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-rw-r--r--arch/blackfin/mach-common/entry.S141
1 files changed, 67 insertions, 74 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index bde6dc4e261..88de053bbe8 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -36,6 +36,7 @@
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/unistd.h>
+#include <linux/threads.h>
#include <asm/blackfin.h>
#include <asm/errno.h>
#include <asm/fixed_code.h>
@@ -75,11 +76,11 @@ ENTRY(_ex_workaround_261)
* handle it.
*/
P4 = R7; /* Store EXCAUSE */
- p5.l = _last_cplb_fault_retx;
- p5.h = _last_cplb_fault_retx;
- r7 = [p5];
+
+ GET_PDA(p5, r7);
+ r7 = [p5 + PDA_LFRETX];
r6 = retx;
- [p5] = r6;
+ [p5 + PDA_LFRETX] = r6;
cc = r6 == r7;
if !cc jump _bfin_return_from_exception;
/* fall through */
@@ -111,24 +112,21 @@ 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 leave the previously pushed ASTAT on the stack. */
+ SAVE_CONTEXT_CPLB
+
/* 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
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* While we were processing this, did we double fault? */
@@ -142,7 +140,8 @@ ENTRY(_ex_icplb_miss)
#endif
DEBUG_HWTRACE_RESTORE(p5, r7)
- RESTORE_ALL_SYS
+ RESTORE_CONTEXT_CPLB
+ ASTAT = [SP++];
SP = EX_SCRATCH_REG;
rtx;
ENDPROC(_ex_icplb_miss)
@@ -152,13 +151,6 @@ ENTRY(_ex_syscall)
jump.s _bfin_return_from_exception;
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. */
@@ -297,9 +289,8 @@ ENTRY(_handle_bad_cplb)
* 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;
+ RESTORE_CONTEXT_CPLB
+ /* ASTAT is still on the stack, where it is needed. */
[--sp] = (R7:6,P5:4);
ENTRY(_ex_replaceable)
@@ -324,7 +315,9 @@ ENTRY(_ex_trap_c)
[p4] = p5;
csync;
+ GET_PDA(p5, r6);
#ifndef CONFIG_DEBUG_DOUBLEFAULT
+
/*
* Save these registers, as they are only valid in exception context
* (where we are now - as soon as we defer to IRQ5, they can change)
@@ -335,29 +328,25 @@ ENTRY(_ex_trap_c)
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;
+ [p5 + PDA_DCPLB] = 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 = lo(ICPLB_FAULT_ADDR);
+ p4.h = hi(ICPLB_FAULT_ADDR);
+ r6 = [p4];
+ [p5 + PDA_ICPLB] = r6;
r6 = retx;
- p4.l = _saved_retx;
- p4.h = _saved_retx;
- [p4] = r6;
+ [p5 + PDA_RETX] = r6;
#endif
r6 = SYSCFG;
- [p4 + 4] = r6;
+ [p5 + PDA_SYSCFG] = 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;
+ [p5 + PDA_EXIMASK] = r6;
p4.l = lo(SAFE_USER_INSTRUCTION);
p4.h = hi(SAFE_USER_INSTRUCTION);
@@ -371,9 +360,10 @@ ENTRY(_ex_trap_c)
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
+ * exception. This is a unrecoverable event, so crash.
+ * Note: this cannot be ENTRY() as we jump here with "if cc jump" ...
*/
-ENTRY(_double_fault)
+_double_fault:
/* Turn caches & protection off, to ensure we don't get any more
* double exceptions
*/
@@ -424,17 +414,16 @@ ENDPROC(_double_fault)
ENTRY(_exception_to_level5)
SAVE_ALL_SYS
- p4.l = _saved_retx;
- p4.h = _saved_retx;
- r6 = [p4];
+ GET_PDA(p4, r7); /* Fetch current PDA */
+ r6 = [p4 + PDA_RETX];
[sp + PT_PC] = r6;
- r6 = [p4 + 4];
+ r6 = [p4 + PDA_SYSCFG];
[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];
+ r6 = [p4 + PDA_EXIMASK];
sti r6;
/* Restore the hardware error vector. */
@@ -478,8 +467,8 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
* scratch register (for want of a better option).
*/
EX_SCRATCH_REG = sp;
- sp.l = _exception_stack_top;
- sp.h = _exception_stack_top;
+ GET_PDA_SAFE(sp);
+ sp = [sp + PDA_EXSTACK]
/* Try to deal with syscalls quickly. */
[--sp] = ASTAT;
[--sp] = (R7:6,P5:4);
@@ -501,27 +490,22 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
* but they are not very interesting, so don't save them
*/
+ GET_PDA(p5, r7);
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;
+ [p5 + PDA_DCPLB] = 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 = lo(ICPLB_FAULT_ADDR);
+ p4.h = hi(ICPLB_FAULT_ADDR);
+ r7 = [p4];
+ [p5 + PDA_ICPLB] = r7;
- p4.l = _saved_retx;
- p4.h = _saved_retx;
r6 = retx;
- [p4] = r6;
+ [p5 + PDA_RETX] = r6;
r7 = SEQSTAT; /* reason code is in bit 5:0 */
- p4.l = _saved_seqstat;
- p4.h = _saved_seqstat;
- [p4] = r7;
+ [p5 + PDA_SEQSTAT] = r7;
#else
r7 = SEQSTAT; /* reason code is in bit 5:0 */
#endif
@@ -546,11 +530,11 @@ ENTRY(_kernel_execve)
p0 = sp;
r3 = SIZEOF_PTREGS / 4;
r4 = 0(x);
-0:
+.Lclear_regs:
[p0++] = r4;
r3 += -1;
cc = r3 == 0;
- if !cc jump 0b (bp);
+ if !cc jump .Lclear_regs (bp);
p0 = sp;
sp += -16;
@@ -558,7 +542,7 @@ ENTRY(_kernel_execve)
call _do_execve;
SP += 16;
cc = r0 == 0;
- if ! cc jump 1f;
+ if ! cc jump .Lexecve_failed;
/* Success. Copy our temporary pt_regs to the top of the kernel
* stack and do a normal exception return.
*/
@@ -574,12 +558,12 @@ ENTRY(_kernel_execve)
p0 = fp;
r4 = [p0--];
r3 = SIZEOF_PTREGS / 4;
-0:
+.Lcopy_regs:
r4 = [p0--];
[p1--] = r4;
r3 += -1;
cc = r3 == 0;
- if ! cc jump 0b (bp);
+ if ! cc jump .Lcopy_regs (bp);
r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
p1 = r0;
@@ -591,7 +575,7 @@ ENTRY(_kernel_execve)
RESTORE_CONTEXT;
rti;
-1:
+.Lexecve_failed:
unlink;
rts;
ENDPROC(_kernel_execve)
@@ -925,9 +909,14 @@ _schedule_and_signal_from_int:
p1 = rets;
[sp + PT_RESERVED] = p1;
- p0.l = _irq_flags;
- p0.h = _irq_flags;
+#ifdef CONFIG_SMP
+ GET_PDA(p0, r0); /* Fetch current PDA (can't migrate to other CPU here) */
+ r0 = [p0 + PDA_IRQFLAGS];
+#else
+ p0.l = _bfin_irq_flags;
+ p0.h = _bfin_irq_flags;
r0 = [p0];
+#endif
sti r0;
r0 = sp;
@@ -1091,7 +1080,7 @@ ENTRY(_ex_table)
* 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 /* 0x01 - User Defined - Software breakpoint */
#ifdef CONFIG_KGDB
.long _ex_trap_c /* 0x02 - User Defined - KGDB initial connection
and break signal trap */
@@ -1539,14 +1528,18 @@ ENTRY(_sys_call_table)
.endr
END(_sys_call_table)
-_exception_stack:
- .rept 1024
- .long 0;
+#ifdef CONFIG_EXCEPTION_L1_SCRATCH
+/* .section .l1.bss.scratch */
+.set _exception_stack_top, L1_SCRATCH_START + L1_SCRATCH_LENGTH
+#else
+#ifdef CONFIG_SYSCALL_TAB_L1
+.section .l1.bss
+#else
+.bss
+#endif
+ENTRY(_exception_stack)
+ .rept 1024 * NR_CPUS
+ .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
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-29 01:24:15 +0000