread returns the prev task */ 452 add r5, r3, r0; /* switch_thread returns the prev task */
483 /* ( in the delay slot ) */ 453 /* ( in the delay slot ) */
484 brid ret_from_trap; /* Do normal trap return */ 454 brid ret_from_trap; /* Do normal trap return */
485 add r3, r0, r0; /* Child's fork call should return 0. */ 455 add r3, r0, r0; /* Child's fork call should return 0. */
486 456
487C_ENTRY(sys_vfork): 457C_ENTRY(ret_from_kernel_thread):
488 brid microblaze_vfork /* Do real work (tail-call) */ 458 bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
489 addik r5, r1, 0 459 add r5, r3, r0; /* switch_thread returns the prev task */
490 460 /* ( in the delay slot ) */
491C_ENTRY(sys_clone): 461 brald r15, r20 /* fn was left in r20 */
492 bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ 462 addk r5, r0, r19 /* ... and argument - in r19 */
493 lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */ 463 brid ret_from_trap
4941: addik r7, r1, 0; /* Arg 2: parent context */ 464 add r3, r0, r0
495 lwi r9, r1, PT_R8; /* parent tid. */
496 lwi r10, r1, PT_R9; /* child tid. */
497 /* do_fork will pick up TLS from regs->r10. */
498 brid do_fork /* Do real work (tail-call) */
499 add r8, r0, r0; /* Arg 3: (unused) */
500
501C_ENTRY(sys_execve):
502 brid microblaze_execve; /* Do real work (tail-call).*/
503 addik r8, r1, 0; /* add user context as 4th arg */
504 465
505C_ENTRY(sys_rt_sigreturn_wrapper): 466C_ENTRY(sys_rt_sigreturn_wrapper):
506 brid sys_rt_sigreturn /* Do real work */ 467 brid sys_rt_sigreturn /* Do real work */