aboutsummaryrefslogtreecommitdiff
path: root/arch/microblaze/kernel/entry.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/microblaze/kernel/entry.S')
-rw-r--r--arch/microblaze/kernel/entry.S138
1 files changed, 51 insertions, 87 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 66e34a3bfe1..0536bc021cc 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 */
@@ -372,6 +354,7 @@ C_ENTRY(_user_exception):
/* Note Microblaze barrel shift is optional, so don't rely on it */
add r12, r12, r12; /* convert num -> ptr */
add r12, r12, r12;
+ addi r30, r0, 1 /* restarts allowed */
#ifdef DEBUG
/* Trac syscalls and stored them to syscall_debug_table */
@@ -419,27 +402,27 @@ C_ENTRY(ret_from_trap):
* trigger rescheduling. */
/* get thread info from current task */
lwi r11, CURRENT_TASK, TS_THREAD_INFO;
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_NEED_RESCHED;
+ lwi r19, r11, TI_FLAGS; /* get flags in thread info */
+ andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
+ bri 1b
/* Maybe handle a signal */
-5: /* get thread info from current task*/
- lwi r11, CURRENT_TASK, TS_THREAD_INFO;
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_SIGPENDING;
- beqi r11, 1f; /* Signals to handle, handle them */
+5:
+ andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
+ beqi r11, 4f; /* Signals to handle, handle them */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
- addi r7, r0, 1; /* Arg 3: int in_syscall */
- bralid r15, do_signal; /* Handle any signals */
- add r6, r0, r0; /* Arg 2: sigset_t *oldset */
+ bralid r15, do_notify_resume; /* Handle any signals */
+ add r6, r30, r0; /* Arg 2: int in_syscall */
+ add r30, r0, r0 /* no more restarts */
+ bri 1b
/* Finally, return to user state. */
-1: set_bip; /* Ints masked for state restore */
+4: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
@@ -461,18 +444,6 @@ 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
@@ -480,29 +451,22 @@ 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 */
- 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) */
-
-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):
+ addik r30, r0, 0 /* no restarts */
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */
@@ -610,20 +574,20 @@ C_ENTRY(ret_from_exc):
/* We're returning to user mode, so check for various conditions that
trigger rescheduling. */
+1:
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_NEED_RESCHED;
+ lwi r19, r11, TI_FLAGS; /* get flags in thread info */
+ andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
/* Call the scheduler before returning from a syscall/trap. */
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
+ bri 1b
/* Maybe handle a signal */
-5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_SIGPENDING;
- beqi r11, 1f; /* Signals to handle, handle them */
+5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
+ beqi r11, 4f; /* Signals to handle, handle them */
/*
* Handle a signal return; Pending signals should be in r18.
@@ -635,14 +599,14 @@ C_ENTRY(ret_from_exc):
* traps), but signal handlers may want to examine or change the
* complete register state. Here we save anything not saved by
* the normal entry sequence, so that it may be safely restored
- * (in a possibly modified form) after do_signal returns. */
+ * (in a possibly modified form) after do_notify_resume returns. */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
- addi r7, r0, 0; /* Arg 3: int in_syscall */
- bralid r15, do_signal; /* Handle any signals */
- add r6, r0, r0; /* Arg 2: sigset_t *oldset */
+ bralid r15, do_notify_resume; /* Handle any signals */
+ addi r6, r0, 0; /* Arg 2: int in_syscall */
+ bri 1b
/* Finally, return to user state. */
-1: set_bip; /* Ints masked for state restore */
+4: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
@@ -722,23 +686,23 @@ ret_from_irq:
lwi r11, r1, PT_MODE;
bnei r11, 2f;
+1:
lwi r11, CURRENT_TASK, TS_THREAD_INFO;
- lwi r11, r11, TI_FLAGS; /* MS: get flags from thread info */
- andi r11, r11, _TIF_NEED_RESCHED;
+ lwi r19, r11, TI_FLAGS; /* MS: get flags from thread info */
+ andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f
bralid r15, schedule;
nop; /* delay slot */
+ bri 1b
/* Maybe handle a signal */
-5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* MS: get thread info */
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_SIGPENDING;
+5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
beqid r11, no_intr_resched
/* Handle a signal return; Pending signals should be in r18. */
- addi r7, r0, 0; /* Arg 3: int in_syscall */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
- bralid r15, do_signal; /* Handle any signals */
- add r6, r0, r0; /* Arg 2: sigset_t *oldset */
+ bralid r15, do_notify_resume; /* Handle any signals */
+ addi r6, r0, 0; /* Arg 2: int in_syscall */
+ bri 1b
/* Finally, return to user state. */
no_intr_resched:
@@ -856,29 +820,29 @@ dbtrap_call: /* Return point for kernel/user entry + 8 because of rtsd r15, 8 */
lwi r11, r1, PT_MODE;
bnei r11, 2f;
/* MS: Return to user space - gdb */
+1:
/* Get current task ptr into r11 */
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_NEED_RESCHED;
+ lwi r19, r11, TI_FLAGS; /* get flags in thread info */
+ andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
/* Call the scheduler before returning from a syscall/trap. */
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
+ bri 1b
/* Maybe handle a signal */
-5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
- lwi r11, r11, TI_FLAGS; /* get flags in thread info */
- andi r11, r11, _TIF_SIGPENDING;
- beqi r11, 1f; /* Signals to handle, handle them */
+5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
+ beqi r11, 4f; /* Signals to handle, handle them */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
- addi r7, r0, 0; /* Arg 3: int in_syscall */
- bralid r15, do_signal; /* Handle any signals */
- add r6, r0, r0; /* Arg 2: sigset_t *oldset */
+ bralid r15, do_notify_resume; /* Handle any signals */
+ addi r6, r0, 0; /* Arg 2: int in_syscall */
+ bri 1b
/* Finally, return to user state. */
-1: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
+4: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
/* MS: Restore all regs */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 14:52:11 +0000