sh: Exception vector rework and SH-2/SH-2A support.
This splits out common bits from the existing exception handler for use between SH-2/SH-2A and SH-3/4, and adds support for the SH-2/2A exceptions. Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Yoshinori Sato
Paul Mundt
parent
0983b31849
commit
de39840646
325
arch/sh/kernel/cpu/sh2/entry.S
Normal file
325
arch/sh/kernel/cpu/sh2/entry.S
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@ -0,0 +1,325 @@
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/*
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* arch/sh/kernel/cpu/sh2/entry.S
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*
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* The SH-2 exception entry
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*
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* Copyright (C) 2005,2006 Yoshinori Sato
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* Copyright (C) 2005 AXE,Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/cpu/mmu_context.h>
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#include <asm/unistd.h>
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#include <asm/errno.h>
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#include <asm/page.h>
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/* Offsets to the stack */
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OFF_R0 = 0 /* Return value. New ABI also arg4 */
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OFF_R1 = 4 /* New ABI: arg5 */
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OFF_R2 = 8 /* New ABI: arg6 */
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OFF_R3 = 12 /* New ABI: syscall_nr */
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OFF_R4 = 16 /* New ABI: arg0 */
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OFF_R5 = 20 /* New ABI: arg1 */
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OFF_R6 = 24 /* New ABI: arg2 */
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OFF_R7 = 28 /* New ABI: arg3 */
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OFF_SP = (15*4)
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OFF_PC = (16*4)
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OFF_SR = (16*4+2*4)
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OFF_TRA = (16*4+6*4)
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#include <asm/entry-macros.S>
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ENTRY(exception_handler)
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! already saved r0/r1
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mov.l r2,@-sp
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mov.l r3,@-sp
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mov r0,r1
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cli
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mov.l $cpu_mode,r2
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mov.l @r2,r0
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mov.l @(5*4,r15),r3 ! previous SR
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shll2 r3 ! set "S" flag
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rotl r0 ! T <- "S" flag
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rotl r0 ! "S" flag is LSB
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rotcr r3 ! T -> r3:b30
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shlr r3
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shlr r0
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bt/s 1f
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mov.l r3,@(5*4,r15) ! copy cpu mode to SR
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! switch to kernel mode
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mov #1,r0
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rotr r0
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rotr r0
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mov.l r0,@r2 ! enter kernel mode
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mov.l $current_thread_info,r2
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mov.l @r2,r2
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mov #0x20,r0
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shll8 r0
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add r2,r0
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mov r15,r2 ! r2 = user stack top
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mov r0,r15 ! switch kernel stack
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add #-4,r15 ! dummy
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mov.l r1,@-r15 ! TRA
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sts.l macl, @-r15
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sts.l mach, @-r15
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stc.l gbr, @-r15
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mov.l @(4*4,r2),r0
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mov.l @(5*4,r2),r1
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mov.l r1,@-r15 ! original SR
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sts.l pr,@-r15
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mov.l r0,@-r15 ! original PC
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mov r2,r3
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add #(4+2)*4,r3 ! rewind r0 - r3 + exception frame
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mov.l r3,@-r15 ! original SP
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mov.l r14,@-r15
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mov.l r13,@-r15
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mov.l r12,@-r15
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mov.l r11,@-r15
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mov.l r10,@-r15
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mov.l r9,@-r15
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mov.l r8,@-r15
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mov.l r7,@-r15
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mov.l r6,@-r15
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mov.l r5,@-r15
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mov.l r4,@-r15
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mov r2,r8 ! copy user -> kernel stack
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mov.l @r8+,r3
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mov.l r3,@-r15
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mov.l @r8+,r2
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mov.l r2,@-r15
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mov.l @r8+,r1
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mov.l r1,@-r15
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mov.l @r8+,r0
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bra 2f
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mov.l r0,@-r15
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1:
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! in kernel exception
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mov #(22-4-4-1)*4+4,r0
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mov r15,r2
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sub r0,r15
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mov.l @r2+,r0 ! old R3
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mov.l r0,@-r15
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mov.l @r2+,r0 ! old R2
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mov.l r0,@-r15
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mov.l @r2+,r0 ! old R1
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mov.l r0,@-r15
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mov.l @r2+,r0 ! old R0
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mov.l r0,@-r15
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mov.l @r2+,r3 ! old PC
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mov.l @r2+,r0 ! old SR
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add #-4,r2 ! exception frame stub (sr)
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mov.l r1,@-r2 ! TRA
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sts.l macl, @-r2
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sts.l mach, @-r2
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stc.l gbr, @-r2
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mov.l r0,@-r2 ! save old SR
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sts.l pr,@-r2
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mov.l r3,@-r2 ! save old PC
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mov r2,r0
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add #8*4,r0
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mov.l r0,@-r2 ! save old SP
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mov.l r14,@-r2
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mov.l r13,@-r2
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mov.l r12,@-r2
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mov.l r11,@-r2
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mov.l r10,@-r2
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mov.l r9,@-r2
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mov.l r8,@-r2
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mov.l r7,@-r2
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mov.l r6,@-r2
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mov.l r5,@-r2
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mov.l r4,@-r2
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mov.l @(OFF_R0,r15),r0
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mov.l @(OFF_R1,r15),r1
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mov.l @(OFF_R2,r15),r2
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mov.l @(OFF_R3,r15),r3
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2:
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mov #OFF_TRA,r8
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add r15,r8
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mov.l @r8,r9
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mov #64,r8
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cmp/hs r8,r9
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bt interrupt_entry ! vec >= 64 is interrupt
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mov #32,r8
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cmp/hs r8,r9
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bt trap_entry ! 64 > vec >= 32 is trap
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mov.l 4f,r8
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mov r9,r4
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shll2 r9
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add r9,r8
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mov.l @r8,r8
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mov #0,r9
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cmp/eq r9,r8
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bf 3f
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mov.l 8f,r8 ! unhandled exception
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3:
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mov.l 5f,r10
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jmp @r8
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lds r10,pr
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interrupt_entry:
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mov r9,r4
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mov.l 6f,r9
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mov.l 7f,r8
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jmp @r8
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lds r9,pr
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.align 2
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4: .long exception_handling_table
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5: .long ret_from_exception
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6: .long ret_from_irq
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7: .long do_IRQ
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8: .long do_exception_error
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trap_entry:
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add #-0x10,r9
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shll2 r9 ! TRA
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mov #OFF_TRA,r8
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add r15,r8
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mov.l r9,@r8
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mov r9,r8
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sti
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bra system_call
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nop
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.align 2
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1: .long syscall_exit
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2: .long break_point_trap_software
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3: .long NR_syscalls
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4: .long sys_call_table
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#if defined(CONFIG_SH_STANDARD_BIOS)
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/* Unwind the stack and jmp to the debug entry */
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debug_kernel_fw:
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mov r15,r0
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add #(22-4)*4-4,r0
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ldc.l @r0+,gbr
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lds.l @r0+,mach
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lds.l @r0+,macl
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mov r15,r0
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mov.l @(OFF_SP,r0),r1
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mov #OFF_SR,r2
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mov.l @(r0,r2),r3
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mov.l r3,@-r1
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mov #OFF_SP,r2
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mov.l @(r0,r2),r3
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mov.l r3,@-r1
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mov r15,r0
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add #(22-4)*4-8,r0
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mov.l 1f,r2
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mov.l @r2,r2
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stc sr,r3
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mov.l r2,@r0
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mov.l r3,@r0
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mov.l r1,@(8,r0)
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mov.l @r15+, r0
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mov.l @r15+, r1
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mov.l @r15+, r2
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mov.l @r15+, r3
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mov.l @r15+, r4
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mov.l @r15+, r5
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mov.l @r15+, r6
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mov.l @r15+, r7
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mov.l @r15+, r8
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mov.l @r15+, r9
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mov.l @r15+, r10
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mov.l @r15+, r11
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mov.l @r15+, r12
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mov.l @r15+, r13
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mov.l @r15+, r14
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add #8,r15
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lds.l @r15+, pr
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rte
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mov.l @r15+,r15
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.align 2
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1: .long gdb_vbr_vector
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#endif /* CONFIG_SH_STANDARD_BIOS */
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ENTRY(address_error_handler)
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mov r15,r4 ! regs
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add #4,r4
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mov #OFF_PC,r0
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mov.l @(r0,r15),r6 ! pc
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mov.l 1f,r0
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jmp @r0
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mov #0,r5 ! writeaccess is unknown
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.align 2
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1: .long do_address_error
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restore_all:
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cli
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mov r15,r0
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mov.l $cpu_mode,r2
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mov #OFF_SR,r3
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mov.l @(r0,r3),r1
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mov.l r1,@r2
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shll2 r1 ! clear MD bit
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shlr2 r1
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mov.l @(OFF_SP,r0),r2
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add #-8,r2
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mov.l r2,@(OFF_SP,r0) ! point exception frame top
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mov.l r1,@(4,r2) ! set sr
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mov #OFF_PC,r3
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mov.l @(r0,r3),r1
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mov.l r1,@r2 ! set pc
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add #4*16+4,r0
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lds.l @r0+,pr
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add #4,r0 ! skip sr
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ldc.l @r0+,gbr
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lds.l @r0+,mach
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lds.l @r0+,macl
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get_current_thread_info r0, r1
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mov.l $current_thread_info,r1
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mov.l r0,@r1
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mov.l @r15+,r0
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mov.l @r15+,r1
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mov.l @r15+,r2
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mov.l @r15+,r3
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mov.l @r15+,r4
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mov.l @r15+,r5
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mov.l @r15+,r6
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mov.l @r15+,r7
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mov.l @r15+,r8
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mov.l @r15+,r9
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mov.l @r15+,r10
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mov.l @r15+,r11
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mov.l @r15+,r12
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mov.l @r15+,r13
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mov.l @r15+,r14
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mov.l @r15,r15
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rte
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nop
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2:
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mov.l 1f,r8
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mov.l 2f,r9
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jmp @r9
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lds r8,pr
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.align 2
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$current_thread_info:
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.long __current_thread_info
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$cpu_mode:
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.long __cpu_mode
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! common exception handler
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#include "../../entry-common.S"
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.data
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! cpu operation mode
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! bit30 = MD (compatible SH3/4)
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__cpu_mode:
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.long 0x40000000
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.section .bss
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__current_thread_info:
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.long 0
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ENTRY(exception_handling_table)
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.space 4*32
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46
arch/sh/kernel/cpu/sh2/ex.S
Normal file
46
arch/sh/kernel/cpu/sh2/ex.S
Normal file
@ -0,0 +1,46 @@
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/*
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* arch/sh/kernel/cpu/sh2/ex.S
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*
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* The SH-2 exception vector table
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*
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* Copyright (C) 2005 Yoshinori Sato
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/linkage.h>
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!
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! convert Exception Vector to Exception Number
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!
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exception_entry:
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no = 0
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.rept 256
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mov.l r0,@-sp
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mov #no,r0
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bra exception_trampoline
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and #0xff,r0
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no = no + 1
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.endr
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exception_trampoline:
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mov.l r1,@-sp
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mov.l $exception_handler,r1
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jmp @r1
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.align 2
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$exception_entry:
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.long exception_entry
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$exception_handler:
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.long exception_handler
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!
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! Exception Vector Base
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!
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.align 2
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ENTRY(vbr_base)
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vector = 0
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.rept 256
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.long exception_entry + vector * 8
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vector = vector + 1
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.endr
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@ -2,7 +2,7 @@
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# Makefile for the Linux/SuperH SH-3 backends.
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# Makefile for the Linux/SuperH SH-3 backends.
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#
|
#
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|
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obj-y := ex.o probe.o
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obj-y := ex.o probe.o entry.o
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|
||||||
# CPU subtype setup
|
# CPU subtype setup
|
||||||
obj-$(CONFIG_CPU_SUBTYPE_SH7705) += setup-sh7705.o
|
obj-$(CONFIG_CPU_SUBTYPE_SH7705) += setup-sh7705.o
|
||||||
|
|||||||
@ -1,5 +1,5 @@
|
|||||||
/*
|
/*
|
||||||
* linux/arch/sh/entry.S
|
* arch/sh/kernel/entry.S
|
||||||
*
|
*
|
||||||
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
||||||
* Copyright (C) 2003 - 2006 Paul Mundt
|
* Copyright (C) 2003 - 2006 Paul Mundt
|
||||||
@ -7,7 +7,6 @@
|
|||||||
* This file is subject to the terms and conditions of the GNU General Public
|
* This file is subject to the terms and conditions of the GNU General Public
|
||||||
* License. See the file "COPYING" in the main directory of this archive
|
* License. See the file "COPYING" in the main directory of this archive
|
||||||
* for more details.
|
* for more details.
|
||||||
*
|
|
||||||
*/
|
*/
|
||||||
#include <linux/sys.h>
|
#include <linux/sys.h>
|
||||||
#include <linux/errno.h>
|
#include <linux/errno.h>
|
||||||
@ -81,6 +80,8 @@ OFF_TRA = (16*4+6*4)
|
|||||||
#define k_g_imask r6_bank /* r6_bank1 */
|
#define k_g_imask r6_bank /* r6_bank1 */
|
||||||
#define current r7 /* r7_bank1 */
|
#define current r7 /* r7_bank1 */
|
||||||
|
|
||||||
|
#include <asm/entry-macros.S>
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Kernel mode register usage:
|
* Kernel mode register usage:
|
||||||
* k0 scratch
|
* k0 scratch
|
||||||
@ -107,26 +108,6 @@ OFF_TRA = (16*4+6*4)
|
|||||||
! this first version depends *much* on C implementation.
|
! this first version depends *much* on C implementation.
|
||||||
!
|
!
|
||||||
|
|
||||||
#define CLI() \
|
|
||||||
stc sr, r0; \
|
|
||||||
or #0xf0, r0; \
|
|
||||||
ldc r0, sr
|
|
||||||
|
|
||||||
#define STI() \
|
|
||||||
mov.l __INV_IMASK, r11; \
|
|
||||||
stc sr, r10; \
|
|
||||||
and r11, r10; \
|
|
||||||
stc k_g_imask, r11; \
|
|
||||||
or r11, r10; \
|
|
||||||
ldc r10, sr
|
|
||||||
|
|
||||||
#if defined(CONFIG_PREEMPT)
|
|
||||||
# define preempt_stop() CLI()
|
|
||||||
#else
|
|
||||||
# define preempt_stop()
|
|
||||||
# define resume_kernel restore_all
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#if defined(CONFIG_MMU)
|
#if defined(CONFIG_MMU)
|
||||||
.align 2
|
.align 2
|
||||||
ENTRY(tlb_miss_load)
|
ENTRY(tlb_miss_load)
|
||||||
@ -168,7 +149,7 @@ call_dpf:
|
|||||||
lds r10, pr
|
lds r10, pr
|
||||||
rts
|
rts
|
||||||
nop
|
nop
|
||||||
0: STI()
|
0: sti
|
||||||
mov.l 3f, r0
|
mov.l 3f, r0
|
||||||
mov r9, r6
|
mov r9, r6
|
||||||
mov r8, r5
|
mov r8, r5
|
||||||
@ -203,32 +184,6 @@ call_dae:
|
|||||||
2: .long do_address_error
|
2: .long do_address_error
|
||||||
#endif /* CONFIG_MMU */
|
#endif /* CONFIG_MMU */
|
||||||
|
|
||||||
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
|
|
||||||
! Handle kernel debug if either kgdb (SW) or gdb-stub (FW) is present.
|
|
||||||
! If both are configured, handle the debug traps (breakpoints) in SW,
|
|
||||||
! but still allow BIOS traps to FW.
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
debug_kernel:
|
|
||||||
#if defined(CONFIG_SH_STANDARD_BIOS) && defined(CONFIG_SH_KGDB)
|
|
||||||
/* Force BIOS call to FW (debug_trap put TRA in r8) */
|
|
||||||
mov r8,r0
|
|
||||||
shlr2 r0
|
|
||||||
cmp/eq #0x3f,r0
|
|
||||||
bt debug_kernel_fw
|
|
||||||
#endif /* CONFIG_SH_STANDARD_BIOS && CONFIG_SH_KGDB */
|
|
||||||
|
|
||||||
debug_enter:
|
|
||||||
#if defined(CONFIG_SH_KGDB)
|
|
||||||
/* Jump to kgdb, pass stacked regs as arg */
|
|
||||||
debug_kernel_sw:
|
|
||||||
mov.l 3f, r0
|
|
||||||
jmp @r0
|
|
||||||
mov r15, r4
|
|
||||||
.align 2
|
|
||||||
3: .long kgdb_handle_exception
|
|
||||||
#endif /* CONFIG_SH_KGDB */
|
|
||||||
|
|
||||||
#if defined(CONFIG_SH_STANDARD_BIOS)
|
#if defined(CONFIG_SH_STANDARD_BIOS)
|
||||||
/* Unwind the stack and jmp to the debug entry */
|
/* Unwind the stack and jmp to the debug entry */
|
||||||
debug_kernel_fw:
|
debug_kernel_fw:
|
||||||
@ -269,276 +224,6 @@ debug_kernel_fw:
|
|||||||
2: .long gdb_vbr_vector
|
2: .long gdb_vbr_vector
|
||||||
#endif /* CONFIG_SH_STANDARD_BIOS */
|
#endif /* CONFIG_SH_STANDARD_BIOS */
|
||||||
|
|
||||||
#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
|
|
||||||
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
debug_trap:
|
|
||||||
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
|
|
||||||
mov #OFF_SR, r0
|
|
||||||
mov.l @(r0,r15), r0 ! get status register
|
|
||||||
shll r0
|
|
||||||
shll r0 ! kernel space?
|
|
||||||
bt/s debug_kernel
|
|
||||||
#endif
|
|
||||||
mov.l @r15, r0 ! Restore R0 value
|
|
||||||
mov.l 1f, r8
|
|
||||||
jmp @r8
|
|
||||||
nop
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
ENTRY(exception_error)
|
|
||||||
!
|
|
||||||
STI()
|
|
||||||
mov.l 2f, r0
|
|
||||||
jmp @r0
|
|
||||||
nop
|
|
||||||
|
|
||||||
!
|
|
||||||
.align 2
|
|
||||||
1: .long break_point_trap_software
|
|
||||||
2: .long do_exception_error
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
ret_from_exception:
|
|
||||||
preempt_stop()
|
|
||||||
ENTRY(ret_from_irq)
|
|
||||||
!
|
|
||||||
mov #OFF_SR, r0
|
|
||||||
mov.l @(r0,r15), r0 ! get status register
|
|
||||||
shll r0
|
|
||||||
shll r0 ! kernel space?
|
|
||||||
bt/s resume_kernel ! Yes, it's from kernel, go back soon
|
|
||||||
GET_THREAD_INFO(r8)
|
|
||||||
|
|
||||||
#ifdef CONFIG_PREEMPT
|
|
||||||
bra resume_userspace
|
|
||||||
nop
|
|
||||||
ENTRY(resume_kernel)
|
|
||||||
mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
|
|
||||||
tst r0, r0
|
|
||||||
bf noresched
|
|
||||||
need_resched:
|
|
||||||
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
|
||||||
tst #_TIF_NEED_RESCHED, r0 ! need_resched set?
|
|
||||||
bt noresched
|
|
||||||
|
|
||||||
mov #OFF_SR, r0
|
|
||||||
mov.l @(r0,r15), r0 ! get status register
|
|
||||||
and #0xf0, r0 ! interrupts off (exception path)?
|
|
||||||
cmp/eq #0xf0, r0
|
|
||||||
bt noresched
|
|
||||||
|
|
||||||
mov.l 1f, r0
|
|
||||||
mov.l r0, @(TI_PRE_COUNT,r8)
|
|
||||||
|
|
||||||
STI()
|
|
||||||
mov.l 2f, r0
|
|
||||||
jsr @r0
|
|
||||||
nop
|
|
||||||
mov #0, r0
|
|
||||||
mov.l r0, @(TI_PRE_COUNT,r8)
|
|
||||||
CLI()
|
|
||||||
|
|
||||||
bra need_resched
|
|
||||||
nop
|
|
||||||
noresched:
|
|
||||||
bra restore_all
|
|
||||||
nop
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
1: .long PREEMPT_ACTIVE
|
|
||||||
2: .long schedule
|
|
||||||
#endif
|
|
||||||
|
|
||||||
ENTRY(resume_userspace)
|
|
||||||
! r8: current_thread_info
|
|
||||||
CLI()
|
|
||||||
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
|
||||||
tst #_TIF_WORK_MASK, r0
|
|
||||||
bt/s restore_all
|
|
||||||
tst #_TIF_NEED_RESCHED, r0
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
work_pending:
|
|
||||||
! r0: current_thread_info->flags
|
|
||||||
! r8: current_thread_info
|
|
||||||
! t: result of "tst #_TIF_NEED_RESCHED, r0"
|
|
||||||
bf/s work_resched
|
|
||||||
tst #(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), r0
|
|
||||||
work_notifysig:
|
|
||||||
bt/s restore_all
|
|
||||||
mov r15, r4
|
|
||||||
mov r12, r5 ! set arg1(save_r0)
|
|
||||||
mov r0, r6
|
|
||||||
mov.l 2f, r1
|
|
||||||
mova restore_all, r0
|
|
||||||
jmp @r1
|
|
||||||
lds r0, pr
|
|
||||||
work_resched:
|
|
||||||
#ifndef CONFIG_PREEMPT
|
|
||||||
! gUSA handling
|
|
||||||
mov.l @(OFF_SP,r15), r0 ! get user space stack pointer
|
|
||||||
mov r0, r1
|
|
||||||
shll r0
|
|
||||||
bf/s 1f
|
|
||||||
shll r0
|
|
||||||
bf/s 1f
|
|
||||||
mov #OFF_PC, r0
|
|
||||||
! SP >= 0xc0000000 : gUSA mark
|
|
||||||
mov.l @(r0,r15), r2 ! get user space PC (program counter)
|
|
||||||
mov.l @(OFF_R0,r15), r3 ! end point
|
|
||||||
cmp/hs r3, r2 ! r2 >= r3?
|
|
||||||
bt 1f
|
|
||||||
add r3, r1 ! rewind point #2
|
|
||||||
mov.l r1, @(r0,r15) ! reset PC to rewind point #2
|
|
||||||
!
|
|
||||||
1:
|
|
||||||
#endif
|
|
||||||
mov.l 1f, r1
|
|
||||||
jsr @r1 ! schedule
|
|
||||||
nop
|
|
||||||
CLI()
|
|
||||||
!
|
|
||||||
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
|
||||||
tst #_TIF_WORK_MASK, r0
|
|
||||||
bt restore_all
|
|
||||||
bra work_pending
|
|
||||||
tst #_TIF_NEED_RESCHED, r0
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
1: .long schedule
|
|
||||||
2: .long do_notify_resume
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
syscall_exit_work:
|
|
||||||
! r0: current_thread_info->flags
|
|
||||||
! r8: current_thread_info
|
|
||||||
tst #_TIF_SYSCALL_TRACE, r0
|
|
||||||
bt/s work_pending
|
|
||||||
tst #_TIF_NEED_RESCHED, r0
|
|
||||||
STI()
|
|
||||||
! XXX setup arguments...
|
|
||||||
mov.l 4f, r0 ! do_syscall_trace
|
|
||||||
jsr @r0
|
|
||||||
nop
|
|
||||||
bra resume_userspace
|
|
||||||
nop
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
syscall_trace_entry:
|
|
||||||
! Yes it is traced.
|
|
||||||
! XXX setup arguments...
|
|
||||||
mov.l 4f, r11 ! Call do_syscall_trace which notifies
|
|
||||||
jsr @r11 ! superior (will chomp R[0-7])
|
|
||||||
nop
|
|
||||||
! Reload R0-R4 from kernel stack, where the
|
|
||||||
! parent may have modified them using
|
|
||||||
! ptrace(POKEUSR). (Note that R0-R2 are
|
|
||||||
! used by the system call handler directly
|
|
||||||
! from the kernel stack anyway, so don't need
|
|
||||||
! to be reloaded here.) This allows the parent
|
|
||||||
! to rewrite system calls and args on the fly.
|
|
||||||
mov.l @(OFF_R4,r15), r4 ! arg0
|
|
||||||
mov.l @(OFF_R5,r15), r5
|
|
||||||
mov.l @(OFF_R6,r15), r6
|
|
||||||
mov.l @(OFF_R7,r15), r7 ! arg3
|
|
||||||
mov.l @(OFF_R3,r15), r3 ! syscall_nr
|
|
||||||
! Arrange for do_syscall_trace to be called
|
|
||||||
! again as the system call returns.
|
|
||||||
mov.l 2f, r10 ! Number of syscalls
|
|
||||||
cmp/hs r10, r3
|
|
||||||
bf syscall_call
|
|
||||||
mov #-ENOSYS, r0
|
|
||||||
bra syscall_exit
|
|
||||||
mov.l r0, @(OFF_R0,r15) ! Return value
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Syscall interface:
|
|
||||||
*
|
|
||||||
* Syscall #: R3
|
|
||||||
* Arguments #0 to #3: R4--R7
|
|
||||||
* Arguments #4 to #6: R0, R1, R2
|
|
||||||
* TRA: (number of arguments + 0x10) x 4
|
|
||||||
*
|
|
||||||
* This code also handles delegating other traps to the BIOS/gdb stub
|
|
||||||
* according to:
|
|
||||||
*
|
|
||||||
* Trap number
|
|
||||||
* (TRA>>2) Purpose
|
|
||||||
* -------- -------
|
|
||||||
* 0x0-0xf old syscall ABI
|
|
||||||
* 0x10-0x1f new syscall ABI
|
|
||||||
* 0x20-0xff delegated through debug_trap to BIOS/gdb stub.
|
|
||||||
*
|
|
||||||
* Note: When we're first called, the TRA value must be shifted
|
|
||||||
* right 2 bits in order to get the value that was used as the "trapa"
|
|
||||||
* argument.
|
|
||||||
*/
|
|
||||||
|
|
||||||
.align 2
|
|
||||||
.globl ret_from_fork
|
|
||||||
ret_from_fork:
|
|
||||||
mov.l 1f, r8
|
|
||||||
jsr @r8
|
|
||||||
mov r0, r4
|
|
||||||
bra syscall_exit
|
|
||||||
nop
|
|
||||||
.align 2
|
|
||||||
1: .long schedule_tail
|
|
||||||
!
|
|
||||||
ENTRY(system_call)
|
|
||||||
mov.l 1f, r9
|
|
||||||
mov.l @r9, r8 ! Read from TRA (Trap Address) Register
|
|
||||||
!
|
|
||||||
! Is the trap argument >= 0x20? (TRA will be >= 0x80)
|
|
||||||
mov #0x7f, r9
|
|
||||||
cmp/hi r9, r8
|
|
||||||
bt/s 0f
|
|
||||||
mov #OFF_TRA, r9
|
|
||||||
add r15, r9
|
|
||||||
!
|
|
||||||
mov.l r8, @r9 ! set TRA value to tra
|
|
||||||
STI()
|
|
||||||
! Call the system call handler through the table.
|
|
||||||
! First check for bad syscall number
|
|
||||||
mov r3, r9
|
|
||||||
mov.l 2f, r8 ! Number of syscalls
|
|
||||||
cmp/hs r8, r9
|
|
||||||
bf/s good_system_call
|
|
||||||
GET_THREAD_INFO(r8)
|
|
||||||
syscall_badsys: ! Bad syscall number
|
|
||||||
mov #-ENOSYS, r0
|
|
||||||
bra resume_userspace
|
|
||||||
mov.l r0, @(OFF_R0,r15) ! Return value
|
|
||||||
!
|
|
||||||
0:
|
|
||||||
bra debug_trap
|
|
||||||
nop
|
|
||||||
!
|
|
||||||
good_system_call: ! Good syscall number
|
|
||||||
mov.l @(TI_FLAGS,r8), r8
|
|
||||||
mov #_TIF_SYSCALL_TRACE, r10
|
|
||||||
tst r10, r8
|
|
||||||
bf syscall_trace_entry
|
|
||||||
!
|
|
||||||
syscall_call:
|
|
||||||
shll2 r9 ! x4
|
|
||||||
mov.l 3f, r8 ! Load the address of sys_call_table
|
|
||||||
add r8, r9
|
|
||||||
mov.l @r9, r8
|
|
||||||
jsr @r8 ! jump to specific syscall handler
|
|
||||||
nop
|
|
||||||
mov.l @(OFF_R0,r15), r12 ! save r0
|
|
||||||
mov.l r0, @(OFF_R0,r15) ! save the return value
|
|
||||||
!
|
|
||||||
syscall_exit:
|
|
||||||
CLI()
|
|
||||||
!
|
|
||||||
GET_THREAD_INFO(r8)
|
|
||||||
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
|
||||||
tst #_TIF_ALLWORK_MASK, r0
|
|
||||||
bf syscall_exit_work
|
|
||||||
restore_all:
|
restore_all:
|
||||||
mov.l @r15+, r0
|
mov.l @r15+, r0
|
||||||
mov.l @r15+, r1
|
mov.l @r15+, r1
|
||||||
@ -606,7 +291,9 @@ skip_restore:
|
|||||||
!
|
!
|
||||||
! Calculate new SR value
|
! Calculate new SR value
|
||||||
mov k3, k2 ! original SR value
|
mov k3, k2 ! original SR value
|
||||||
mov.l 9f, k1
|
mov #0xf0, k1
|
||||||
|
extu.b k1, k1
|
||||||
|
not k1, k1
|
||||||
and k1, k2 ! Mask orignal SR value
|
and k1, k2 ! Mask orignal SR value
|
||||||
!
|
!
|
||||||
mov k3, k0 ! Calculate IMASK-bits
|
mov k3, k0 ! Calculate IMASK-bits
|
||||||
@ -632,16 +319,12 @@ skip_restore:
|
|||||||
nop
|
nop
|
||||||
|
|
||||||
.align 2
|
.align 2
|
||||||
1: .long TRA
|
|
||||||
2: .long NR_syscalls
|
|
||||||
3: .long sys_call_table
|
|
||||||
4: .long do_syscall_trace
|
|
||||||
5: .long 0x00001000 ! DSP
|
5: .long 0x00001000 ! DSP
|
||||||
7: .long 0x30000000
|
7: .long 0x30000000
|
||||||
9:
|
|
||||||
__INV_IMASK:
|
|
||||||
.long 0xffffff0f ! ~(IMASK)
|
|
||||||
|
|
||||||
|
! common exception handler
|
||||||
|
#include "../../entry.S"
|
||||||
|
|
||||||
! Exception Vector Base
|
! Exception Vector Base
|
||||||
!
|
!
|
||||||
! Should be aligned page boundary.
|
! Should be aligned page boundary.
|
||||||
@ -761,7 +444,7 @@ skip_save:
|
|||||||
! Save the user registers on the stack.
|
! Save the user registers on the stack.
|
||||||
mov.l k2, @-r15 ! EXPEVT
|
mov.l k2, @-r15 ! EXPEVT
|
||||||
|
|
||||||
mov #-1, k4
|
mov #-1, k4
|
||||||
mov.l k4, @-r15 ! set TRA (default: -1)
|
mov.l k4, @-r15 ! set TRA (default: -1)
|
||||||
!
|
!
|
||||||
sts.l macl, @-r15
|
sts.l macl, @-r15
|
||||||
@ -2,7 +2,8 @@
|
|||||||
# Makefile for the Linux/SuperH SH-4 backends.
|
# Makefile for the Linux/SuperH SH-4 backends.
|
||||||
#
|
#
|
||||||
|
|
||||||
obj-y := ex.o probe.o
|
obj-y := ex.o probe.o common.o
|
||||||
|
common-y += $(addprefix ../sh3/, entry.o)
|
||||||
|
|
||||||
obj-$(CONFIG_SH_FPU) += fpu.o
|
obj-$(CONFIG_SH_FPU) += fpu.o
|
||||||
obj-$(CONFIG_SH_STORE_QUEUES) += sq.o
|
obj-$(CONFIG_SH_STORE_QUEUES) += sq.o
|
||||||
|
|||||||
372
arch/sh/kernel/entry-common.S
Normal file
372
arch/sh/kernel/entry-common.S
Normal file
@ -0,0 +1,372 @@
|
|||||||
|
/* $Id: entry.S,v 1.37 2004/06/11 13:02:46 doyu Exp $
|
||||||
|
*
|
||||||
|
* linux/arch/sh/entry.S
|
||||||
|
*
|
||||||
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
||||||
|
* Copyright (C) 2003 Paul Mundt
|
||||||
|
*
|
||||||
|
* This file is subject to the terms and conditions of the GNU General Public
|
||||||
|
* License. See the file "COPYING" in the main directory of this archive
|
||||||
|
* for more details.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
! NOTE:
|
||||||
|
! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
|
||||||
|
! to be jumped is too far, but it causes illegal slot exception.
|
||||||
|
|
||||||
|
/*
|
||||||
|
* entry.S contains the system-call and fault low-level handling routines.
|
||||||
|
* This also contains the timer-interrupt handler, as well as all interrupts
|
||||||
|
* and faults that can result in a task-switch.
|
||||||
|
*
|
||||||
|
* NOTE: This code handles signal-recognition, which happens every time
|
||||||
|
* after a timer-interrupt and after each system call.
|
||||||
|
*
|
||||||
|
* NOTE: This code uses a convention that instructions in the delay slot
|
||||||
|
* of a transfer-control instruction are indented by an extra space, thus:
|
||||||
|
*
|
||||||
|
* jmp @k0 ! control-transfer instruction
|
||||||
|
* ldc k1, ssr ! delay slot
|
||||||
|
*
|
||||||
|
* Stack layout in 'ret_from_syscall':
|
||||||
|
* ptrace needs to have all regs on the stack.
|
||||||
|
* if the order here is changed, it needs to be
|
||||||
|
* updated in ptrace.c and ptrace.h
|
||||||
|
*
|
||||||
|
* r0
|
||||||
|
* ...
|
||||||
|
* r15 = stack pointer
|
||||||
|
* spc
|
||||||
|
* pr
|
||||||
|
* ssr
|
||||||
|
* gbr
|
||||||
|
* mach
|
||||||
|
* macl
|
||||||
|
* syscall #
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#if defined(CONFIG_PREEMPT)
|
||||||
|
# define preempt_stop() cli
|
||||||
|
#else
|
||||||
|
# define preempt_stop()
|
||||||
|
# define resume_kernel __restore_all
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
|
||||||
|
! Handle kernel debug if either kgdb (SW) or gdb-stub (FW) is present.
|
||||||
|
! If both are configured, handle the debug traps (breakpoints) in SW,
|
||||||
|
! but still allow BIOS traps to FW.
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
debug_kernel:
|
||||||
|
#if defined(CONFIG_SH_STANDARD_BIOS) && defined(CONFIG_SH_KGDB)
|
||||||
|
/* Force BIOS call to FW (debug_trap put TRA in r8) */
|
||||||
|
mov r8,r0
|
||||||
|
shlr2 r0
|
||||||
|
cmp/eq #0x3f,r0
|
||||||
|
bt debug_kernel_fw
|
||||||
|
#endif /* CONFIG_SH_STANDARD_BIOS && CONFIG_SH_KGDB */
|
||||||
|
|
||||||
|
debug_enter:
|
||||||
|
#if defined(CONFIG_SH_KGDB)
|
||||||
|
/* Jump to kgdb, pass stacked regs as arg */
|
||||||
|
debug_kernel_sw:
|
||||||
|
mov.l 3f, r0
|
||||||
|
jmp @r0
|
||||||
|
mov r15, r4
|
||||||
|
.align 2
|
||||||
|
3: .long kgdb_handle_exception
|
||||||
|
#endif /* CONFIG_SH_KGDB */
|
||||||
|
|
||||||
|
#endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
|
||||||
|
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
debug_trap:
|
||||||
|
#if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
|
||||||
|
mov #OFF_SR, r0
|
||||||
|
mov.l @(r0,r15), r0 ! get status register
|
||||||
|
shll r0
|
||||||
|
shll r0 ! kernel space?
|
||||||
|
bt/s debug_kernel
|
||||||
|
#endif
|
||||||
|
mov.l @r15, r0 ! Restore R0 value
|
||||||
|
mov.l 1f, r8
|
||||||
|
jmp @r8
|
||||||
|
nop
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
ENTRY(exception_error)
|
||||||
|
!
|
||||||
|
sti
|
||||||
|
mov.l 2f, r0
|
||||||
|
jmp @r0
|
||||||
|
nop
|
||||||
|
|
||||||
|
!
|
||||||
|
.align 2
|
||||||
|
1: .long break_point_trap_software
|
||||||
|
2: .long do_exception_error
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
ret_from_exception:
|
||||||
|
preempt_stop()
|
||||||
|
ENTRY(ret_from_irq)
|
||||||
|
!
|
||||||
|
mov #OFF_SR, r0
|
||||||
|
mov.l @(r0,r15), r0 ! get status register
|
||||||
|
shll r0
|
||||||
|
shll r0 ! kernel space?
|
||||||
|
get_current_thread_info r8, r0
|
||||||
|
bt resume_kernel ! Yes, it's from kernel, go back soon
|
||||||
|
|
||||||
|
#ifdef CONFIG_PREEMPT
|
||||||
|
bra resume_userspace
|
||||||
|
nop
|
||||||
|
ENTRY(resume_kernel)
|
||||||
|
mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
|
||||||
|
tst r0, r0
|
||||||
|
bf noresched
|
||||||
|
need_resched:
|
||||||
|
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
||||||
|
tst #_TIF_NEED_RESCHED, r0 ! need_resched set?
|
||||||
|
bt noresched
|
||||||
|
|
||||||
|
mov #OFF_SR, r0
|
||||||
|
mov.l @(r0,r15), r0 ! get status register
|
||||||
|
and #0xf0, r0 ! interrupts off (exception path)?
|
||||||
|
cmp/eq #0xf0, r0
|
||||||
|
bt noresched
|
||||||
|
|
||||||
|
mov.l 1f, r0
|
||||||
|
mov.l r0, @(TI_PRE_COUNT,r8)
|
||||||
|
|
||||||
|
sti
|
||||||
|
mov.l 2f, r0
|
||||||
|
jsr @r0
|
||||||
|
nop
|
||||||
|
mov #0, r0
|
||||||
|
mov.l r0, @(TI_PRE_COUNT,r8)
|
||||||
|
cli
|
||||||
|
|
||||||
|
bra need_resched
|
||||||
|
nop
|
||||||
|
noresched:
|
||||||
|
bra __restore_all
|
||||||
|
nop
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
1: .long PREEMPT_ACTIVE
|
||||||
|
2: .long schedule
|
||||||
|
#endif
|
||||||
|
|
||||||
|
ENTRY(resume_userspace)
|
||||||
|
! r8: current_thread_info
|
||||||
|
cli
|
||||||
|
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
||||||
|
tst #_TIF_WORK_MASK, r0
|
||||||
|
bt/s __restore_all
|
||||||
|
tst #_TIF_NEED_RESCHED, r0
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
work_pending:
|
||||||
|
! r0: current_thread_info->flags
|
||||||
|
! r8: current_thread_info
|
||||||
|
! t: result of "tst #_TIF_NEED_RESCHED, r0"
|
||||||
|
bf/s work_resched
|
||||||
|
tst #(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), r0
|
||||||
|
work_notifysig:
|
||||||
|
bt/s __restore_all
|
||||||
|
mov r15, r4
|
||||||
|
mov r12, r5 ! set arg1(save_r0)
|
||||||
|
mov r0, r6
|
||||||
|
mov.l 2f, r1
|
||||||
|
mov.l 3f, r0
|
||||||
|
jmp @r1
|
||||||
|
lds r0, pr
|
||||||
|
work_resched:
|
||||||
|
#ifndef CONFIG_PREEMPT
|
||||||
|
! gUSA handling
|
||||||
|
mov.l @(OFF_SP,r15), r0 ! get user space stack pointer
|
||||||
|
mov r0, r1
|
||||||
|
shll r0
|
||||||
|
bf/s 1f
|
||||||
|
shll r0
|
||||||
|
bf/s 1f
|
||||||
|
mov #OFF_PC, r0
|
||||||
|
! SP >= 0xc0000000 : gUSA mark
|
||||||
|
mov.l @(r0,r15), r2 ! get user space PC (program counter)
|
||||||
|
mov.l @(OFF_R0,r15), r3 ! end point
|
||||||
|
cmp/hs r3, r2 ! r2 >= r3?
|
||||||
|
bt 1f
|
||||||
|
add r3, r1 ! rewind point #2
|
||||||
|
mov.l r1, @(r0,r15) ! reset PC to rewind point #2
|
||||||
|
!
|
||||||
|
1:
|
||||||
|
#endif
|
||||||
|
mov.l 1f, r1
|
||||||
|
jsr @r1 ! schedule
|
||||||
|
nop
|
||||||
|
cli
|
||||||
|
!
|
||||||
|
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
||||||
|
tst #_TIF_WORK_MASK, r0
|
||||||
|
bt __restore_all
|
||||||
|
bra work_pending
|
||||||
|
tst #_TIF_NEED_RESCHED, r0
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
1: .long schedule
|
||||||
|
2: .long do_notify_resume
|
||||||
|
3: .long restore_all
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
syscall_exit_work:
|
||||||
|
! r0: current_thread_info->flags
|
||||||
|
! r8: current_thread_info
|
||||||
|
tst #_TIF_SYSCALL_TRACE, r0
|
||||||
|
bt/s work_pending
|
||||||
|
tst #_TIF_NEED_RESCHED, r0
|
||||||
|
sti
|
||||||
|
! XXX setup arguments...
|
||||||
|
mov.l 4f, r0 ! do_syscall_trace
|
||||||
|
jsr @r0
|
||||||
|
nop
|
||||||
|
bra resume_userspace
|
||||||
|
nop
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
syscall_trace_entry:
|
||||||
|
! Yes it is traced.
|
||||||
|
! XXX setup arguments...
|
||||||
|
mov.l 4f, r11 ! Call do_syscall_trace which notifies
|
||||||
|
jsr @r11 ! superior (will chomp R[0-7])
|
||||||
|
nop
|
||||||
|
! Reload R0-R4 from kernel stack, where the
|
||||||
|
! parent may have modified them using
|
||||||
|
! ptrace(POKEUSR). (Note that R0-R2 are
|
||||||
|
! used by the system call handler directly
|
||||||
|
! from the kernel stack anyway, so don't need
|
||||||
|
! to be reloaded here.) This allows the parent
|
||||||
|
! to rewrite system calls and args on the fly.
|
||||||
|
mov.l @(OFF_R4,r15), r4 ! arg0
|
||||||
|
mov.l @(OFF_R5,r15), r5
|
||||||
|
mov.l @(OFF_R6,r15), r6
|
||||||
|
mov.l @(OFF_R7,r15), r7 ! arg3
|
||||||
|
mov.l @(OFF_R3,r15), r3 ! syscall_nr
|
||||||
|
! Arrange for do_syscall_trace to be called
|
||||||
|
! again as the system call returns.
|
||||||
|
mov.l 2f, r10 ! Number of syscalls
|
||||||
|
cmp/hs r10, r3
|
||||||
|
bf syscall_call
|
||||||
|
mov #-ENOSYS, r0
|
||||||
|
bra syscall_exit
|
||||||
|
mov.l r0, @(OFF_R0,r15) ! Return value
|
||||||
|
|
||||||
|
__restore_all:
|
||||||
|
mov.l 1f,r0
|
||||||
|
jmp @r0
|
||||||
|
nop
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
1: .long restore_all
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Syscall interface:
|
||||||
|
*
|
||||||
|
* Syscall #: R3
|
||||||
|
* Arguments #0 to #3: R4--R7
|
||||||
|
* Arguments #4 to #6: R0, R1, R2
|
||||||
|
* TRA: (number of arguments + 0x10) x 4
|
||||||
|
*
|
||||||
|
* This code also handles delegating other traps to the BIOS/gdb stub
|
||||||
|
* according to:
|
||||||
|
*
|
||||||
|
* Trap number
|
||||||
|
* (TRA>>2) Purpose
|
||||||
|
* -------- -------
|
||||||
|
* 0x0-0xf old syscall ABI
|
||||||
|
* 0x10-0x1f new syscall ABI
|
||||||
|
* 0x20-0xff delegated through debug_trap to BIOS/gdb stub.
|
||||||
|
*
|
||||||
|
* Note: When we're first called, the TRA value must be shifted
|
||||||
|
* right 2 bits in order to get the value that was used as the "trapa"
|
||||||
|
* argument.
|
||||||
|
*/
|
||||||
|
|
||||||
|
.align 2
|
||||||
|
.globl ret_from_fork
|
||||||
|
ret_from_fork:
|
||||||
|
mov.l 1f, r8
|
||||||
|
jsr @r8
|
||||||
|
mov r0, r4
|
||||||
|
bra syscall_exit
|
||||||
|
nop
|
||||||
|
.align 2
|
||||||
|
1: .long schedule_tail
|
||||||
|
!
|
||||||
|
ENTRY(system_call)
|
||||||
|
#if !defined(CONFIG_CPU_SH2)
|
||||||
|
mov.l 1f, r9
|
||||||
|
mov.l @r9, r8 ! Read from TRA (Trap Address) Register
|
||||||
|
#endif
|
||||||
|
!
|
||||||
|
! Is the trap argument >= 0x20? (TRA will be >= 0x80)
|
||||||
|
mov #0x7f, r9
|
||||||
|
cmp/hi r9, r8
|
||||||
|
bt/s 0f
|
||||||
|
mov #OFF_TRA, r9
|
||||||
|
add r15, r9
|
||||||
|
!
|
||||||
|
mov.l r8, @r9 ! set TRA value to tra
|
||||||
|
sti
|
||||||
|
! Call the system call handler through the table.
|
||||||
|
! First check for bad syscall number
|
||||||
|
mov r3, r9
|
||||||
|
mov.l 2f, r8 ! Number of syscalls
|
||||||
|
cmp/hs r8, r9
|
||||||
|
get_current_thread_info r8, r10
|
||||||
|
bf good_system_call
|
||||||
|
syscall_badsys: ! Bad syscall number
|
||||||
|
mov #-ENOSYS, r0
|
||||||
|
bra resume_userspace
|
||||||
|
mov.l r0, @(OFF_R0,r15) ! Return value
|
||||||
|
!
|
||||||
|
0:
|
||||||
|
bra debug_trap
|
||||||
|
nop
|
||||||
|
!
|
||||||
|
good_system_call: ! Good syscall number
|
||||||
|
mov.l @(TI_FLAGS,r8), r8
|
||||||
|
mov #_TIF_SYSCALL_TRACE, r10
|
||||||
|
tst r10, r8
|
||||||
|
bf syscall_trace_entry
|
||||||
|
!
|
||||||
|
syscall_call:
|
||||||
|
shll2 r9 ! x4
|
||||||
|
mov.l 3f, r8 ! Load the address of sys_call_table
|
||||||
|
add r8, r9
|
||||||
|
mov.l @r9, r8
|
||||||
|
jsr @r8 ! jump to specific syscall handler
|
||||||
|
nop
|
||||||
|
mov.l @(OFF_R0,r15), r12 ! save r0
|
||||||
|
mov.l r0, @(OFF_R0,r15) ! save the return value
|
||||||
|
!
|
||||||
|
syscall_exit:
|
||||||
|
cli
|
||||||
|
!
|
||||||
|
get_current_thread_info r8, r0
|
||||||
|
mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
|
||||||
|
tst #_TIF_ALLWORK_MASK, r0
|
||||||
|
bf syscall_exit_work
|
||||||
|
bra __restore_all
|
||||||
|
nop
|
||||||
|
.align 2
|
||||||
|
#if !defined(CONFIG_CPU_SH2)
|
||||||
|
1: .long TRA
|
||||||
|
#endif
|
||||||
|
2: .long NR_syscalls
|
||||||
|
3: .long sys_call_table
|
||||||
|
4: .long do_syscall_trace
|
||||||
@ -53,8 +53,10 @@ ENTRY(_stext)
|
|||||||
ldc r0, sr
|
ldc r0, sr
|
||||||
! Initialize global interrupt mask
|
! Initialize global interrupt mask
|
||||||
mov #0, r0
|
mov #0, r0
|
||||||
|
#ifdef CONFIG_CPU_HAS_SR_RB
|
||||||
ldc r0, r6_bank
|
ldc r0, r6_bank
|
||||||
|
#endif
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Prefetch if possible to reduce cache miss penalty.
|
* Prefetch if possible to reduce cache miss penalty.
|
||||||
*
|
*
|
||||||
@ -71,8 +73,10 @@ ENTRY(_stext)
|
|||||||
mov #(THREAD_SIZE >> 8), r1
|
mov #(THREAD_SIZE >> 8), r1
|
||||||
shll8 r1 ! r1 = THREAD_SIZE
|
shll8 r1 ! r1 = THREAD_SIZE
|
||||||
sub r1, r0 !
|
sub r1, r0 !
|
||||||
|
#ifdef CONFIG_CPU_HAS_SR_RB
|
||||||
ldc r0, r7_bank ! ... and initial thread_info
|
ldc r0, r7_bank ! ... and initial thread_info
|
||||||
|
#endif
|
||||||
|
|
||||||
! Clear BSS area
|
! Clear BSS area
|
||||||
mov.l 3f, r1
|
mov.l 3f, r1
|
||||||
add #4, r1
|
add #4, r1
|
||||||
@ -95,7 +99,11 @@ ENTRY(_stext)
|
|||||||
nop
|
nop
|
||||||
|
|
||||||
.balign 4
|
.balign 4
|
||||||
|
#if defined(CONFIG_CPU_SH2)
|
||||||
|
1: .long 0x000000F0 ! IMASK=0xF
|
||||||
|
#else
|
||||||
1: .long 0x400080F0 ! MD=1, RB=0, BL=0, FD=1, IMASK=0xF
|
1: .long 0x400080F0 ! MD=1, RB=0, BL=0, FD=1, IMASK=0xF
|
||||||
|
#endif
|
||||||
2: .long init_thread_union+THREAD_SIZE
|
2: .long init_thread_union+THREAD_SIZE
|
||||||
3: .long __bss_start
|
3: .long __bss_start
|
||||||
4: .long _end
|
4: .long _end
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user