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WSL2-Linux-Kernel
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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>
This commit is contained in:
Michal Simek 2010-06-22 16:39:56 +02:00
Родитель 06a54604a3
Коммит 77f6d22605
1 изменённых файлов: 10 добавлений и 15 удалений
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25
arch/microblaze/kernel/entry.S
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@ -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 */