From 36f6095419b100479bd3ffabcafe4dac8d918734 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Tue, 22 Jun 2010 13:27:43 +0200 Subject: [PATCH] microblaze: Save and restore r3/r4 in SAVE/RESTORE_REGS macros Save and restore R3/R4 registers in macros. This change help to cleanup entry.S. In ret_from_trap function we are saving returning value from syscall to pt_regs on stack that's why we don't need to save and restore these values before kernel functions (schedule, do_signal). Signed-off-by: Michal Simek --- arch/microblaze/kernel/entry.S | 48 ++++++---------------------------- 1 file changed, 8 insertions(+), 40 deletions(-) diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index d40a59f9db4b..8f90ce7ecb6c 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -194,6 +194,8 @@ #define SAVE_REGS \ swi r2, r1, PTO+PT_R2; /* Save SDA */ \ + swi r3, r1, PTO+PT_R3; \ + swi r4, r1, PTO+PT_R4; \ swi r5, r1, PTO+PT_R5; \ swi r6, r1, PTO+PT_R6; \ swi r7, r1, PTO+PT_R7; \ @@ -228,6 +230,8 @@ mts rmsr , r11; \ nop; \ lwi r2, r1, PTO+PT_R2; /* restore SDA */ \ + lwi r3, r1, PTO+PT_R3; \ + lwi r4, r1, PTO+PT_R4; \ lwi r5, r1, PTO+PT_R5; \ lwi r6, r1, PTO+PT_R6; \ lwi r7, r1, PTO+PT_R7; \ @@ -379,13 +383,12 @@ C_ENTRY(_user_exception): /* We re-enable BIP bit before state restore */ C_ENTRY(ret_from_trap): set_bip; /* Ints masked for state restore*/ - lwi r11, r1, PTO+PT_MODE; -/* See if returning to kernel mode, if so, skip resched &c. */ - bnei r11, 2f; - 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. */ @@ -422,9 +425,6 @@ C_ENTRY(ret_from_trap): /* Finally, return to user state. */ 1: - lwi r3, r1, PTO + PT_R3; /* restore syscall result */ - lwi r4, r1, PTO + PT_R4; - swi r0, r0, PER_CPU(KM); /* Now officially in user state. */ swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */ VM_OFF; @@ -522,10 +522,6 @@ C_ENTRY(sys_rt_sigreturn_wrapper): swi r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */ \ lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */\ addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\ - /* store return registers separately because \ - * this macros is use for others exceptions */ \ - swi r3, r1, PTO + PT_R3; \ - swi r4, r1, PTO + PT_R4; \ SAVE_REGS \ /* PC, before IRQ/trap - this is one instruction above */ \ swi r17, r1, PTO+PT_PC; \ @@ -543,10 +539,6 @@ C_ENTRY(sys_rt_sigreturn_wrapper): tophys(r1,r1); \ \ addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\ - /* store return registers separately because this macros \ - * is use for others exceptions */ \ - swi r3, r1, PTO + PT_R3; \ - swi r4, r1, PTO + PT_R4; \ SAVE_REGS \ /* PC, before IRQ/trap - this is one instruction above FIXME*/ \ swi r17, r1, PTO+PT_PC; \ @@ -689,9 +681,7 @@ 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. - * store return registers separately because this macros is use - * for others exceptions */ + * (in a possibly modified form) after do_signal returns. */ la r5, r1, PTO; /* Arg 1: struct pt_regs *regs */ addi r7, r0, 0; /* Arg 3: int in_syscall */ bralid r15, do_signal; /* Handle any signals */ @@ -703,8 +693,6 @@ C_ENTRY(ret_from_exc): VM_OFF; tophys(r1,r1); - lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ - lwi r4, r1, PTO+PT_R4; RESTORE_REGS; addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ @@ -713,8 +701,6 @@ C_ENTRY(ret_from_exc): /* Return to kernel state. */ 2: VM_OFF; tophys(r1,r1); - lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ - lwi r4, r1, PTO+PT_R4; RESTORE_REGS; addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ @@ -753,10 +739,6 @@ C_ENTRY(_interrupt): /* save registers */ /* MS: Make room on the stack -> activation record */ addik r1, r1, -STATE_SAVE_SIZE; -/* MS: store return registers separately because - * this macros is use for others exceptions */ - swi r3, r1, PTO + PT_R3; - swi r4, r1, PTO + PT_R4; SAVE_REGS /* MS: store mode */ addi r11, r0, 1; /* MS: Was in kernel-mode. */ @@ -776,8 +758,6 @@ C_ENTRY(_interrupt): tophys(r1,r1); /* save registers */ addik r1, r1, -STATE_SAVE_SIZE; - swi r3, r1, PTO+PT_R3; - swi r4, r1, PTO+PT_R4; SAVE_REGS /* calculate mode */ swi r0, r1, PTO + PT_MODE; @@ -829,8 +809,6 @@ no_intr_resched: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); VM_OFF; tophys(r1,r1); - lwi r3, r1, PTO + PT_R3; /* MS: restore saved r3, r4 registers */ - lwi r4, r1, PTO + PT_R4; RESTORE_REGS addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ lwi r1, r1, PT_R1 - PT_SIZE; @@ -859,8 +837,6 @@ restore: #endif VM_OFF /* MS: turn off MMU */ tophys(r1,r1) - lwi r3, r1, PTO + PT_R3; /* MS: restore saved r3, r4 registers */ - lwi r4, r1, PTO + PT_R4; RESTORE_REGS addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */ tovirt(r1,r1); @@ -893,8 +869,6 @@ C_ENTRY(_debug_exception): lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */ addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ - swi r3, r1, PTO + PT_R3; - swi r4, r1, PTO + PT_R4; SAVE_REGS; addi r11, r0, 1; /* Was in kernel-mode. */ @@ -910,8 +884,6 @@ C_ENTRY(_debug_exception): tophys(r1,r1); addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */ - swi r3, r1, PTO + PT_R3; - swi r4, r1, PTO + PT_R4; SAVE_REGS; swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ @@ -979,8 +951,6 @@ dbtrap_call: rtbd r11, 0; VM_OFF; tophys(r1,r1); - lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ - lwi r4, r1, PTO+PT_R4; RESTORE_REGS addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ @@ -992,8 +962,6 @@ dbtrap_call: rtbd r11, 0; /* Return to kernel state. */ 2: VM_OFF; tophys(r1,r1); - lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */ - lwi r4, r1, PTO+PT_R4; RESTORE_REGS addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */ -- 2.39.5