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| author | Michal Simek <monstr@monstr.eu> | 2010-06-22 16:39:56 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2010-08-04 10:22:53 +0200 |
| commit | 77f6d226050e2d8f046e268a9f84ec834172f0de (patch) | |
| tree | 1f4f80974504eebab50d231d438ae61fb48f4afc /arch/microblaze | |
| parent | 06a54604a31f06715a393a4fdd099b03611cce10 (diff) | |
| download | linux-77f6d226050e2d8f046e268a9f84ec834172f0de.tar.gz linux-77f6d226050e2d8f046e268a9f84ec834172f0de.tar.bz2 linux-77f6d226050e2d8f046e268a9f84ec834172f0de.zip | |
microblaze: Remove additional setup for kernel_mode
PT_MODE stores information if kernel comes from user
or kernel space. If come from user space, PT_MODE
contains 0. If come from kernel store, PT_MODE contains
non zero value. We don't need to save value 1. I am using
r1 register which contains non zero value.
This change save one additional instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index aa611cd35042..5318ad375fec 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -286,8 +286,7 @@ C_ENTRY(_user_exception): addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ SAVE_REGS - addi r11, r0, 1; /* Was in kernel-mode. */ - swi r11, r1, PTO+PT_MODE; /* pt_regs -> kernel mode */ + swi r1, r1, PTO + PT_MODE; /* pt_regs -> kernel mode */ brid 2f; nop; /* Fill delay slot */ @@ -303,7 +302,7 @@ C_ENTRY(_user_exception): addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ SAVE_REGS - swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ + 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. */ 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); @@ -380,7 +379,7 @@ C_ENTRY(ret_from_trap): swi r3, r1, PTO + PT_R3 swi r4, r1, PTO + PT_R4 - lwi r11, r1, PTO+PT_MODE; + 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 @@ -513,8 +512,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper): tophys(r1,r1); \ addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\ SAVE_REGS \ - addi r11, r0, 1; /* Was in kernel-mode. */ \ - swi r11, r1, PTO+PT_MODE; \ + swi r1, r1, PTO+PT_MODE; \ brid 2f; \ nop; /* Fill delay slot */ \ 1: /* User-mode state save. */ \ @@ -525,7 +523,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper): tophys(r1,r1); \ addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\ SAVE_REGS \ - swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ \ + 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. */ \ 2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); @@ -645,7 +643,7 @@ C_ENTRY(page_fault_instr_trap): /* Entry point used to return from an exception. */ C_ENTRY(ret_from_exc): - lwi r11, r1, PTO+PT_MODE; + lwi r11, r1, PTO + PT_MODE; bnei r11, 2f; /* See if returning to kernel mode, */ /* ... if so, skip resched &c. */ @@ -733,9 +731,7 @@ C_ENTRY(_interrupt): /* MS: Make room on the stack -> activation record */ addik r1, r1, -STATE_SAVE_SIZE; SAVE_REGS - /* MS: store mode */ - addi r11, r0, 1; /* MS: Was in kernel-mode. */ - swi r11, r1, PTO + PT_MODE; /* MS: and save it */ + swi r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */ brid 2f; nop; /* MS: Fill delay slot */ @@ -852,8 +848,7 @@ C_ENTRY(_debug_exception): addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ SAVE_REGS; - addi r11, r0, 1; /* Was in kernel-mode. */ - swi r11, r1, PTO + PT_MODE; + swi r1, r1, PTO + PT_MODE; brid 2f; nop; /* Fill delay slot */ 1: /* User-mode state save. */ @@ -866,7 +861,7 @@ C_ENTRY(_debug_exception): addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ SAVE_REGS; - swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ + 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. */ 2: @@ -880,7 +875,7 @@ dbtrap_call: rtbd r0, send_sig; addik r15, r0, dbtrap_call; set_bip; /* Ints masked for state restore*/ - lwi r11, r1, PTO+PT_MODE; + lwi r11, r1, PTO + PT_MODE; bnei r11, 2f; /* Get current task ptr into r11 */ |