diff options
Diffstat (limited to 'arch/blackfin/mach-common/entry.S')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 128 |
1 files changed, 39 insertions, 89 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index cee54cebbc6..f2fb87e9a46 100644 --- a/arch/blackfin/mach-common/entry.S +++ b/arch/blackfin/mach-common/entry.S @@ -38,6 +38,7 @@ #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> @@ -52,15 +53,6 @@ # define EX_SCRATCH_REG CYCLES #endif -#if ANOMALY_05000281 -ENTRY(_safe_speculative_execution) - NOP; - NOP; - NOP; - jump _safe_speculative_execution; -ENDPROC(_safe_speculative_execution) -#endif - #ifdef CONFIG_EXCPT_IRQ_SYSC_L1 .section .l1.text #else @@ -121,10 +113,14 @@ ENTRY(_ex_icplb_miss) (R7:6,P5:4) = [sp++]; ASTAT = [sp++]; SAVE_ALL_SYS - DEBUG_HWTRACE_SAVE(p5, r7) #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; @@ -191,6 +187,7 @@ ENTRY(_bfin_return_from_exception) 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 @@ -225,6 +222,26 @@ ENTRY(_ex_trap_c) [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 = __retx; + p4.h = __retx; + r6 = retx; + [p4] = r6; + p4.l = lo(SAFE_USER_INSTRUCTION); + p4.h = hi(SAFE_USER_INSTRUCTION); + retx = p4; + /* Disable all interrupts, but make sure level 5 is enabled so * we can switch to that level. Save the old mask. */ cli r6; @@ -234,23 +251,6 @@ ENTRY(_ex_trap_c) 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; - (R7:6,P5:4) = [sp++]; ASTAT = [sp++]; SP = EX_SCRATCH_REG; @@ -307,6 +307,11 @@ ENDPROC(_double_fault) ENTRY(_exception_to_level5) SAVE_ALL_SYS + p4.l = __retx; + p4.h = __retx; + r6 = [p4]; + [sp + PT_PC] = r6; + /* 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; @@ -328,42 +333,11 @@ ENTRY(_exception_to_level5) 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 + PT_SEQSTAT] = 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; @@ -727,8 +701,8 @@ ENTRY(_return_from_int) [p0] = p1; csync; #if ANOMALY_05000281 - r0.l = _safe_speculative_execution; - r0.h = _safe_speculative_execution; + r0.l = lo(SAFE_USER_INSTRUCTION); + r0.h = hi(SAFE_USER_INSTRUCTION); reti = r0; #endif r0 = 0x801f (z); @@ -741,8 +715,8 @@ ENDPROC(_return_from_int) ENTRY(_lower_to_irq14) #if ANOMALY_05000281 - r0.l = _safe_speculative_execution; - r0.h = _safe_speculative_execution; + r0.l = lo(SAFE_USER_INSTRUCTION); + r0.h = hi(SAFE_USER_INSTRUCTION); reti = r0; #endif r0 = 0x401f; @@ -809,20 +783,6 @@ _schedule_and_signal: rti; ENDPROC(_lower_to_irq14) -/* 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; -ENDPROC(_init_exception_buff) - /* 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 @@ -1398,17 +1358,7 @@ _exception_stack_top: _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) + /* Used to save the real RETX when temporarily storing a safe + * return address. */ +__retx: .long 0; -ENTRY(_out_ptr_excause) - .long 0; -ALIGN -ENTRY(_excause_circ_buf) - .rept 4 - .long 0 - .endr |