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android_kernel_xiaomi_sm8350/arch/blackfin/mach-common/entry.S
Sonic Zhang 0d1cdd7ab6 Blackfin arch: Fix bug - skip single step in high priority interrupt handler instead of disabling all interrupts in single step debugging. 
Skip single step if event priority of current instruction is higher than
that of the first instruction, from which gdb starts single step.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-07-26 18:54:38 +08:00

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/*
* 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
*/
/* NOTE: This code handles signal-recognition, which happens every time
* after a timer-interrupt and after each system call.
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/unistd.h>
#include <asm/blackfin.h>
#include <asm/errno.h>
#include <asm/fixed_code.h>
#include <asm/thread_info.h> /* TIF_NEED_RESCHED */
#include <asm/asm-offsets.h>
#include <asm/trace.h>
#include <asm/mach-common/context.S>
#if defined(CONFIG_BFIN_SCRATCH_REG_RETN)
# define EX_SCRATCH_REG RETN
#elif defined(CONFIG_BFIN_SCRATCH_REG_RETE)
# define EX_SCRATCH_REG RETE
#else
# define EX_SCRATCH_REG CYCLES
#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.
*/
#if ANOMALY_05000261
#define _ex_dviol _ex_workaround_261
#define _ex_dmiss _ex_workaround_261
#define _ex_dmult _ex_workaround_261
ENTRY(_ex_workaround_261)
/*
* 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.
*/
P4 = R7; /* Store EXCAUSE */
p5.l = _last_cplb_fault_retx;
p5.h = _last_cplb_fault_retx;
r7 = [p5];
r6 = retx;
[p5] = r6;
cc = r6 == r7;
if !cc jump _bfin_return_from_exception;
/* fall through */
R7 = P4;
R6 = 0x26; /* Data CPLB Miss */
cc = R6 == R7;
if cc jump _ex_dcplb_miss (BP);
R6 = 0x23; /* Data CPLB Miss */
cc = R6 == R7;
if cc jump _ex_dcplb_viol (BP);
/* Handle 0x23 Data CPLB Protection Violation
* and Data CPLB Multiple Hits - Linux Trap Zero
*/
jump _ex_trap_c;
ENDPROC(_ex_workaround_261)
#else
#ifdef CONFIG_MPU
#define _ex_dviol _ex_dcplb_viol
#else
#define _ex_dviol _ex_trap_c
#endif
#define _ex_dmiss _ex_dcplb_miss
#define _ex_dmult _ex_trap_c
#endif
ENTRY(_ex_dcplb_viol)
ENTRY(_ex_dcplb_miss)
ENTRY(_ex_icplb_miss)
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
SAVE_ALL_SYS
#ifdef CONFIG_MPU
/* We must load R1 here, _before_ DEBUG_HWTRACE_SAVE, since that
* will change the stack pointer. */
R0 = SEQSTAT;
R1 = SP;
#endif
DEBUG_HWTRACE_SAVE(p5, r7)
#ifdef CONFIG_MPU
sp += -12;
call _cplb_hdr;
sp += 12;
CC = R0 == 0;
IF !CC JUMP _handle_bad_cplb;
#else
call __cplb_hdr;
#endif
DEBUG_HWTRACE_RESTORE(p5, r7)
RESTORE_ALL_SYS
SP = EX_SCRATCH_REG;
rtx;
ENDPROC(_ex_icplb_miss)
ENTRY(_ex_syscall)
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
raise 15; /* invoked by TRAP #0, for sys call */
sp = EX_SCRATCH_REG;
rtx
ENDPROC(_ex_syscall)
ENTRY(_ex_soft_bp)
r7 = retx;
r7 += -2;
retx = r7;
jump.s _ex_trap_c;
ENDPROC(_ex_soft_bp)
ENTRY(_ex_single_step)
/* If we just returned from an interrupt, the single step event is
for the RTI instruction. */
r7 = retx;
r6 = reti;
cc = r7 == r6;
if cc jump _bfin_return_from_exception;
/* Don't do single step in hardware exception handler */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5];
cc = bittst(r6, 5);
if cc jump _bfin_return_from_exception;
#ifdef CONFIG_KGDB
/* skip single step if current interrupt priority is higher than
* that of the first instruction, from which gdb starts single step */
r6 >>= 6;
r7 = 10;
.Lfind_priority_start:
cc = bittst(r6, 0);
if cc jump .Lfind_priority_done;
r6 >>= 1;
r7 += -1;
cc = r7 == 0;
if cc jump .Lfind_priority_done;
jump.s .Lfind_priority_start;
.Lfind_priority_done:
p4.l = _debugger_step;
p4.h = _debugger_step;
r6 = [p4];
cc = r6 == 0;
if cc jump .Ldo_single_step;
r6 += -1;
cc = r6 < r7;
if cc jump _bfin_return_from_exception;
.Ldo_single_step:
#endif
/* If we were in user mode, do the single step normally. */
r6 = [p5];
r7 = 0xffe0 (z);
r7 = r7 & r6;
cc = r7 == 0;
if cc jump 1f;
/*
* We were in an interrupt handler. By convention, all of them save
* SYSCFG with their first instruction, so by checking whether our
* RETX points at the entry point, we can determine whether to allow
* a single step, or whether to clear SYSCFG.
*
* First, find out the interrupt level and the event vector for it.
*/
p5.l = lo(EVT0);
p5.h = hi(EVT0);
p5 += -4;
2:
r7 = rot r7 by -1;
p5 += 4;
if !cc jump 2b;
/* What we actually do is test for the _second_ instruction in the
* IRQ handler. That way, if there are insns following the restore
* of SYSCFG after leaving the handler, we will not turn off SYSCFG
* for them. */
r7 = [p5];
r7 += 2;
r6 = RETX;
cc = R7 == R6;
if !cc jump _bfin_return_from_exception;
1:
/* Single stepping only a single instruction, so clear the trace
* bit here. */
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
jump _ex_trap_c;
ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception)
#if ANOMALY_05000257
R7=LC0;
LC0=R7;
R7=LC1;
LC1=R7;
#endif
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
sp = EX_SCRATCH_REG;
rtx;
ENDPROC(_bfin_return_from_exception)
ENTRY(_handle_bad_cplb)
DEBUG_HWTRACE_RESTORE(p5, r7)
/* 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
*/
RESTORE_ALL_SYS
[--sp] = ASTAT;
[--sp] = (R7:6,P5:4);
ENTRY(_ex_replaceable)
nop;
ENTRY(_ex_trap_c)
/* Make sure we are not in a double fault */
p4.l = lo(IPEND);
p4.h = hi(IPEND);
r7 = [p4];
CC = BITTST (r7, 5);
if CC jump _double_fault;
/* 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;
p4.l = lo(DCPLB_FAULT_ADDR);
p4.h = hi(DCPLB_FAULT_ADDR);
r7 = [p4];
p5.h = _saved_dcplb_fault_addr;
p5.l = _saved_dcplb_fault_addr;
[p5] = r7;
r7 = [p4 + (ICPLB_FAULT_ADDR - DCPLB_FAULT_ADDR)];
p5.h = _saved_icplb_fault_addr;
p5.l = _saved_icplb_fault_addr;
[p5] = r7;
p4.l = _excpt_saved_stuff;
p4.h = _excpt_saved_stuff;
r6 = retx;
[p4] = r6;
r6 = SYSCFG;
[p4 + 4] = r6;
BITCLR(r6, 0);
SYSCFG = r6;
/* Disable all interrupts, but make sure level 5 is enabled so
* we can switch to that level. Save the old mask. */
cli r6;
[p4 + 8] = r6;
p4.l = lo(SAFE_USER_INSTRUCTION);
p4.h = hi(SAFE_USER_INSTRUCTION);
retx = p4;
r6 = 0x3f;
sti r6;
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
SP = EX_SCRATCH_REG;
raise 5;
rtx;
ENDPROC(_ex_trap_c)
/* We just realized we got an exception, while we were processing a different
* exception. This is a unrecoverable event, so crash
*/
ENTRY(_double_fault)
/* Turn caches & protection off, to ensure we don't get any more
* double exceptions
*/
P4.L = LO(IMEM_CONTROL);
P4.H = HI(IMEM_CONTROL);
R5 = [P4]; /* Control Register*/
BITCLR(R5,ENICPLB_P);
SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
.align 8;
[P4] = R5;
SSYNC;
P4.L = LO(DMEM_CONTROL);
P4.H = HI(DMEM_CONTROL);
R5 = [P4];
BITCLR(R5,ENDCPLB_P);
SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
.align 8;
[P4] = R5;
SSYNC;
/* Fix up the stack */
(R7:6,P5:4) = [sp++];
ASTAT = [sp++];
SP = EX_SCRATCH_REG;
/* We should be out of the exception stack, and back down into
* kernel or user space stack
*/
SAVE_ALL_SYS
/* The dumping functions expect the return address in the RETI
* slot. */
r6 = retx;
[sp + PT_PC] = r6;
r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
SP += -12;
call _double_fault_c;
SP += 12;
.L_double_fault_panic:
JUMP .L_double_fault_panic
ENDPROC(_double_fault)
ENTRY(_exception_to_level5)
SAVE_ALL_SYS
p4.l = _excpt_saved_stuff;
p4.h = _excpt_saved_stuff;
r6 = [p4];
[sp + PT_PC] = r6;
r6 = [p4 + 4];
[sp + PT_SYSCFG] = r6;
/* Restore interrupt mask. We haven't pushed RETI, so this
* doesn't enable interrupts until we return from this handler. */
r6 = [p4 + 8];
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 */
r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
SP += -12;
call _trap_c;
SP += 12;
call _ret_from_exception;
RESTORE_ALL_SYS
rti;
ENDPROC(_exception_to_level5)
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).
*/
EX_SCRATCH_REG = sp;
sp.l = _exception_stack_top;
sp.h = _exception_stack_top;
/* Try to deal with syscalls quickly. */
[--sp] = ASTAT;
[--sp] = (R7:6,P5:4);
r7 = SEQSTAT; /* reason code is in bit 5:0 */
r6.l = lo(SEQSTAT_EXCAUSE);
r6.h = hi(SEQSTAT_EXCAUSE);
r7 = r7 & r6;
p5.h = _ex_table;
p5.l = _ex_table;
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;
ENDPROC(_trap)
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;
ENDPROC(_kernel_execve)
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;
ENDPROC(_system_call)
_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;
ENDPROC(_sys_trace)
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;
ENDPROC(_resume)
ENTRY(_ret_from_exception)
p2.l = lo(IPEND);
p2.h = hi(IPEND);
csync;
r0 = [p2];
[sp + PT_IPEND] = r0;
1:
r2 = LO(~0x37) (Z);
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;
ENDPROC(_ret_from_exception)
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 ANOMALY_05000281
r0.l = lo(SAFE_USER_INSTRUCTION);
r0.h = hi(SAFE_USER_INSTRUCTION);
reti = r0;
#endif
r0 = 0x801f (z);
STI r0;
raise 15; /* raise evt15 to do signal or reschedule */
rti;
2:
rts;
ENDPROC(_return_from_int)
ENTRY(_lower_to_irq14)
#if ANOMALY_05000281
r0.l = lo(SAFE_USER_INSTRUCTION);
r0.h = hi(SAFE_USER_INSTRUCTION);
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;
/* Set orig_p0 to -1 to indicate this isn't the end of a syscall. */
r0 = -1 (x);
[sp + PT_ORIG_P0] = r0;
p1 = rets;
[sp + PT_RESERVED] = p1;
p0.l = _irq_flags;
p0.h = _irq_flags;
r0 = [p0];
sti r0;
r0 = sp;
sp += -12;
call _finish_atomic_sections;
sp += 12;
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;
ENDPROC(_lower_to_irq14)
/* We handle this 100% in exception space - to reduce overhead
* Only potiential problem is if the software buffer gets swapped out of the
* CPLB table - then double fault. - so we don't let this happen in other places
*/
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
ENTRY(_ex_trace_buff_full)
[--sp] = P3;
[--sp] = P2;
[--sp] = LC0;
[--sp] = LT0;
[--sp] = LB0;
P5.L = _trace_buff_offset;
P5.H = _trace_buff_offset;
P3 = [P5]; /* trace_buff_offset */
P5.L = lo(TBUFSTAT);
P5.H = hi(TBUFSTAT);
R7 = [P5];
R7 <<= 1; /* double, since we need to read twice */
LC0 = R7;
R7 <<= 2; /* need to shift over again,
* to get the number of bytes */
P5.L = lo(TBUF);
P5.H = hi(TBUF);
R6 = ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*1024) - 1;
P2 = R7;
P3 = P3 + P2;
R7 = P3;
R7 = R7 & R6;
P3 = R7;
P2.L = _trace_buff_offset;
P2.H = _trace_buff_offset;
[P2] = P3;
P2.L = _software_trace_buff;
P2.H = _software_trace_buff;
LSETUP (.Lstart, .Lend) LC0;
.Lstart:
R7 = [P5]; /* read TBUF */
P4 = P3 + P2;
[P4] = R7;
P3 += -4;
R7 = P3;
R7 = R7 & R6;
.Lend:
P3 = R7;
LB0 = [sp++];
LT0 = [sp++];
LC0 = [sp++];
P2 = [sp++];
P3 = [sp++];
jump _bfin_return_from_exception;
ENDPROC(_ex_trace_buff_full)
#if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4
.data
#else
.section .l1.data.B
#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */
ENTRY(_trace_buff_offset)
.long 0;
ALIGN
ENTRY(_software_trace_buff)
.rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256);
.long 0
.endr
#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */
#if CONFIG_EARLY_PRINTK
__INIT
ENTRY(_early_trap)
SAVE_ALL_SYS
trace_buffer_stop(p0,r0);
/* Turn caches off, to ensure we don't get double exceptions */
P4.L = LO(IMEM_CONTROL);
P4.H = HI(IMEM_CONTROL);
R5 = [P4]; /* Control Register*/
BITCLR(R5,ENICPLB_P);
CLI R1;
SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
.align 8;
[P4] = R5;
SSYNC;
P4.L = LO(DMEM_CONTROL);
P4.H = HI(DMEM_CONTROL);
R5 = [P4];
BITCLR(R5,ENDCPLB_P);
SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
.align 8;
[P4] = R5;
SSYNC;
STI R1;
r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
r1 = RETX;
SP += -12;
call _early_trap_c;
SP += 12;
ENDPROC(_early_trap)
__FINIT
#endif /* CONFIG_EARLY_PRINTK */
/*
* 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
ENTRY(_ex_table)
/* entry for each EXCAUSE[5:0]
* This table must 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_replaceable /* 0x02 - User Defined */
.long _ex_trap_c /* 0x03 - User Defined - userspace stack overflow */
.long _ex_trap_c /* 0x04 - User Defined - dump trace buffer */
.long _ex_replaceable /* 0x05 - User Defined */
.long _ex_replaceable /* 0x06 - User Defined */
.long _ex_replaceable /* 0x07 - User Defined */
.long _ex_replaceable /* 0x08 - User Defined */
.long _ex_replaceable /* 0x09 - User Defined */
.long _ex_replaceable /* 0x0A - User Defined */
.long _ex_replaceable /* 0x0B - User Defined */
.long _ex_replaceable /* 0x0C - User Defined */
.long _ex_replaceable /* 0x0D - User Defined */
.long _ex_replaceable /* 0x0E - User Defined */
.long _ex_replaceable /* 0x0F - User Defined */
.long _ex_single_step /* 0x10 - HW Single step */
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
.long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
#else
.long _ex_trap_c /* 0x11 - Trace Buffer Full */
#endif
.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_dviol /* 0x23 - Data CPLB Protection Violation */
.long _ex_trap_c /* 0x24 - Data access misaligned */
.long _ex_trap_c /* 0x25 - Unrecoverable Event */
.long _ex_dmiss /* 0x26 - Data CPLB Miss */
.long _ex_dmult /* 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_trap_c /* 0x2B - Instruction CPLB protection Violation */
.long _ex_icplb_miss /* 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 */
END(_ex_table)
ENTRY(_sys_call_table)
.long _sys_restart_syscall /* 0 */
.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_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_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_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 /* 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
.long _sys_splice
.long _sys_sync_file_range
.long _sys_tee
.long _sys_vmsplice /* 345 */
.long _sys_epoll_pwait
.long _sys_utimensat
.long _sys_signalfd
.long _sys_timerfd_create
.long _sys_eventfd /* 350 */
.long _sys_pread64
.long _sys_pwrite64
.long _sys_fadvise64
.long _sys_set_robust_list
.long _sys_get_robust_list /* 355 */
.long _sys_fallocate
.long _sys_semtimedop
.long _sys_timerfd_settime
.long _sys_timerfd_gettime
.rept NR_syscalls-(.-_sys_call_table)/4
.long _sys_ni_syscall
.endr
/*
* Used to save the real RETX, IMASK and SYSCFG when temporarily
* storing safe values across the transition from exception to IRQ5.
*/
_excpt_saved_stuff:
.long 0;
.long 0;
.long 0;
_exception_stack:
.rept 1024
.long 0;
.endr
_exception_stack_top:
#if ANOMALY_05000261
/* Used by the assembly entry point to work around an anomaly. */
_last_cplb_fault_retx:
.long 0;
#endif
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