Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/sh/kernel/entry.S b/arch/sh/kernel/entry.S
new file mode 100644
index 0000000..6615e48
--- /dev/null
+++ b/arch/sh/kernel/entry.S
@@ -0,0 +1,1149 @@
+/* $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.
+ *
+ */
+
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <linux/config.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+
+#if !defined(CONFIG_NFSD) && !defined(CONFIG_NFSD_MODULE)
+#define sys_nfsservctl sys_ni_syscall
+#endif
+
+#if !defined(CONFIG_MMU)
+#define sys_madvise sys_ni_syscall
+#define sys_readahead sys_ni_syscall
+#define sys_mprotect sys_ni_syscall
+#define sys_msync sys_ni_syscall
+#define sys_mlock sys_ni_syscall
+#define sys_munlock sys_ni_syscall
+#define sys_mlockall sys_ni_syscall
+#define sys_munlockall sys_ni_syscall
+#define sys_mremap sys_ni_syscall
+#define sys_mincore sys_ni_syscall
+#define sys_remap_file_pages sys_ni_syscall
+#endif
+
+! 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 #
+ *
+ */
+
+ENOSYS = 38
+EINVAL = 22
+
+#if defined(CONFIG_CPU_SH3)
+TRA = 0xffffffd0
+EXPEVT = 0xffffffd4
+#if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709) || \
+ defined(CONFIG_CPU_SUBTYPE_SH7300) || defined(CONFIG_CPU_SUBTYPE_SH7705)
+INTEVT = 0xa4000000 ! INTEVTE2(0xa4000000)
+#else
+INTEVT = 0xffffffd8
+#endif
+MMU_TEA = 0xfffffffc ! TLB Exception Address Register
+#elif defined(CONFIG_CPU_SH4)
+TRA = 0xff000020
+EXPEVT = 0xff000024
+INTEVT = 0xff000028
+MMU_TEA = 0xff00000c ! TLB Exception Address Register
+#endif
+
+#if defined(CONFIG_KGDB_NMI)
+NMI_VEC = 0x1c0 ! Must catch early for debounce
+#endif
+
+/* Offsets to the stack */
+OFF_R0 = 0 /* Return value. New ABI also arg4 */
+OFF_R1 = 4 /* New ABI: arg5 */
+OFF_R2 = 8 /* New ABI: arg6 */
+OFF_R3 = 12 /* New ABI: syscall_nr */
+OFF_R4 = 16 /* New ABI: arg0 */
+OFF_R5 = 20 /* New ABI: arg1 */
+OFF_R6 = 24 /* New ABI: arg2 */
+OFF_R7 = 28 /* New ABI: arg3 */
+OFF_SP = (15*4)
+OFF_PC = (16*4)
+OFF_SR = (16*4+8)
+OFF_TRA = (16*4+6*4)
+
+
+#define k0 r0
+#define k1 r1
+#define k2 r2
+#define k3 r3
+#define k4 r4
+
+#define k_ex_code r2_bank /* r2_bank1 */
+#define g_imask r6 /* r6_bank1 */
+#define k_g_imask r6_bank /* r6_bank1 */
+#define current r7 /* r7_bank1 */
+
+/*
+ * Kernel mode register usage:
+ * k0 scratch
+ * k1 scratch
+ * k2 scratch (Exception code)
+ * k3 scratch (Return address)
+ * k4 scratch
+ * k5 reserved
+ * k6 Global Interrupt Mask (0--15 << 4)
+ * k7 CURRENT_THREAD_INFO (pointer to current thread info)
+ */
+
+!
+! TLB Miss / Initial Page write exception handling
+! _and_
+! TLB hits, but the access violate the protection.
+! It can be valid access, such as stack grow and/or C-O-W.
+!
+!
+! Find the pmd/pte entry and loadtlb
+! If it's not found, cause address error (SEGV)
+!
+! Although this could be written in assembly language (and it'd be faster),
+! 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)
+ .align 2
+ENTRY(tlb_miss_load)
+ bra call_dpf
+ mov #0, r5
+
+ .align 2
+ENTRY(tlb_miss_store)
+ bra call_dpf
+ mov #1, r5
+
+ .align 2
+ENTRY(initial_page_write)
+ bra call_dpf
+ mov #1, r5
+
+ .align 2
+ENTRY(tlb_protection_violation_load)
+ bra call_dpf
+ mov #0, r5
+
+ .align 2
+ENTRY(tlb_protection_violation_store)
+ bra call_dpf
+ mov #1, r5
+
+call_dpf:
+ mov.l 1f, r0
+ mov r5, r8
+ mov.l @r0, r6
+ mov r6, r9
+ mov.l 2f, r0
+ sts pr, r10
+ jsr @r0
+ mov r15, r4
+ !
+ tst r0, r0
+ bf/s 0f
+ lds r10, pr
+ rts
+ nop
+0: STI()
+ mov.l 3f, r0
+ mov r9, r6
+ mov r8, r5
+ jmp @r0
+ mov r15, r4
+
+ .align 2
+1: .long MMU_TEA
+2: .long __do_page_fault
+3: .long do_page_fault
+
+ .align 2
+ENTRY(address_error_load)
+ bra call_dae
+ mov #0,r5 ! writeaccess = 0
+
+ .align 2
+ENTRY(address_error_store)
+ bra call_dae
+ mov #1,r5 ! writeaccess = 1
+
+ .align 2
+call_dae:
+ mov.l 1f, r0
+ mov.l @r0, r6 ! address
+ mov.l 2f, r0
+ jmp @r0
+ mov r15, r4 ! regs
+
+ .align 2
+1: .long MMU_TEA
+2: .long do_address_error
+#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)
+ /* Unwind the stack and jmp to the debug entry */
+debug_kernel_fw:
+ mov.l @r15+, r0
+ mov.l @r15+, r1
+ mov.l @r15+, r2
+ mov.l @r15+, r3
+ mov.l @r15+, r4
+ mov.l @r15+, r5
+ mov.l @r15+, r6
+ mov.l @r15+, r7
+ stc sr, r8
+ mov.l 1f, r9 ! BL =1, RB=1, IMASK=0x0F
+ or r9, r8
+ ldc r8, sr ! here, change the register bank
+ mov.l @r15+, r8
+ mov.l @r15+, r9
+ mov.l @r15+, r10
+ mov.l @r15+, r11
+ mov.l @r15+, r12
+ mov.l @r15+, r13
+ mov.l @r15+, r14
+ mov.l @r15+, k0
+ ldc.l @r15+, spc
+ lds.l @r15+, pr
+ mov.l @r15+, k1
+ ldc.l @r15+, gbr
+ lds.l @r15+, mach
+ lds.l @r15+, macl
+ mov k0, r15
+ !
+ mov.l 2f, k0
+ mov.l @k0, k0
+ jmp @k0
+ ldc k1, ssr
+ .align 2
+1: .long 0x300000f0
+2: .long gdb_vbr_vector
+#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()
+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, r0
+work_notifysig:
+ bt/s restore_all
+ mov r15, r4
+ mov #0, r5
+ 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_signal
+
+ .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 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:
+ mov.l @r15+, r0
+ mov.l @r15+, r1
+ mov.l @r15+, r2
+ mov.l @r15+, r3
+ mov.l @r15+, r4
+ mov.l @r15+, r5
+ mov.l @r15+, r6
+ mov.l @r15+, r7
+ !
+ stc sr, r8
+ mov.l 7f, r9
+ or r9, r8 ! BL =1, RB=1
+ ldc r8, sr ! here, change the register bank
+ !
+ mov.l @r15+, r8
+ mov.l @r15+, r9
+ mov.l @r15+, r10
+ mov.l @r15+, r11
+ mov.l @r15+, r12
+ mov.l @r15+, r13
+ mov.l @r15+, r14
+ mov.l @r15+, k4 ! original stack pointer
+ ldc.l @r15+, spc
+ lds.l @r15+, pr
+ mov.l @r15+, k3 ! original SR
+ ldc.l @r15+, gbr
+ lds.l @r15+, mach
+ lds.l @r15+, macl
+ add #4, r15 ! Skip syscall number
+ !
+#ifdef CONFIG_SH_DSP
+ mov.l @r15+, k0 ! DSP mode marker
+ mov.l 5f, k1
+ cmp/eq k0, k1 ! Do we have a DSP stack frame?
+ bf skip_restore
+
+ stc sr, k0 ! Enable CPU DSP mode
+ or k1, k0 ! (within kernel it may be disabled)
+ ldc k0, sr
+ mov r2, k0 ! Backup r2
+
+ ! Restore DSP registers from stack
+ mov r15, r2
+ movs.l @r2+, a1
+ movs.l @r2+, a0g
+ movs.l @r2+, a1g
+ movs.l @r2+, m0
+ movs.l @r2+, m1
+ mov r2, r15
+
+ lds.l @r15+, a0
+ lds.l @r15+, x0
+ lds.l @r15+, x1
+ lds.l @r15+, y0
+ lds.l @r15+, y1
+ lds.l @r15+, dsr
+ ldc.l @r15+, rs
+ ldc.l @r15+, re
+ ldc.l @r15+, mod
+
+ mov k0, r2 ! Restore r2
+skip_restore:
+#endif
+ !
+ ! Calculate new SR value
+ mov k3, k2 ! original SR value
+ mov.l 9f, k1
+ and k1, k2 ! Mask orignal SR value
+ !
+ mov k3, k0 ! Calculate IMASK-bits
+ shlr2 k0
+ and #0x3c, k0
+ cmp/eq #0x3c, k0
+ bt/s 6f
+ shll2 k0
+ mov g_imask, k0
+ !
+6: or k0, k2 ! Set the IMASK-bits
+ ldc k2, ssr
+ !
+#if defined(CONFIG_KGDB_NMI)
+ ! Clear in_nmi
+ mov.l 4f, k0
+ mov #0, k1
+ mov.b k1, @k0
+#endif
+ mov.l @r15+, k2 ! restore EXPEVT
+ mov k4, r15
+ rte
+ nop
+
+ .align 2
+1: .long TRA
+2: .long NR_syscalls
+3: .long sys_call_table
+4: .long do_syscall_trace
+5: .long 0x00001000 ! DSP
+7: .long 0x30000000
+9:
+__INV_IMASK:
+ .long 0xffffff0f ! ~(IMASK)
+
+! Exception Vector Base
+!
+! Should be aligned page boundary.
+!
+ .balign 4096,0,4096
+ENTRY(vbr_base)
+ .long 0
+!
+ .balign 256,0,256
+general_exception:
+ mov.l 1f, k2
+ mov.l 2f, k3
+ bra handle_exception
+ mov.l @k2, k2
+ .align 2
+1: .long EXPEVT
+2: .long ret_from_exception
+!
+!
+ .balign 1024,0,1024
+tlb_miss:
+ mov.l 1f, k2
+ mov.l 4f, k3
+ bra handle_exception
+ mov.l @k2, k2
+!
+ .balign 512,0,512
+interrupt:
+ mov.l 2f, k2
+ mov.l 3f, k3
+#if defined(CONFIG_KGDB_NMI)
+ ! Debounce (filter nested NMI)
+ mov.l @k2, k0
+ mov.l 5f, k1
+ cmp/eq k1, k0
+ bf 0f
+ mov.l 6f, k1
+ tas.b @k1
+ bt 0f
+ rte
+ nop
+ .align 2
+5: .long NMI_VEC
+6: .long in_nmi
+0:
+#endif /* defined(CONFIG_KGDB_NMI) */
+ bra handle_exception
+ mov.l @k2, k2
+
+ .align 2
+1: .long EXPEVT
+2: .long INTEVT
+3: .long ret_from_irq
+4: .long ret_from_exception
+
+!
+!
+ .align 2
+handle_exception:
+ ! Using k0, k1 for scratch registers (r0_bank1, r1_bank),
+ ! save all registers onto stack.
+ !
+ stc ssr, k0 ! Is it from kernel space?
+ shll k0 ! Check MD bit (bit30) by shifting it into...
+ shll k0 ! ...the T bit
+ bt/s 1f ! It's a kernel to kernel transition.
+ mov r15, k0 ! save original stack to k0
+ /* User space to kernel */
+ mov #0x20, k1
+ shll8 k1 ! k1 := 8192 (== THREAD_SIZE)
+ add current, k1
+ mov k1, r15 ! change to kernel stack
+ !
+1: mov #-1, k4
+ mov.l 2f, k1
+ !
+#ifdef CONFIG_SH_DSP
+ mov.l r2, @-r15 ! Save r2, we need another reg
+ stc sr, k4
+ mov.l 1f, r2
+ tst r2, k4 ! Check if in DSP mode
+ mov.l @r15+, r2 ! Restore r2 now
+ bt/s skip_save
+ mov #0, k4 ! Set marker for no stack frame
+
+ mov r2, k4 ! Backup r2 (in k4) for later
+
+ ! Save DSP registers on stack
+ stc.l mod, @-r15
+ stc.l re, @-r15
+ stc.l rs, @-r15
+ sts.l dsr, @-r15
+ sts.l y1, @-r15
+ sts.l y0, @-r15
+ sts.l x1, @-r15
+ sts.l x0, @-r15
+ sts.l a0, @-r15
+
+ ! GAS is broken, does not generate correct "movs.l Ds,@-As" instr.
+
+ ! FIXME: Make sure that this is still the case with newer toolchains,
+ ! as we're not at all interested in supporting ancient toolchains at
+ ! this point. -- PFM.
+
+ mov r15, r2
+ .word 0xf653 ! movs.l a1, @-r2
+ .word 0xf6f3 ! movs.l a0g, @-r2
+ .word 0xf6d3 ! movs.l a1g, @-r2
+ .word 0xf6c3 ! movs.l m0, @-r2
+ .word 0xf6e3 ! movs.l m1, @-r2
+ mov r2, r15
+
+ mov k4, r2 ! Restore r2
+ mov.l 1f, k4 ! Force DSP stack frame
+skip_save:
+ mov.l k4, @-r15 ! Push DSP mode marker onto stack
+#endif
+ ! Save the user registers on the stack.
+ mov.l k2, @-r15 ! EXPEVT
+ mov.l k4, @-r15 ! set TRA (default: -1)
+ !
+ sts.l macl, @-r15
+ sts.l mach, @-r15
+ stc.l gbr, @-r15
+ stc.l ssr, @-r15
+ sts.l pr, @-r15
+ stc.l spc, @-r15
+ !
+ lds k3, pr ! Set the return address to pr
+ !
+ mov.l k0, @-r15 ! save orignal stack
+ mov.l r14, @-r15
+ mov.l r13, @-r15
+ mov.l r12, @-r15
+ mov.l r11, @-r15
+ mov.l r10, @-r15
+ mov.l r9, @-r15
+ mov.l r8, @-r15
+ !
+ stc sr, r8 ! Back to normal register bank, and
+ or k1, r8 ! Block all interrupts
+ mov.l 3f, k1
+ and k1, r8 ! ...
+ ldc r8, sr ! ...changed here.
+ !
+ mov.l r7, @-r15
+ mov.l r6, @-r15
+ mov.l r5, @-r15
+ mov.l r4, @-r15
+ mov.l r3, @-r15
+ mov.l r2, @-r15
+ mov.l r1, @-r15
+ mov.l r0, @-r15
+ ! Then, dispatch to the handler, according to the exception code.
+ stc k_ex_code, r8
+ shlr2 r8
+ shlr r8
+ mov.l 4f, r9
+ add r8, r9
+ mov.l @r9, r9
+ jmp @r9
+ nop
+
+ .align 2
+1: .long 0x00001000 ! DSP=1
+2: .long 0x000080f0 ! FD=1, IMASK=15
+3: .long 0xcfffffff ! RB=0, BL=0
+4: .long exception_handling_table
+
+ .align 2
+ENTRY(exception_none)
+ rts
+ nop
+
+ .data
+ENTRY(sys_call_table)
+ .long sys_ni_syscall /* 0 - old "setup()" system call*/
+ .long sys_exit
+ .long sys_fork
+ .long sys_read
+ .long sys_write
+ .long sys_open /* 5 */
+ .long sys_close
+ .long sys_waitpid
+ .long sys_creat
+ .long sys_link
+ .long sys_unlink /* 10 */
+ .long sys_execve
+ .long sys_chdir
+ .long sys_time
+ .long sys_mknod
+ .long sys_chmod /* 15 */
+ .long sys_lchown16
+ .long sys_ni_syscall /* old break syscall holder */
+ .long sys_stat
+ .long sys_lseek
+ .long sys_getpid /* 20 */
+ .long sys_mount
+ .long sys_oldumount
+ .long sys_setuid16
+ .long sys_getuid16
+ .long sys_stime /* 25 */
+ .long sys_ptrace
+ .long sys_alarm
+ .long sys_fstat
+ .long sys_pause
+ .long sys_utime /* 30 */
+ .long sys_ni_syscall /* old stty syscall holder */
+ .long sys_ni_syscall /* old gtty syscall holder */
+ .long sys_access
+ .long sys_nice
+ .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
+ .long sys_sync
+ .long sys_kill
+ .long sys_rename
+ .long sys_mkdir
+ .long sys_rmdir /* 40 */
+ .long sys_dup
+ .long sys_pipe
+ .long sys_times
+ .long sys_ni_syscall /* old prof syscall holder */
+ .long sys_brk /* 45 */
+ .long sys_setgid16
+ .long sys_getgid16
+ .long sys_signal
+ .long sys_geteuid16
+ .long sys_getegid16 /* 50 */
+ .long sys_acct
+ .long sys_umount /* recycled never used phys() */
+ .long sys_ni_syscall /* old lock syscall holder */
+ .long sys_ioctl
+ .long sys_fcntl /* 55 */
+ .long sys_ni_syscall /* old mpx syscall holder */
+ .long sys_setpgid
+ .long sys_ni_syscall /* old ulimit syscall holder */
+ .long sys_ni_syscall /* sys_olduname */
+ .long sys_umask /* 60 */
+ .long sys_chroot
+ .long sys_ustat
+ .long sys_dup2
+ .long sys_getppid
+ .long sys_getpgrp /* 65 */
+ .long sys_setsid
+ .long sys_sigaction
+ .long sys_sgetmask
+ .long sys_ssetmask
+ .long sys_setreuid16 /* 70 */
+ .long sys_setregid16
+ .long sys_sigsuspend
+ .long sys_sigpending
+ .long sys_sethostname
+ .long sys_setrlimit /* 75 */
+ .long sys_old_getrlimit
+ .long sys_getrusage
+ .long sys_gettimeofday
+ .long sys_settimeofday
+ .long sys_getgroups16 /* 80 */
+ .long sys_setgroups16
+ .long sys_ni_syscall /* sys_oldselect */
+ .long sys_symlink
+ .long sys_lstat
+ .long sys_readlink /* 85 */
+ .long sys_uselib
+ .long sys_swapon
+ .long sys_reboot
+ .long old_readdir
+ .long old_mmap /* 90 */
+ .long sys_munmap
+ .long sys_truncate
+ .long sys_ftruncate
+ .long sys_fchmod
+ .long sys_fchown16 /* 95 */
+ .long sys_getpriority
+ .long sys_setpriority
+ .long sys_ni_syscall /* old profil syscall holder */
+ .long sys_statfs
+ .long sys_fstatfs /* 100 */
+ .long sys_ni_syscall /* ioperm */
+ .long sys_socketcall
+ .long sys_syslog
+ .long sys_setitimer
+ .long sys_getitimer /* 105 */
+ .long sys_newstat
+ .long sys_newlstat
+ .long sys_newfstat
+ .long sys_uname
+ .long sys_ni_syscall /* 110 */ /* iopl */
+ .long sys_vhangup
+ .long sys_ni_syscall /* idle */
+ .long sys_ni_syscall /* vm86old */
+ .long sys_wait4
+ .long sys_swapoff /* 115 */
+ .long sys_sysinfo
+ .long sys_ipc
+ .long sys_fsync
+ .long sys_sigreturn
+ .long sys_clone /* 120 */
+ .long sys_setdomainname
+ .long sys_newuname
+ .long sys_ni_syscall /* sys_modify_ldt */
+ .long sys_adjtimex
+ .long sys_mprotect /* 125 */
+ .long sys_sigprocmask
+ .long sys_ni_syscall /* old "create_module" */
+ .long sys_init_module
+ .long sys_delete_module
+ .long sys_ni_syscall /* 130: old "get_kernel_syms" */
+ .long sys_quotactl
+ .long sys_getpgid
+ .long sys_fchdir
+ .long sys_bdflush
+ .long sys_sysfs /* 135 */
+ .long sys_personality
+ .long sys_ni_syscall /* for afs_syscall */
+ .long sys_setfsuid16
+ .long sys_setfsgid16
+ .long sys_llseek /* 140 */
+ .long sys_getdents
+ .long sys_select
+ .long sys_flock
+ .long sys_msync
+ .long sys_readv /* 145 */
+ .long sys_writev
+ .long sys_getsid
+ .long sys_fdatasync
+ .long sys_sysctl
+ .long sys_mlock /* 150 */
+ .long sys_munlock
+ .long sys_mlockall
+ .long sys_munlockall
+ .long sys_sched_setparam
+ .long sys_sched_getparam /* 155 */
+ .long sys_sched_setscheduler
+ .long sys_sched_getscheduler
+ .long sys_sched_yield
+ .long sys_sched_get_priority_max
+ .long sys_sched_get_priority_min /* 160 */
+ .long sys_sched_rr_get_interval
+ .long sys_nanosleep
+ .long sys_mremap
+ .long sys_setresuid16
+ .long sys_getresuid16 /* 165 */
+ .long sys_ni_syscall /* vm86 */
+ .long sys_ni_syscall /* old "query_module" */
+ .long sys_poll
+ .long sys_nfsservctl
+ .long sys_setresgid16 /* 170 */
+ .long sys_getresgid16
+ .long sys_prctl
+ .long sys_rt_sigreturn
+ .long sys_rt_sigaction
+ .long sys_rt_sigprocmask /* 175 */
+ .long sys_rt_sigpending
+ .long sys_rt_sigtimedwait
+ .long sys_rt_sigqueueinfo
+ .long sys_rt_sigsuspend
+ .long sys_pread_wrapper /* 180 */
+ .long sys_pwrite_wrapper
+ .long sys_chown16
+ .long sys_getcwd
+ .long sys_capget
+ .long sys_capset /* 185 */
+ .long sys_sigaltstack
+ .long sys_sendfile
+ .long sys_ni_syscall /* streams1 */
+ .long sys_ni_syscall /* streams2 */
+ .long sys_vfork /* 190 */
+ .long sys_getrlimit
+ .long sys_mmap2
+ .long sys_truncate64
+ .long sys_ftruncate64
+ .long sys_stat64 /* 195 */
+ .long sys_lstat64
+ .long sys_fstat64
+ .long sys_lchown
+ .long sys_getuid
+ .long sys_getgid /* 200 */
+ .long sys_geteuid
+ .long sys_getegid
+ .long sys_setreuid
+ .long sys_setregid
+ .long sys_getgroups /* 205 */
+ .long sys_setgroups
+ .long sys_fchown
+ .long sys_setresuid
+ .long sys_getresuid
+ .long sys_setresgid /* 210 */
+ .long sys_getresgid
+ .long sys_chown
+ .long sys_setuid
+ .long sys_setgid
+ .long sys_setfsuid /* 215 */
+ .long sys_setfsgid
+ .long sys_pivot_root
+ .long sys_mincore
+ .long sys_madvise
+ .long sys_getdents64 /* 220 */
+ .long sys_fcntl64
+ .long sys_ni_syscall /* reserved for TUX */
+ .long sys_ni_syscall /* Reserved for Security */
+ .long sys_gettid
+ .long sys_readahead /* 225 */
+ .long sys_setxattr
+ .long sys_lsetxattr
+ .long sys_fsetxattr
+ .long sys_getxattr
+ .long sys_lgetxattr /* 230 */
+ .long sys_fgetxattr
+ .long sys_listxattr
+ .long sys_llistxattr
+ .long sys_flistxattr
+ .long sys_removexattr /* 235 */
+ .long sys_lremovexattr
+ .long sys_fremovexattr
+ .long sys_tkill
+ .long sys_sendfile64
+ .long sys_futex /* 240 */
+ .long sys_sched_setaffinity
+ .long sys_sched_getaffinity
+ .long sys_ni_syscall
+ .long sys_ni_syscall
+ .long sys_io_setup /* 245 */
+ .long sys_io_destroy
+ .long sys_io_getevents
+ .long sys_io_submit
+ .long sys_io_cancel
+ .long sys_fadvise64 /* 250 */
+ .long sys_ni_syscall
+ .long sys_exit_group
+ .long sys_lookup_dcookie
+ .long sys_epoll_create
+ .long sys_epoll_ctl /* 255 */
+ .long sys_epoll_wait
+ .long sys_remap_file_pages
+ .long sys_set_tid_address
+ .long sys_timer_create
+ .long sys_timer_settime /* 260 */
+ .long sys_timer_gettime
+ .long sys_timer_getoverrun
+ .long sys_timer_delete
+ .long sys_clock_settime
+ .long sys_clock_gettime /* 265 */
+ .long sys_clock_getres
+ .long sys_clock_nanosleep
+ .long sys_statfs64
+ .long sys_fstatfs64
+ .long sys_tgkill /* 270 */
+ .long sys_utimes
+ .long sys_fadvise64_64_wrapper
+ .long sys_ni_syscall /* Reserved for vserver */
+ .long sys_ni_syscall /* Reserved for mbind */
+ .long sys_ni_syscall /* 275 - get_mempolicy */
+ .long sys_ni_syscall /* set_mempolicy */
+ .long sys_mq_open
+ .long sys_mq_unlink
+ .long sys_mq_timedsend
+ .long sys_mq_timedreceive /* 280 */
+ .long sys_mq_notify
+ .long sys_mq_getsetattr
+ .long sys_ni_syscall /* Reserved for kexec */
+ .long sys_waitid
+ .long sys_add_key /* 285 */
+ .long sys_request_key
+ .long sys_keyctl
+
+/* End of entry.S */