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linux/arch/blackfin/mach-common/entry.S
Sonic Zhang d6a2989136 Blackfin arch: Fix bugs - Make kgdb code apparent to app debugging. 
- Skip single step if global interrupt disable bit is set.
 - Extend bernds' patch r4673 to skip single step in any interrupt entry
   that interrupts the code which is under single stepping. Bernds' patch
   only allow user space single stepping.

Singed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-08-05 18:28:26 +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;
#ifdef CONFIG_KGDB
/* Don't do single step in hardware exception handler */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5];
cc = bittst(r6, 4);
if cc jump _bfin_return_from_exception;
cc = bittst(r6, 5);
if cc jump _bfin_return_from_exception;
/* 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 1f;
.Ldo_single_step:
#else
/* If we were in user mode, do the single step normally. */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
r6 = [p5];
r7 = 0xffe0 (z);
r7 = r7 & r6;
cc = r7 == 0;
if !cc jump 1f;
#endif
/* Single stepping only a single instruction, so clear the trace
* bit here. */
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
jump _ex_trap_c;
1:
/*
* 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;
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
/* Fall through to _bfin_return_from_exception. */
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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