diff options
Diffstat (limited to 'arch/microblaze/kernel/entry.S')
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 46 |
1 files changed, 7 insertions, 39 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index 6c117ceaabea..bf6b2b122485 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -318,42 +318,23 @@ * are masked. This is nice, means we don't have to CLI before state save */ 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 */ + swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ - 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, -STATE_SAVE_SIZE; /* Make room on the stack. */ - SAVE_REGS - - swi r1, r1, PTO + 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 */ -/* calculate kernel stack pointer from task struct 8k */ - addik r1, r1, THREAD_SIZE; - tophys(r1,r1); - - addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ + /* MS these three instructions can be added to one */ + /* addik r1, r1, THREAD_SIZE; */ + /* tophys(r1,r1); */ + /* addik r1, r1, -STATE_SAVE_SIZE; */ + addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; SAVE_REGS - swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); swi r11, r1, PTO+PT_R1; /* Store user SP. */ clear_ums; -2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); + lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* Save away the syscall number. */ swi r12, r1, PTO+PT_R0; tovirt(r1,r1) @@ -423,9 +404,6 @@ C_ENTRY(ret_from_trap): swi r3, r1, PTO + PT_R3 swi r4, r1, PTO + PT_R4 - lwi r11, r1, PTO + PT_MODE; -/* See if returning to kernel mode, if so, skip resched &c. */ - bnei r11, 2f; /* We're returning to user mode, so check for various conditions that * trigger rescheduling. */ /* FIXME: Restructure all these flag checks. */ @@ -468,16 +446,6 @@ C_ENTRY(ret_from_trap): RESTORE_REGS; addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */ - bri 6f; - -/* Return to kernel state. */ -2: set_bip; /* Ints masked for state restore */ - VM_OFF; - tophys(r1,r1); - RESTORE_REGS; - addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ - tovirt(r1,r1); -6: TRAP_return: /* Make global symbol for debugging */ rtbd r14, 0; /* Instructions to return from an IRQ */ nop; |