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Diffstat (limited to 'arch/blackfin/mach-common/entry.S')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 1207 |
1 files changed, 1207 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S new file mode 100644 index 0000000..8eb0a90 --- /dev/null +++ b/arch/blackfin/mach-common/entry.S @@ -0,0 +1,1207 @@ +/* + * File: arch/blackfin/mach-common/entry.S + * Based on: + * Author: Linus Torvalds + * + * Created: ? + * Description: 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. + * + * Modified: + * Copyright 2004-2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * 25-Dec-2004 - LG Soft India + * 1. Fix in return_from_int, to make sure any pending + * system call in ILAT for this process to get + * executed, otherwise in case context switch happens, + * system call of first process (i.e in ILAT) will be + * carried forward to the switched process. + * 2. Removed Constant references for the following + * a. IPEND + * b. EXCAUSE mask + * c. PAGE Mask + */ + +/* + * NOTE: This code handles signal-recognition, which happens every time + * after a timer-interrupt and after each system call. + */ + + +#include <linux/linkage.h> +#include <asm/blackfin.h> +#include <asm/unistd.h> +#include <asm/errno.h> +#include <asm/thread_info.h> /* TIF_NEED_RESCHED */ +#include <asm/asm-offsets.h> + +#include <asm/mach-common/context.S> + +#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE + /* + * TODO: this should be proper save/restore, but for now + * we'll just cheat and use 0x1/0x13 + */ +# define DEBUG_START_HWTRACE \ + P5.l = LO(TBUFCTL); \ + P5.h = HI(TBUFCTL); \ + R7 = 0x13; \ + [P5] = R7; +# define DEBUG_STOP_HWTRACE \ + P5.l = LO(TBUFCTL); \ + P5.h = HI(TBUFCTL); \ + R7 = 0x01; \ + [P5] = R7; +#else +# define DEBUG_START_HWTRACE +# define DEBUG_STOP_HWTRACE +#endif + +#ifdef CONFIG_EXCPT_IRQ_SYSC_L1 +.section .l1.text +#else +.text +#endif + +/* Slightly simplified and streamlined entry point for CPLB misses. + * This one does not lower the level to IRQ5, and thus can be used to + * patch up CPLB misses on the kernel stack. + */ +ENTRY(_ex_dcplb) +#if defined(ANOMALY_05000261) + /* + * Work around an anomaly: if we see a new DCPLB fault, return + * without doing anything. Then, if we get the same fault again, + * handle it. + */ + p5.l = _last_cplb_fault_retx; + p5.h = _last_cplb_fault_retx; + r7 = [p5]; + r6 = retx; + [p5] = r6; + cc = r6 == r7; + if !cc jump _return_from_exception; + /* fall through */ +#endif + +ENTRY(_ex_icplb) + (R7:6,P5:4) = [sp++]; + ASTAT = [sp++]; + SAVE_ALL_SYS + call __cplb_hdr; + DEBUG_START_HWTRACE + RESTORE_ALL_SYS + SP = RETN; + rtx; + +ENTRY(_ex_spinlock) + /* Transform this into a syscall - twiddle the syscall vector. */ + p5.l = lo(EVT15); + p5.h = hi(EVT15); + r7.l = _spinlock_bh; + r7.h = _spinlock_bh; + [p5] = r7; + csync; + /* Fall through. */ + +ENTRY(_ex_syscall) + DEBUG_START_HWTRACE + (R7:6,P5:4) = [sp++]; + ASTAT = [sp++]; + raise 15; /* invoked by TRAP #0, for sys call */ + sp = retn; + rtx + +ENTRY(_spinlock_bh) + SAVE_ALL_SYS + /* To end up here, vector 15 was changed - so we have to change it + * back. + */ + p0.l = lo(EVT15); + p0.h = hi(EVT15); + p1.l = _evt_system_call; + p1.h = _evt_system_call; + [p0] = p1; + csync; + r0 = [sp + PT_R0]; + sp += -12; + call _sys_bfin_spinlock; + sp += 12; + [SP + PT_R0] = R0; + RESTORE_ALL_SYS + rti; + +ENTRY(_ex_soft_bp) + r7 = retx; + r7 += -2; + retx = r7; + jump.s _ex_trap_c; + +ENTRY(_ex_single_step) + r7 = retx; + r6 = reti; + cc = r7 == r6; + if cc jump _return_from_exception + r7 = syscfg; + bitclr (r7, 0); + syscfg = R7; + + p5.l = lo(IPEND); + p5.h = hi(IPEND); + r6 = [p5]; + cc = bittst(r6, 5); + if !cc jump _ex_trap_c; + p4.l = lo(EVT5); + p4.h = hi(EVT5); + r6.h = _exception_to_level5; + r6.l = _exception_to_level5; + r7 = [p4]; + cc = r6 == r7; + if !cc jump _ex_trap_c; + +_return_from_exception: + DEBUG_START_HWTRACE + (R7:6,P5:4) = [sp++]; + ASTAT = [sp++]; + sp = retn; + rtx; + +ENTRY(_handle_bad_cplb) + /* To get here, we just tried and failed to change a CPLB + * so, handle things in trap_c (C code), by lowering to + * IRQ5, just like we normally do. Since this is not a + * "normal" return path, we have a do alot of stuff to + * the stack to get ready so, we can fall through - we + * need to make a CPLB exception look like a normal exception + */ + + DEBUG_START_HWTRACE + RESTORE_ALL_SYS + [--sp] = ASTAT; + [--sp] = (R7:6, P5:4); + +ENTRY(_ex_trap_c) + /* Call C code (trap_c) to handle the exception, which most + * likely involves sending a signal to the current process. + * To avoid double faults, lower our priority to IRQ5 first. + */ + P5.h = _exception_to_level5; + P5.l = _exception_to_level5; + p4.l = lo(EVT5); + p4.h = hi(EVT5); + [p4] = p5; + csync; + + /* Disable all interrupts, but make sure level 5 is enabled so + * we can switch to that level. Save the old mask. */ + cli r6; + p4.l = _excpt_saved_imask; + p4.h = _excpt_saved_imask; + [p4] = r6; + r6 = 0x3f; + sti r6; + + /* Save the excause into a circular buffer, in case the instruction + * which caused this excecptions causes others. + */ + P5.l = _in_ptr_excause; + P5.h = _in_ptr_excause; + R7 = [P5]; + R7 += 4; + R6 = 0xF; + R7 = R7 & R6; + [P5] = R7; + R6.l = _excause_circ_buf; + R6.h = _excause_circ_buf; + R7 = R7 + R6; + p5 = R7; + R6 = SEQSTAT; + [P5] = R6; + + DEBUG_START_HWTRACE + (R7:6,P5:4) = [sp++]; + ASTAT = [sp++]; + SP = RETN; + raise 5; + rtx; + +ENTRY(_exception_to_level5) + SAVE_ALL_SYS + + /* Restore interrupt mask. We haven't pushed RETI, so this + * doesn't enable interrupts until we return from this handler. */ + p4.l = _excpt_saved_imask; + p4.h = _excpt_saved_imask; + r6 = [p4]; + sti r6; + + /* Restore the hardware error vector. */ + P5.h = _evt_ivhw; + P5.l = _evt_ivhw; + p4.l = lo(EVT5); + p4.h = hi(EVT5); + [p4] = p5; + csync; + + p2.l = lo(IPEND); + p2.h = hi(IPEND); + csync; + r0 = [p2]; /* Read current IPEND */ + [sp + PT_IPEND] = r0; /* Store IPEND */ + + /* Pop the excause from the circular buffer and push it on the stack + * (in the right place - if you change the location of SEQSTAT, you + * must change this offset. + */ +.L_excep_to_5_again: + P5.l = _out_ptr_excause; + P5.h = _out_ptr_excause; + R7 = [P5]; + R7 += 4; + R6 = 0xF; + R7 = R7 & R6; + [P5] = R7; + R6.l = _excause_circ_buf; + R6.h = _excause_circ_buf; + R7 = R7 + R6; + P5 = R7; + R1 = [P5]; + [SP + 8] = r1; + + r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */ + SP += -12; + call _trap_c; + SP += 12; + + /* See if anything else is in the exception buffer + * if there is, process it + */ + P5.l = _out_ptr_excause; + P5.h = _out_ptr_excause; + P4.l = _in_ptr_excause; + P4.h = _in_ptr_excause; + R6 = [P5]; + R7 = [P4]; + CC = R6 == R7; + if ! CC JUMP .L_excep_to_5_again + + call _ret_from_exception; + RESTORE_ALL_SYS + rti; + +ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/ + /* Since the kernel stack can be anywhere, it's not guaranteed to be + * covered by a CPLB. Switch to an exception stack; use RETN as a + * scratch register (for want of a better option). + */ + retn = sp; + sp.l = _exception_stack_top; + sp.h = _exception_stack_top; + /* Try to deal with syscalls quickly. */ + [--sp] = ASTAT; + [--sp] = (R7:6, P5:4); + DEBUG_STOP_HWTRACE + r7 = SEQSTAT; /* reason code is in bit 5:0 */ + r6.l = lo(SEQSTAT_EXCAUSE); + r6.h = hi(SEQSTAT_EXCAUSE); + r7 = r7 & r6; + p5.h = _extable; + p5.l = _extable; + p4 = r7; + p5 = p5 + (p4 << 2); + p4 = [p5]; + jump (p4); + +.Lbadsys: + r7 = -ENOSYS; /* signextending enough */ + [sp + PT_R0] = r7; /* return value from system call */ + jump .Lsyscall_really_exit; + +ENTRY(_kernel_execve) + link SIZEOF_PTREGS; + p0 = sp; + r3 = SIZEOF_PTREGS / 4; + r4 = 0(x); +0: + [p0++] = r4; + r3 += -1; + cc = r3 == 0; + if !cc jump 0b (bp); + + p0 = sp; + sp += -16; + [sp + 12] = p0; + call _do_execve; + SP += 16; + cc = r0 == 0; + if ! cc jump 1f; + /* Success. Copy our temporary pt_regs to the top of the kernel + * stack and do a normal exception return. + */ + r1 = sp; + r0 = (-KERNEL_STACK_SIZE) (x); + r1 = r1 & r0; + p2 = r1; + p3 = [p2]; + r0 = KERNEL_STACK_SIZE - 4 (z); + p1 = r0; + p1 = p1 + p2; + + p0 = fp; + r4 = [p0--]; + r3 = SIZEOF_PTREGS / 4; +0: + r4 = [p0--]; + [p1--] = r4; + r3 += -1; + cc = r3 == 0; + if ! cc jump 0b (bp); + + r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z); + p1 = r0; + p1 = p1 + p2; + sp = p1; + r0 = syscfg; + [SP + PT_SYSCFG] = r0; + [p3 + (TASK_THREAD + THREAD_KSP)] = sp; + + RESTORE_CONTEXT; + rti; +1: + unlink; + rts; + +ENTRY(_system_call) + /* Store IPEND */ + p2.l = lo(IPEND); + p2.h = hi(IPEND); + csync; + r0 = [p2]; + [sp + PT_IPEND] = r0; + + /* Store RETS for now */ + r0 = rets; + [sp + PT_RESERVED] = r0; + /* Set the stack for the current process */ + r7 = sp; + r6.l = lo(ALIGN_PAGE_MASK); + r6.h = hi(ALIGN_PAGE_MASK); + r7 = r7 & r6; /* thread_info */ + p2 = r7; + p2 = [p2]; + + [p2+(TASK_THREAD+THREAD_KSP)] = sp; + + /* Check the System Call */ + r7 = __NR_syscall; + /* System call number is passed in P0 */ + r6 = p0; + cc = r6 < r7; + if ! cc jump .Lbadsys; + + /* are we tracing syscalls?*/ + r7 = sp; + r6.l = lo(ALIGN_PAGE_MASK); + r6.h = hi(ALIGN_PAGE_MASK); + r7 = r7 & r6; + p2 = r7; + r7 = [p2+TI_FLAGS]; + CC = BITTST(r7,TIF_SYSCALL_TRACE); + if CC JUMP _sys_trace; + + /* Execute the appropriate system call */ + + p4 = p0; + p5.l = _sys_call_table; + p5.h = _sys_call_table; + p5 = p5 + (p4 << 2); + r0 = [sp + PT_R0]; + r1 = [sp + PT_R1]; + r2 = [sp + PT_R2]; + p5 = [p5]; + + [--sp] = r5; + [--sp] = r4; + [--sp] = r3; + SP += -12; + call (p5); + SP += 24; + [sp + PT_R0] = r0; + +.Lresume_userspace: + r7 = sp; + r4.l = lo(ALIGN_PAGE_MASK); + r4.h = hi(ALIGN_PAGE_MASK); + r7 = r7 & r4; /* thread_info->flags */ + p5 = r7; +.Lresume_userspace_1: + /* Disable interrupts. */ + [--sp] = reti; + reti = [sp++]; + + r7 = [p5 + TI_FLAGS]; + r4.l = lo(_TIF_WORK_MASK); + r4.h = hi(_TIF_WORK_MASK); + r7 = r7 & r4; + +.Lsyscall_resched: + cc = BITTST(r7, TIF_NEED_RESCHED); + if !cc jump .Lsyscall_sigpending; + + /* Reenable interrupts. */ + [--sp] = reti; + r0 = [sp++]; + + SP += -12; + call _schedule; + SP += 12; + + jump .Lresume_userspace_1; + +.Lsyscall_sigpending: + cc = BITTST(r7, TIF_RESTORE_SIGMASK); + if cc jump .Lsyscall_do_signals; + cc = BITTST(r7, TIF_SIGPENDING); + if !cc jump .Lsyscall_really_exit; +.Lsyscall_do_signals: + /* Reenable interrupts. */ + [--sp] = reti; + r0 = [sp++]; + + r0 = sp; + SP += -12; + call _do_signal; + SP += 12; + +.Lsyscall_really_exit: + r5 = [sp + PT_RESERVED]; + rets = r5; + rts; + +_sys_trace: + call _syscall_trace; + + /* Execute the appropriate system call */ + + p4 = [SP + PT_P0]; + p5.l = _sys_call_table; + p5.h = _sys_call_table; + p5 = p5 + (p4 << 2); + r0 = [sp + PT_R0]; + r1 = [sp + PT_R1]; + r2 = [sp + PT_R2]; + r3 = [sp + PT_R3]; + r4 = [sp + PT_R4]; + r5 = [sp + PT_R5]; + p5 = [p5]; + + [--sp] = r5; + [--sp] = r4; + [--sp] = r3; + SP += -12; + call (p5); + SP += 24; + [sp + PT_R0] = r0; + + call _syscall_trace; + jump .Lresume_userspace; + +ENTRY(_resume) + /* + * Beware - when entering resume, prev (the current task) is + * in r0, next (the new task) is in r1. + */ + p0 = r0; + p1 = r1; + [--sp] = rets; + [--sp] = fp; + [--sp] = (r7:4, p5:3); + + /* save usp */ + p2 = usp; + [p0+(TASK_THREAD+THREAD_USP)] = p2; + + /* save current kernel stack pointer */ + [p0+(TASK_THREAD+THREAD_KSP)] = sp; + + /* save program counter */ + r1.l = _new_old_task; + r1.h = _new_old_task; + [p0+(TASK_THREAD+THREAD_PC)] = r1; + + /* restore the kernel stack pointer */ + sp = [p1+(TASK_THREAD+THREAD_KSP)]; + + /* restore user stack pointer */ + p0 = [p1+(TASK_THREAD+THREAD_USP)]; + usp = p0; + + /* restore pc */ + p0 = [p1+(TASK_THREAD+THREAD_PC)]; + jump (p0); + + /* + * Following code actually lands up in a new (old) task. + */ + +_new_old_task: + (r7:4, p5:3) = [sp++]; + fp = [sp++]; + rets = [sp++]; + + /* + * When we come out of resume, r0 carries "old" task, becuase we are + * in "new" task. + */ + rts; + +ENTRY(_ret_from_exception) + p2.l = lo(IPEND); + p2.h = hi(IPEND); + + csync; + r0 = [p2]; + [sp + PT_IPEND] = r0; + +1: + r1 = 0x37(Z); + r2 = ~r1; + r2.h = 0; + r0 = r2 & r0; + cc = r0 == 0; + if !cc jump 4f; /* if not return to user mode, get out */ + + /* Make sure any pending system call or deferred exception + * return in ILAT for this process to get executed, otherwise + * in case context switch happens, system call of + * first process (i.e in ILAT) will be carried + * forward to the switched process + */ + + p2.l = lo(ILAT); + p2.h = hi(ILAT); + r0 = [p2]; + r1 = (EVT_IVG14 | EVT_IVG15) (z); + r0 = r0 & r1; + cc = r0 == 0; + if !cc jump 5f; + + /* Set the stack for the current process */ + r7 = sp; + r4.l = lo(ALIGN_PAGE_MASK); + r4.h = hi(ALIGN_PAGE_MASK); + r7 = r7 & r4; /* thread_info->flags */ + p5 = r7; + r7 = [p5 + TI_FLAGS]; + r4.l = lo(_TIF_WORK_MASK); + r4.h = hi(_TIF_WORK_MASK); + r7 = r7 & r4; + cc = r7 == 0; + if cc jump 4f; + + p0.l = lo(EVT15); + p0.h = hi(EVT15); + p1.l = _schedule_and_signal; + p1.h = _schedule_and_signal; + [p0] = p1; + csync; + raise 15; /* raise evt14 to do signal or reschedule */ +4: + r0 = syscfg; + bitclr(r0, 0); + syscfg = r0; +5: + rts; + +ENTRY(_return_from_int) + /* If someone else already raised IRQ 15, do nothing. */ + csync; + p2.l = lo(ILAT); + p2.h = hi(ILAT); + r0 = [p2]; + cc = bittst (r0, EVT_IVG15_P); + if cc jump 2f; + + /* if not return to user mode, get out */ + p2.l = lo(IPEND); + p2.h = hi(IPEND); + r0 = [p2]; + r1 = 0x17(Z); + r2 = ~r1; + r2.h = 0; + r0 = r2 & r0; + r1 = 1; + r1 = r0 - r1; + r2 = r0 & r1; + cc = r2 == 0; + if !cc jump 2f; + + /* Lower the interrupt level to 15. */ + p0.l = lo(EVT15); + p0.h = hi(EVT15); + p1.l = _schedule_and_signal_from_int; + p1.h = _schedule_and_signal_from_int; + [p0] = p1; + csync; +#if defined(ANOMALY_05000281) + r0.l = lo(CONFIG_BOOT_LOAD); + r0.h = hi(CONFIG_BOOT_LOAD); + reti = r0; +#endif + r0 = 0x801f (z); + STI r0; + raise 15; /* raise evt15 to do signal or reschedule */ + rti; +2: + rts; + +ENTRY(_lower_to_irq14) +#if defined(ANOMALY_05000281) + r0.l = lo(CONFIG_BOOT_LOAD); + r0.h = hi(CONFIG_BOOT_LOAD); + reti = r0; +#endif + r0 = 0x401f; + sti r0; + raise 14; + rti; +ENTRY(_evt14_softirq) +#ifdef CONFIG_DEBUG_HWERR + r0 = 0x3f; + sti r0; +#else + cli r0; +#endif + [--sp] = RETI; + SP += 4; + rts; + +_schedule_and_signal_from_int: + /* To end up here, vector 15 was changed - so we have to change it + * back. + */ + p0.l = lo(EVT15); + p0.h = hi(EVT15); + p1.l = _evt_system_call; + p1.h = _evt_system_call; + [p0] = p1; + csync; + p1 = rets; + [sp + PT_RESERVED] = p1; + + p0.l = _irq_flags; + p0.h = _irq_flags; + r0 = [p0]; + sti r0; + + jump.s .Lresume_userspace; + +_schedule_and_signal: + SAVE_CONTEXT_SYSCALL + /* To end up here, vector 15 was changed - so we have to change it + * back. + */ + p0.l = lo(EVT15); + p0.h = hi(EVT15); + p1.l = _evt_system_call; + p1.h = _evt_system_call; + [p0] = p1; + csync; + p0.l = 1f; + p0.h = 1f; + [sp + PT_RESERVED] = P0; + call .Lresume_userspace; +1: + RESTORE_CONTEXT + rti; + +/* Make sure when we start, that the circular buffer is initialized properly + * R0 and P0 are call clobbered, so we can use them here. + */ +ENTRY(_init_exception_buff) + r0 = 0; + p0.h = _in_ptr_excause; + p0.l = _in_ptr_excause; + [p0] = r0; + p0.h = _out_ptr_excause; + p0.l = _out_ptr_excause; + [p0] = r0; + rts; + +/* + * Put these in the kernel data section - that should always be covered by + * a CPLB. This is needed to ensure we don't get double fault conditions + */ + +#ifdef CONFIG_SYSCALL_TAB_L1 +.section .l1.data +#else +.data +#endif +ALIGN +_extable: + /* entry for each EXCAUSE[5:0] + * This table bmust be in sync with the table in ./kernel/traps.c + * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined + */ + .long _ex_syscall; /* 0x00 - User Defined - Linux Syscall */ + .long _ex_soft_bp /* 0x01 - User Defined - Software breakpoint */ + .long _ex_trap_c /* 0x02 - User Defined */ + .long _ex_trap_c /* 0x03 - User Defined - Atomic test and set service */ + .long _ex_spinlock /* 0x04 - User Defined */ + .long _ex_trap_c /* 0x05 - User Defined */ + .long _ex_trap_c /* 0x06 - User Defined */ + .long _ex_trap_c /* 0x07 - User Defined */ + .long _ex_trap_c /* 0x08 - User Defined */ + .long _ex_trap_c /* 0x09 - User Defined */ + .long _ex_trap_c /* 0x0A - User Defined */ + .long _ex_trap_c /* 0x0B - User Defined */ + .long _ex_trap_c /* 0x0C - User Defined */ + .long _ex_trap_c /* 0x0D - User Defined */ + .long _ex_trap_c /* 0x0E - User Defined */ + .long _ex_trap_c /* 0x0F - User Defined */ + .long _ex_single_step /* 0x10 - HW Single step */ + .long _ex_trap_c /* 0x11 - Trace Buffer Full */ + .long _ex_trap_c /* 0x12 - Reserved */ + .long _ex_trap_c /* 0x13 - Reserved */ + .long _ex_trap_c /* 0x14 - Reserved */ + .long _ex_trap_c /* 0x15 - Reserved */ + .long _ex_trap_c /* 0x16 - Reserved */ + .long _ex_trap_c /* 0x17 - Reserved */ + .long _ex_trap_c /* 0x18 - Reserved */ + .long _ex_trap_c /* 0x19 - Reserved */ + .long _ex_trap_c /* 0x1A - Reserved */ + .long _ex_trap_c /* 0x1B - Reserved */ + .long _ex_trap_c /* 0x1C - Reserved */ + .long _ex_trap_c /* 0x1D - Reserved */ + .long _ex_trap_c /* 0x1E - Reserved */ + .long _ex_trap_c /* 0x1F - Reserved */ + .long _ex_trap_c /* 0x20 - Reserved */ + .long _ex_trap_c /* 0x21 - Undefined Instruction */ + .long _ex_trap_c /* 0x22 - Illegal Instruction Combination */ + .long _ex_dcplb /* 0x23 - Data CPLB Protection Violation */ + .long _ex_trap_c /* 0x24 - Data access misaligned */ + .long _ex_trap_c /* 0x25 - Unrecoverable Event */ + .long _ex_dcplb /* 0x26 - Data CPLB Miss */ + .long _ex_trap_c /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */ + .long _ex_trap_c /* 0x28 - Emulation Watchpoint */ + .long _ex_trap_c /* 0x29 - Instruction fetch access error (535 only) */ + .long _ex_trap_c /* 0x2A - Instruction fetch misaligned */ + .long _ex_icplb /* 0x2B - Instruction CPLB protection Violation */ + .long _ex_icplb /* 0x2C - Instruction CPLB miss */ + .long _ex_trap_c /* 0x2D - Instruction CPLB Multiple Hits */ + .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */ + .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */ + .long _ex_trap_c /* 0x2F - Reserved */ + .long _ex_trap_c /* 0x30 - Reserved */ + .long _ex_trap_c /* 0x31 - Reserved */ + .long _ex_trap_c /* 0x32 - Reserved */ + .long _ex_trap_c /* 0x33 - Reserved */ + .long _ex_trap_c /* 0x34 - Reserved */ + .long _ex_trap_c /* 0x35 - Reserved */ + .long _ex_trap_c /* 0x36 - Reserved */ + .long _ex_trap_c /* 0x37 - Reserved */ + .long _ex_trap_c /* 0x38 - Reserved */ + .long _ex_trap_c /* 0x39 - Reserved */ + .long _ex_trap_c /* 0x3A - Reserved */ + .long _ex_trap_c /* 0x3B - Reserved */ + .long _ex_trap_c /* 0x3C - Reserved */ + .long _ex_trap_c /* 0x3D - Reserved */ + .long _ex_trap_c /* 0x3E - Reserved */ + .long _ex_trap_c /* 0x3F - Reserved */ + +ALIGN +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_ni_syscall /* old 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_chown /* chown16 */ + .long _sys_ni_syscall /* old break syscall holder */ + .long _sys_ni_syscall /* old stat */ + .long _sys_lseek + .long _sys_getpid /* 20 */ + .long _sys_mount + .long _sys_ni_syscall /* old umount */ + .long _sys_setuid + .long _sys_getuid + .long _sys_stime /* 25 */ + .long _sys_ptrace + .long _sys_alarm + .long _sys_ni_syscall /* old fstat */ + .long _sys_pause + .long _sys_ni_syscall /* old 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_setgid + .long _sys_getgid + .long _sys_ni_syscall /* old sys_signal */ + .long _sys_geteuid /* geteuid16 */ + .long _sys_getegid /* 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 /* old old uname */ + .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_ni_syscall /* old sys_sigaction */ + .long _sys_sgetmask + .long _sys_ssetmask + .long _sys_setreuid /* setreuid16 */ /* 70 */ + .long _sys_setregid /* setregid16 */ + .long _sys_ni_syscall /* old sys_sigsuspend */ + .long _sys_ni_syscall /* old sys_sigpending */ + .long _sys_sethostname + .long _sys_setrlimit /* 75 */ + .long _sys_ni_syscall /* old getrlimit */ + .long _sys_getrusage + .long _sys_gettimeofday + .long _sys_settimeofday + .long _sys_getgroups /* getgroups16 */ /* 80 */ + .long _sys_setgroups /* setgroups16 */ + .long _sys_ni_syscall /* old_select */ + .long _sys_symlink + .long _sys_ni_syscall /* old lstat */ + .long _sys_readlink /* 85 */ + .long _sys_uselib + .long _sys_ni_syscall /* sys_swapon */ + .long _sys_reboot + .long _sys_ni_syscall /* old_readdir */ + .long _sys_ni_syscall /* sys_mmap */ /* 90 */ + .long _sys_munmap + .long _sys_truncate + .long _sys_ftruncate + .long _sys_fchmod + .long _sys_fchown /* 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 + .long _sys_ni_syscall /* old sys_socketcall */ + .long _sys_syslog + .long _sys_setitimer + .long _sys_getitimer /* 105 */ + .long _sys_newstat + .long _sys_newlstat + .long _sys_newfstat + .long _sys_ni_syscall /* old uname */ + .long _sys_ni_syscall /* iopl for i386 */ /* 110 */ + .long _sys_vhangup + .long _sys_ni_syscall /* obsolete idle() syscall */ + .long _sys_ni_syscall /* vm86old for i386 */ + .long _sys_wait4 + .long _sys_ni_syscall /* 115 */ /* sys_swapoff */ + .long _sys_sysinfo + .long _sys_ni_syscall /* old sys_ipc */ + .long _sys_fsync + .long _sys_ni_syscall /* old sys_sigreturn */ + .long _sys_clone /* 120 */ + .long _sys_setdomainname + .long _sys_newuname + .long _sys_ni_syscall /* old sys_modify_ldt */ + .long _sys_adjtimex + .long _sys_ni_syscall /* 125 */ /* sys_mprotect */ + .long _sys_ni_syscall /* old sys_sigprocmask */ + .long _sys_ni_syscall /* old "creat_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_ni_syscall /* 135 */ /* sys_sysfs */ + .long _sys_personality + .long _sys_ni_syscall /* for afs_syscall */ + .long _sys_setfsuid /* setfsuid16 */ + .long _sys_setfsgid /* setfsgid16 */ + .long _sys_llseek /* 140 */ + .long _sys_getdents + .long _sys_ni_syscall /* sys_select */ + .long _sys_flock + .long _sys_ni_syscall /* sys_msync */ + .long _sys_readv /* 145 */ + .long _sys_writev + .long _sys_getsid + .long _sys_fdatasync + .long _sys_sysctl + .long _sys_ni_syscall /* 150 */ /* sys_mlock */ + .long _sys_ni_syscall /* sys_munlock */ + .long _sys_ni_syscall /* sys_mlockall */ + .long _sys_ni_syscall /* 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_ni_syscall /* sys_mremap */ + .long _sys_setresuid /* setresuid16 */ + .long _sys_getresuid /* getresuid16 */ /* 165 */ + .long _sys_ni_syscall /* for vm86 */ + .long _sys_ni_syscall /* old "query_module" */ + .long _sys_ni_syscall /* sys_poll */ + .long _sys_ni_syscall /* sys_nfsservctl */ + .long _sys_setresgid /* setresgid16 */ /* 170 */ + .long _sys_getresgid /* 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_pread64 /* 180 */ + .long _sys_pwrite64 + .long _sys_lchown /* lchown16 */ + .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_chown + .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_lchown + .long _sys_setuid + .long _sys_setgid + .long _sys_setfsuid /* 215 */ + .long _sys_setfsgid + .long _sys_pivot_root + .long _sys_ni_syscall /* sys_mincore */ + .long _sys_ni_syscall /* sys_madvise */ + .long _sys_getdents64 /* 220 */ + .long _sys_fcntl64 + .long _sys_ni_syscall /* reserved for TUX */ + .long _sys_ni_syscall + .long _sys_gettid + .long _sys_ni_syscall /* 225 */ /* sys_readahead */ + .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 /* sys_set_thread_area */ + .long _sys_ni_syscall /* sys_get_thread_area */ + .long _sys_io_setup /* 245 */ + .long _sys_io_destroy + .long _sys_io_getevents + .long _sys_io_submit + .long _sys_io_cancel + .long _sys_ni_syscall /* 250 */ /* sys_alloc_hugepages */ + .long _sys_ni_syscall /* sys_freec_hugepages */ + .long _sys_exit_group + .long _sys_lookup_dcookie + .long _sys_bfin_spinlock + .long _sys_epoll_create /* 255 */ + .long _sys_epoll_ctl + .long _sys_epoll_wait + .long _sys_ni_syscall /* remap_file_pages */ + .long _sys_set_tid_address + .long _sys_timer_create /* 260 */ + .long _sys_timer_settime + .long _sys_timer_gettime + .long _sys_timer_getoverrun + .long _sys_timer_delete + .long _sys_clock_settime /* 265 */ + .long _sys_clock_gettime + .long _sys_clock_getres + .long _sys_clock_nanosleep + .long _sys_statfs64 + .long _sys_fstatfs64 /* 270 */ + .long _sys_tgkill + .long _sys_utimes + .long _sys_fadvise64_64 + .long _sys_ni_syscall /* vserver */ + .long _sys_ni_syscall /* 275, mbind */ + .long _sys_ni_syscall /* get_mempolicy */ + .long _sys_ni_syscall /* set_mempolicy */ + .long _sys_mq_open + .long _sys_mq_unlink + .long _sys_mq_timedsend /* 280 */ + .long _sys_mq_timedreceive + .long _sys_mq_notify + .long _sys_mq_getsetattr + .long _sys_ni_syscall /* kexec_load */ + .long _sys_waitid /* 285 */ + .long _sys_add_key + .long _sys_request_key + .long _sys_keyctl + .long _sys_ioprio_set + .long _sys_ioprio_get /* 290 */ + .long _sys_inotify_init + .long _sys_inotify_add_watch + .long _sys_inotify_rm_watch + .long _sys_ni_syscall /* migrate_pages */ + .long _sys_openat /* 295 */ + .long _sys_mkdirat + .long _sys_mknodat + .long _sys_fchownat + .long _sys_futimesat + .long _sys_fstatat64 /* 300 */ + .long _sys_unlinkat + .long _sys_renameat + .long _sys_linkat + .long _sys_symlinkat + .long _sys_readlinkat /* 305 */ + .long _sys_fchmodat + .long _sys_faccessat + .long _sys_pselect6 + .long _sys_ppoll + .long _sys_unshare /* 310 */ + .long _sys_sram_alloc + .long _sys_sram_free + .long _sys_dma_memcpy + .long _sys_accept + .long _sys_bind /* 315 */ + .long _sys_connect + .long _sys_getpeername + .long _sys_getsockname + .long _sys_getsockopt + .long _sys_listen /* 320 */ + .long _sys_recv + .long _sys_recvfrom + .long _sys_recvmsg + .long _sys_send + .long _sys_sendmsg /* 325 */ + .long _sys_sendto + .long _sys_setsockopt + .long _sys_shutdown + .long _sys_socket + .long _sys_socketpair /* 330 */ + .long _sys_semctl + .long _sys_semget + .long _sys_semop + .long _sys_msgctl + .long _sys_msgget /* 335 */ + .long _sys_msgrcv + .long _sys_msgsnd + .long _sys_shmat + .long _sys_shmctl + .long _sys_shmdt /* 340 */ + .long _sys_shmget + .rept NR_syscalls-(.-_sys_call_table)/4 + .long _sys_ni_syscall + .endr +_excpt_saved_imask: + .long 0; + +_exception_stack: + .rept 1024 + .long 0; + .endr +_exception_stack_top: + +#if defined(ANOMALY_05000261) +/* Used by the assembly entry point to work around an anomaly. */ +_last_cplb_fault_retx: + .long 0; +#endif +/* + * Single instructions can have multiple faults, which need to be + * handled by traps.c, in irq5. We store the exception cause to ensure + * we don't miss a double fault condition + */ +ENTRY(_in_ptr_excause) + .long 0; +ENTRY(_out_ptr_excause) + .long 0; +ALIGN +ENTRY(_excause_circ_buf) + .rept 4 + .long 0 + .endr |