diff options
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/asm-offsets.c | 10 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 87 | ||||
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/thumbee.c | 81 |
5 files changed, 165 insertions, 19 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 00d44c6fbfe9..d5be3f7ac0e3 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o obj-$(CONFIG_ATAGS_PROC) += atags.o obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o +obj-$(CONFIG_ARM_THUMBEE) += thumbee.o obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312 diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c index 3278e713c32a..0a0d2479274b 100644 --- a/arch/arm/kernel/asm-offsets.c +++ b/arch/arm/kernel/asm-offsets.c @@ -58,6 +58,9 @@ int main(void) DEFINE(TI_TP_VALUE, offsetof(struct thread_info, tp_value)); DEFINE(TI_FPSTATE, offsetof(struct thread_info, fpstate)); DEFINE(TI_VFPSTATE, offsetof(struct thread_info, vfpstate)); +#ifdef CONFIG_ARM_THUMBEE + DEFINE(TI_THUMBEE_STATE, offsetof(struct thread_info, thumbee_state)); +#endif #ifdef CONFIG_IWMMXT DEFINE(TI_IWMMXT_STATE, offsetof(struct thread_info, fpstate.iwmmxt)); #endif @@ -108,5 +111,12 @@ int main(void) DEFINE(PROCINFO_INITFUNC, offsetof(struct proc_info_list, __cpu_flush)); DEFINE(PROCINFO_MM_MMUFLAGS, offsetof(struct proc_info_list, __cpu_mm_mmu_flags)); DEFINE(PROCINFO_IO_MMUFLAGS, offsetof(struct proc_info_list, __cpu_io_mmu_flags)); + BLANK(); +#ifdef MULTI_DABORT + DEFINE(PROCESSOR_DABT_FUNC, offsetof(struct processor, _data_abort)); +#endif +#ifdef MULTI_PABORT + DEFINE(PROCESSOR_PABT_FUNC, offsetof(struct processor, _prefetch_abort)); +#endif return 0; } diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 65cef872c5f2..7dca225752c1 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -166,12 +166,12 @@ __dabt_svc: @ The abort handler must return the aborted address in r0, and @ the fault status register in r1. r9 must be preserved. @ -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT ldr r4, .LCprocfns mov lr, pc - ldr pc, [r4] + ldr pc, [r4, #PROCESSOR_DABT_FUNC] #else - bl CPU_ABORT_HANDLER + bl CPU_DABORT_HANDLER #endif @ @@ -283,7 +283,6 @@ __pabt_svc: mrs r9, cpsr tst r3, #PSR_I_BIT biceq r9, r9, #PSR_I_BIT - msr cpsr_c, r9 @ @ set args, then call main handler @@ -291,7 +290,15 @@ __pabt_svc: @ r0 - address of faulting instruction @ r1 - pointer to registers on stack @ - mov r0, r2 @ address (pc) +#ifdef MULTI_PABORT + mov r0, r2 @ pass address of aborted instruction. + ldr r4, .LCprocfns + mov lr, pc + ldr pc, [r4, #PROCESSOR_PABT_FUNC] +#else + CPU_PABORT_HANDLER(r0, r2) +#endif + msr cpsr_c, r9 @ Maybe enable interrupts mov r1, sp @ regs bl do_PrefetchAbort @ call abort handler @@ -310,7 +317,7 @@ __pabt_svc: .align 5 .LCcralign: .word cr_alignment -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT .LCprocfns: .word processor #endif @@ -390,12 +397,12 @@ __dabt_usr: @ The abort handler must return the aborted address in r0, and @ the fault status register in r1. @ -#ifdef MULTI_ABORT +#ifdef MULTI_DABORT ldr r4, .LCprocfns mov lr, pc - ldr pc, [r4] + ldr pc, [r4, #PROCESSOR_DABT_FUNC] #else - bl CPU_ABORT_HANDLER + bl CPU_DABORT_HANDLER #endif @ @@ -441,10 +448,6 @@ __irq_usr: __und_usr: usr_entry - tst r3, #PSR_T_BIT @ Thumb mode? - bne __und_usr_unknown @ ignore FP - sub r4, r2, #4 - @ @ fall through to the emulation code, which returns using r9 if @ it has emulated the instruction, or the more conventional lr @@ -454,7 +457,24 @@ __und_usr: @ adr r9, ret_from_exception adr lr, __und_usr_unknown -1: ldrt r0, [r4] + tst r3, #PSR_T_BIT @ Thumb mode? + subeq r4, r2, #4 @ ARM instr at LR - 4 + subne r4, r2, #2 @ Thumb instr at LR - 2 +1: ldreqt r0, [r4] + beq call_fpe + @ Thumb instruction +#if __LINUX_ARM_ARCH__ >= 7 +2: ldrht r5, [r4], #2 + and r0, r5, #0xf800 @ mask bits 111x x... .... .... + cmp r0, #0xe800 @ 32bit instruction if xx != 0 + blo __und_usr_unknown +3: ldrht r0, [r4] + add r2, r2, #2 @ r2 is PC + 2, make it PC + 4 + orr r0, r0, r5, lsl #16 +#else + b __und_usr_unknown +#endif + @ @ fallthrough to call_fpe @ @@ -463,10 +483,14 @@ __und_usr: * The out of line fixup for the ldrt above. */ .section .fixup, "ax" -2: mov pc, r9 +4: mov pc, r9 .previous .section __ex_table,"a" - .long 1b, 2b + .long 1b, 4b +#if __LINUX_ARM_ARCH__ >= 7 + .long 2b, 4b + .long 3b, 4b +#endif .previous /* @@ -493,9 +517,16 @@ __und_usr: * r10 = this threads thread_info structure. * lr = unrecognised instruction return address */ + @ + @ Fall-through from Thumb-2 __und_usr + @ +#ifdef CONFIG_NEON + adr r6, .LCneon_thumb_opcodes + b 2f +#endif call_fpe: #ifdef CONFIG_NEON - adr r6, .LCneon_opcodes + adr r6, .LCneon_arm_opcodes 2: ldr r7, [r6], #4 @ mask value cmp r7, #0 @ end mask? @@ -512,6 +543,7 @@ call_fpe: 1: #endif tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27 + tstne r0, #0x04000000 @ bit 26 set on both ARM and Thumb-2 #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710) and r8, r0, #0x0f000000 @ mask out op-code bits teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)? @@ -563,7 +595,7 @@ call_fpe: #ifdef CONFIG_NEON .align 6 -.LCneon_opcodes: +.LCneon_arm_opcodes: .word 0xfe000000 @ mask .word 0xf2000000 @ opcode @@ -572,6 +604,16 @@ call_fpe: .word 0x00000000 @ mask .word 0x00000000 @ opcode + +.LCneon_thumb_opcodes: + .word 0xef000000 @ mask + .word 0xef000000 @ opcode + + .word 0xff100000 @ mask + .word 0xf9000000 @ opcode + + .word 0x00000000 @ mask + .word 0x00000000 @ opcode #endif do_fpe: @@ -605,8 +647,15 @@ __und_usr_unknown: __pabt_usr: usr_entry +#ifdef MULTI_PABORT + mov r0, r2 @ pass address of aborted instruction. + ldr r4, .LCprocfns + mov lr, pc + ldr pc, [r4, #PROCESSOR_PABT_FUNC] +#else + CPU_PABORT_HANDLER(r0, r2) +#endif enable_irq @ Enable interrupts - mov r0, r2 @ address (pc) mov r1, sp @ regs bl do_PrefetchAbort @ call abort handler /* fall through */ diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 6c90c50a9ee3..597ed00a08d8 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -352,6 +352,11 @@ sys_mmap2: b do_mmap2 #endif +ENTRY(pabort_ifar) + mrc p15, 0, r0, cr6, cr0, 2 +ENTRY(pabort_noifar) + mov pc, lr + #ifdef CONFIG_OABI_COMPAT /* diff --git a/arch/arm/kernel/thumbee.c b/arch/arm/kernel/thumbee.c new file mode 100644 index 000000000000..df3f6b7ebcea --- /dev/null +++ b/arch/arm/kernel/thumbee.c @@ -0,0 +1,81 @@ +/* + * arch/arm/kernel/thumbee.c + * + * Copyright (C) 2008 ARM Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/init.h> + +#include <asm/thread_notify.h> + +/* + * Access to the ThumbEE Handler Base register + */ +static inline unsigned long teehbr_read() +{ + unsigned long v; + asm("mrc p14, 6, %0, c1, c0, 0\n" : "=r" (v)); + return v; +} + +static inline void teehbr_write(unsigned long v) +{ + asm("mcr p14, 6, %0, c1, c0, 0\n" : : "r" (v)); +} + +static int thumbee_notifier(struct notifier_block *self, unsigned long cmd, void *t) +{ + struct thread_info *thread = t; + + switch (cmd) { + case THREAD_NOTIFY_FLUSH: + thread->thumbee_state = 0; + break; + case THREAD_NOTIFY_SWITCH: + current_thread_info()->thumbee_state = teehbr_read(); + teehbr_write(thread->thumbee_state); + break; + } + + return NOTIFY_DONE; +} + +static struct notifier_block thumbee_notifier_block = { + .notifier_call = thumbee_notifier, +}; + +static int __init thumbee_init(void) +{ + unsigned long pfr0; + unsigned int cpu_arch = cpu_architecture(); + + if (cpu_arch < CPU_ARCH_ARMv7) + return 0; + + /* processor feature register 0 */ + asm("mrc p15, 0, %0, c0, c1, 0\n" : "=r" (pfr0)); + if ((pfr0 & 0x0000f000) != 0x00001000) + return 0; + + printk(KERN_INFO "ThumbEE CPU extension supported.\n"); + elf_hwcap |= HWCAP_THUMBEE; + thread_register_notifier(&thumbee_notifier_block); + + return 0; +} + +late_initcall(thumbee_init); |