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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>
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06a54604a3
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@ -286,8 +286,7 @@ C_ENTRY(_user_exception):
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
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SAVE_REGS
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addi r11, r0, 1; /* Was in kernel-mode. */
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swi r11, r1, PTO+PT_MODE; /* pt_regs -> kernel mode */
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swi r1, r1, PTO + PT_MODE; /* pt_regs -> kernel mode */
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brid 2f;
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nop; /* Fill delay slot */
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@ -303,7 +302,7 @@ C_ENTRY(_user_exception):
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
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SAVE_REGS
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swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */
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swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */
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lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
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swi r11, r1, PTO+PT_R1; /* Store user SP. */
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2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
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@ -380,7 +379,7 @@ C_ENTRY(ret_from_trap):
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swi r3, r1, PTO + PT_R3
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swi r4, r1, PTO + PT_R4
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lwi r11, r1, PTO+PT_MODE;
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lwi r11, r1, PTO + PT_MODE;
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/* See if returning to kernel mode, if so, skip resched &c. */
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bnei r11, 2f;
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/* We're returning to user mode, so check for various conditions that
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@ -513,8 +512,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
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tophys(r1,r1); \
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\
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SAVE_REGS \
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addi r11, r0, 1; /* Was in kernel-mode. */ \
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swi r11, r1, PTO+PT_MODE; \
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swi r1, r1, PTO+PT_MODE; \
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brid 2f; \
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nop; /* Fill delay slot */ \
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1: /* User-mode state save. */ \
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@ -525,7 +523,7 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
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tophys(r1,r1); \
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\
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SAVE_REGS \
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swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ \
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swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ \
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lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
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swi r11, r1, PTO+PT_R1; /* Store user SP. */ \
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2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
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@ -645,7 +643,7 @@ C_ENTRY(page_fault_instr_trap):
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/* Entry point used to return from an exception. */
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C_ENTRY(ret_from_exc):
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lwi r11, r1, PTO+PT_MODE;
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lwi r11, r1, PTO + PT_MODE;
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bnei r11, 2f; /* See if returning to kernel mode, */
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/* ... if so, skip resched &c. */
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@ -733,9 +731,7 @@ C_ENTRY(_interrupt):
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/* MS: Make room on the stack -> activation record */
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addik r1, r1, -STATE_SAVE_SIZE;
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SAVE_REGS
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/* MS: store mode */
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addi r11, r0, 1; /* MS: Was in kernel-mode. */
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swi r11, r1, PTO + PT_MODE; /* MS: and save it */
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swi r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */
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brid 2f;
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nop; /* MS: Fill delay slot */
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@ -852,8 +848,7 @@ C_ENTRY(_debug_exception):
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
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SAVE_REGS;
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addi r11, r0, 1; /* Was in kernel-mode. */
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swi r11, r1, PTO + PT_MODE;
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swi r1, r1, PTO + PT_MODE;
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brid 2f;
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nop; /* Fill delay slot */
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1: /* User-mode state save. */
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@ -866,7 +861,7 @@ C_ENTRY(_debug_exception):
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addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
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SAVE_REGS;
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swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */
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swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */
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lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
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swi r11, r1, PTO+PT_R1; /* Store user SP. */
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2:
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@ -880,7 +875,7 @@ dbtrap_call: rtbd r0, send_sig;
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addik r15, r0, dbtrap_call;
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set_bip; /* Ints masked for state restore*/
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lwi r11, r1, PTO+PT_MODE;
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lwi r11, r1, PTO + PT_MODE;
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bnei r11, 2f;
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/* Get current task ptr into r11 */
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