diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-12 15:26:48 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-12 15:26:48 -0800 |
commit | 26ceb127f7bcf473db926c6a026b18ddd6f274e8 (patch) | |
tree | a8944a9c0730c409b0cfb17c541085face068556 /arch/arm/kernel | |
parent | 8d14066755592a2906b4f2378aeb5471b602d3cb (diff) | |
parent | e9f2d6d66037cdf97487491e04053f411abc5d16 (diff) |
Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM updates from Russell King:
"The major updates included in this update are:
- Clang compatible stack pointer accesses by Behan Webster.
- SA11x0 updates from Dmitry Eremin-Solenikov.
- kgdb handling of breakpoints with read-only text/modules
- Support for Privileged-no-execute feature on ARMv7 to prevent
userspace code execution by the kernel.
- AMBA primecell bus handling of irq-safe runtime PM
- Unwinding support for memset/memzero/memmove/memcpy functions
- VFP fixes for Krait CPUs and improvements in detecting the VFP
architecture
- A number of code cleanups (using pr_*, removing or reducing the
severity of a couple of kernel messages, splitting ftrace asm code
out to a separate file, etc.)
- Add machine name to stack dump output"
* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (62 commits)
ARM: 8247/2: pcmcia: sa1100: make use of device clock
ARM: 8246/2: pcmcia: sa1111: provide device clock
ARM: 8245/1: pcmcia: soc-common: enable/disable socket clocks
ARM: 8244/1: fbdev: sa1100fb: make use of device clock
ARM: 8243/1: sa1100: add a clock alias for sa1111 pcmcia device
ARM: 8242/1: sa1100: add cpu clock
ARM: 8221/1: PJ4: allow building in Thumb-2 mode
ARM: 8234/1: sa1100: reorder IRQ handling code
ARM: 8233/1: sa1100: switch to hwirq usage
ARM: 8232/1: sa1100: merge GPIO multiplexer IRQ to "normal" irq domain
ARM: 8231/1: sa1100: introduce irqdomains support
ARM: 8230/1: sa1100: shift IRQs by one
ARM: 8229/1: sa1100: replace irq numbers with names in irq driver
ARM: 8228/1: sa1100: drop entry-macro.S
ARM: 8227/1: sa1100: switch to MULTI_IRQ_HANDLER
ARM: 8241/1: Update processor_modes for hyp and monitor mode
ARM: 8240/1: MCPM: document mcpm_sync_init()
ARM: 8239/1: Introduce {set,clear}_pte_bit
ARM: 8238/1: mm: Refine set_memory_* functions
ARM: 8237/1: fix flush_pfn_alias
...
Diffstat (limited to 'arch/arm/kernel')
35 files changed, 495 insertions, 356 deletions
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 8dcbed5016ac..f290ac892a95 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -47,6 +47,7 @@ endif obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o obj-$(CONFIG_ARM_ARCH_TIMER) += arch_timer.o +obj-$(CONFIG_FUNCTION_TRACER) += entry-ftrace.o obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o @@ -67,7 +68,7 @@ test-kprobes-objs += kprobes-test-arm.o endif obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o obj-$(CONFIG_ARM_THUMBEE) += thumbee.o -obj-$(CONFIG_KGDB) += kgdb.o +obj-$(CONFIG_KGDB) += kgdb.o patch.o obj-$(CONFIG_ARM_UNWIND) += unwind.o obj-$(CONFIG_HAVE_TCM) += tcm.o obj-$(CONFIG_OF) += devtree.o @@ -84,6 +85,7 @@ obj-$(CONFIG_CPU_PJ4B) += pj4-cp0.o obj-$(CONFIG_IWMMXT) += iwmmxt.o obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o +CFLAGS_pj4-cp0.o := -marm AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o diff --git a/arch/arm/kernel/atags_compat.c b/arch/arm/kernel/atags_compat.c index 5236ad38f417..05c28b12353c 100644 --- a/arch/arm/kernel/atags_compat.c +++ b/arch/arm/kernel/atags_compat.c @@ -97,8 +97,7 @@ static void __init build_tag_list(struct param_struct *params, void *taglist) struct tag *tag = taglist; if (params->u1.s.page_size != PAGE_SIZE) { - printk(KERN_WARNING "Warning: bad configuration page, " - "trying to continue\n"); + pr_warn("Warning: bad configuration page, trying to continue\n"); return; } @@ -109,8 +108,7 @@ static void __init build_tag_list(struct param_struct *params, void *taglist) params->u1.s.nr_pages != 0x04000 && params->u1.s.nr_pages != 0x08000 && params->u1.s.nr_pages != 0x10000) { - printk(KERN_WARNING "Warning: bad NeTTrom parameters " - "detected, using defaults\n"); + pr_warn("Warning: bad NeTTrom parameters detected, using defaults\n"); params->u1.s.nr_pages = 0x1000; /* 16MB */ params->u1.s.ramdisk_size = 0; diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c index 528f8af2addb..68c6ae0b9e4c 100644 --- a/arch/arm/kernel/atags_parse.c +++ b/arch/arm/kernel/atags_parse.c @@ -167,8 +167,7 @@ static void __init parse_tags(const struct tag *t) { for (; t->hdr.size; t = tag_next(t)) if (!parse_tag(t)) - printk(KERN_WARNING - "Ignoring unrecognised tag 0x%08x\n", + pr_warn("Ignoring unrecognised tag 0x%08x\n", t->hdr.tag); } @@ -193,7 +192,7 @@ setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr) */ for_each_machine_desc(p) if (machine_nr == p->nr) { - printk("Machine: %s\n", p->name); + pr_info("Machine: %s\n", p->name); mdesc = p; break; } diff --git a/arch/arm/kernel/atags_proc.c b/arch/arm/kernel/atags_proc.c index c7ff8073416f..5a3379055f55 100644 --- a/arch/arm/kernel/atags_proc.c +++ b/arch/arm/kernel/atags_proc.c @@ -41,7 +41,7 @@ static int __init init_atags_procfs(void) size_t size; if (tag->hdr.tag != ATAG_CORE) { - printk(KERN_INFO "No ATAGs?"); + pr_info("No ATAGs?"); return -EINVAL; } @@ -68,7 +68,7 @@ static int __init init_atags_procfs(void) nomem: kfree(b); - printk(KERN_ERR "Exporting ATAGs: not enough memory\n"); + pr_err("Exporting ATAGs: not enough memory\n"); return -ENOMEM; } diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index daaff73bc776..a4effd6d8f2f 100644 --- a/arch/arm/kernel/bios32.c +++ b/arch/arm/kernel/bios32.c @@ -364,7 +364,7 @@ void pcibios_fixup_bus(struct pci_bus *bus) /* * Report what we did for this bus */ - printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n", + pr_info("PCI: bus%d: Fast back to back transfers %sabled\n", bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis"); } EXPORT_SYMBOL(pcibios_fixup_bus); diff --git a/arch/arm/kernel/dma-isa.c b/arch/arm/kernel/dma-isa.c index 360bb6d701f5..84363fe7bad2 100644 --- a/arch/arm/kernel/dma-isa.c +++ b/arch/arm/kernel/dma-isa.c @@ -213,8 +213,8 @@ void __init isa_init_dma(void) for (chan = 0; chan < 8; chan++) { int ret = isa_dma_add(chan, &isa_dma[chan]); if (ret) - printk(KERN_ERR "ISADMA%u: unable to register: %d\n", - chan, ret); + pr_err("ISADMA%u: unable to register: %d\n", + chan, ret); } request_dma(DMA_ISA_CASCADE, "cascade"); diff --git a/arch/arm/kernel/dma.c b/arch/arm/kernel/dma.c index 7b829d9663b1..e651c4d0a0d9 100644 --- a/arch/arm/kernel/dma.c +++ b/arch/arm/kernel/dma.c @@ -79,7 +79,7 @@ int request_dma(unsigned int chan, const char *device_id) return ret; bad_dma: - printk(KERN_ERR "dma: trying to allocate DMA%d\n", chan); + pr_err("dma: trying to allocate DMA%d\n", chan); return -EINVAL; busy: @@ -100,7 +100,7 @@ void free_dma(unsigned int chan) goto bad_dma; if (dma->active) { - printk(KERN_ERR "dma%d: freeing active DMA\n", chan); + pr_err("dma%d: freeing active DMA\n", chan); dma->d_ops->disable(chan, dma); dma->active = 0; } @@ -111,11 +111,11 @@ void free_dma(unsigned int chan) return; } - printk(KERN_ERR "dma%d: trying to free free DMA\n", chan); + pr_err("dma%d: trying to free free DMA\n", chan); return; bad_dma: - printk(KERN_ERR "dma: trying to free DMA%d\n", chan); + pr_err("dma: trying to free DMA%d\n", chan); } EXPORT_SYMBOL(free_dma); @@ -126,8 +126,7 @@ void set_dma_sg (unsigned int chan, struct scatterlist *sg, int nr_sg) dma_t *dma = dma_channel(chan); if (dma->active) - printk(KERN_ERR "dma%d: altering DMA SG while " - "DMA active\n", chan); + pr_err("dma%d: altering DMA SG while DMA active\n", chan); dma->sg = sg; dma->sgcount = nr_sg; @@ -144,8 +143,7 @@ void __set_dma_addr (unsigned int chan, void *addr) dma_t *dma = dma_channel(chan); if (dma->active) - printk(KERN_ERR "dma%d: altering DMA address while " - "DMA active\n", chan); + pr_err("dma%d: altering DMA address while DMA active\n", chan); dma->sg = NULL; dma->addr = addr; @@ -162,8 +160,7 @@ void set_dma_count (unsigned int chan, unsigned long count) dma_t *dma = dma_channel(chan); if (dma->active) - printk(KERN_ERR "dma%d: altering DMA count while " - "DMA active\n", chan); + pr_err("dma%d: altering DMA count while DMA active\n", chan); dma->sg = NULL; dma->count = count; @@ -178,8 +175,7 @@ void set_dma_mode (unsigned int chan, unsigned int mode) dma_t *dma = dma_channel(chan); if (dma->active) - printk(KERN_ERR "dma%d: altering DMA mode while " - "DMA active\n", chan); + pr_err("dma%d: altering DMA mode while DMA active\n", chan); dma->dma_mode = mode; dma->invalid = 1; @@ -202,7 +198,7 @@ void enable_dma (unsigned int chan) return; free_dma: - printk(KERN_ERR "dma%d: trying to enable free DMA\n", chan); + pr_err("dma%d: trying to enable free DMA\n", chan); BUG(); } EXPORT_SYMBOL(enable_dma); @@ -223,7 +219,7 @@ void disable_dma (unsigned int chan) return; free_dma: - printk(KERN_ERR "dma%d: trying to disable free DMA\n", chan); + pr_err("dma%d: trying to disable free DMA\n", chan); BUG(); } EXPORT_SYMBOL(disable_dma); @@ -240,7 +236,7 @@ EXPORT_SYMBOL(dma_channel_active); void set_dma_page(unsigned int chan, char pagenr) { - printk(KERN_ERR "dma%d: trying to set_dma_page\n", chan); + pr_err("dma%d: trying to set_dma_page\n", chan); } EXPORT_SYMBOL(set_dma_page); diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 6bb09d4abdea..f8ccc21fa032 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -109,241 +109,6 @@ ENDPROC(ret_from_fork) #undef CALL #define CALL(x) .long x -#ifdef CONFIG_FUNCTION_TRACER -/* - * When compiling with -pg, gcc inserts a call to the mcount routine at the - * start of every function. In mcount, apart from the function's address (in - * lr), we need to get hold of the function's caller's address. - * - * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: - * - * bl mcount - * - * These versions have the limitation that in order for the mcount routine to - * be able to determine the function's caller's address, an APCS-style frame - * pointer (which is set up with something like the code below) is required. - * - * mov ip, sp - * push {fp, ip, lr, pc} - * sub fp, ip, #4 - * - * With EABI, these frame pointers are not available unless -mapcs-frame is - * specified, and if building as Thumb-2, not even then. - * - * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, - * with call sites like: - * - * push {lr} - * bl __gnu_mcount_nc - * - * With these compilers, frame pointers are not necessary. - * - * mcount can be thought of as a function called in the middle of a subroutine - * call. As such, it needs to be transparent for both the caller and the - * callee: the original lr needs to be restored when leaving mcount, and no - * registers should be clobbered. (In the __gnu_mcount_nc implementation, we - * clobber the ip register. This is OK because the ARM calling convention - * allows it to be clobbered in subroutines and doesn't use it to hold - * parameters.) - * - * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0" - * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see - * arch/arm/kernel/ftrace.c). - */ - -#ifndef CONFIG_OLD_MCOUNT -#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) -#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. -#endif -#endif - -.macro mcount_adjust_addr rd, rn - bic \rd, \rn, #1 @ clear the Thumb bit if present - sub \rd, \rd, #MCOUNT_INSN_SIZE -.endm - -.macro __mcount suffix - mcount_enter - ldr r0, =ftrace_trace_function - ldr r2, [r0] - adr r0, .Lftrace_stub - cmp r0, r2 - bne 1f - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER - ldr r1, =ftrace_graph_return - ldr r2, [r1] - cmp r0, r2 - bne ftrace_graph_caller\suffix - - ldr r1, =ftrace_graph_entry - ldr r2, [r1] - ldr r0, =ftrace_graph_entry_stub - cmp r0, r2 - bne ftrace_graph_caller\suffix -#endif - - mcount_exit - -1: mcount_get_lr r1 @ lr of instrumented func - mcount_adjust_addr r0, lr @ instrumented function - adr lr, BSYM(2f) - mov pc, r2 -2: mcount_exit -.endm - -.macro __ftrace_caller suffix - mcount_enter - - mcount_get_lr r1 @ lr of instrumented func - mcount_adjust_addr r0, lr @ instrumented function - - .globl ftrace_call\suffix -ftrace_call\suffix: - bl ftrace_stub - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER - .globl ftrace_graph_call\suffix -ftrace_graph_call\suffix: - mov r0, r0 -#endif - - mcount_exit -.endm - -.macro __ftrace_graph_caller - sub r0, fp, #4 @ &lr of instrumented routine (&parent) -#ifdef CONFIG_DYNAMIC_FTRACE - @ called from __ftrace_caller, saved in mcount_enter - ldr r1, [sp, #16] @ instrumented routine (func) - mcount_adjust_addr r1, r1 -#else - @ called from __mcount, untouched in lr - mcount_adjust_addr r1, lr @ instrumented routine (func) -#endif - mov r2, fp @ frame pointer - bl prepare_ftrace_return - mcount_exit -.endm - -#ifdef CONFIG_OLD_MCOUNT -/* - * mcount - */ - -.macro mcount_enter - stmdb sp!, {r0-r3, lr} -.endm - -.macro mcount_get_lr reg - ldr \reg, [fp, #-4] -.endm - -.macro mcount_exit - ldr lr, [fp, #-4] - ldmia sp!, {r0-r3, pc} -.endm - -ENTRY(mcount) -#ifdef CONFIG_DYNAMIC_FTRACE - stmdb sp!, {lr} - ldr lr, [fp, #-4] - ldmia sp!, {pc} -#else - __mcount _old -#endif -ENDPROC(mcount) - -#ifdef CONFIG_DYNAMIC_FTRACE -ENTRY(ftrace_caller_old) - __ftrace_caller _old -ENDPROC(ftrace_caller_old) -#endif - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -ENTRY(ftrace_graph_caller_old) - __ftrace_graph_caller -ENDPROC(ftrace_graph_caller_old) -#endif - -.purgem mcount_enter -.purgem mcount_get_lr -.purgem mcount_exit -#endif - -/* - * __gnu_mcount_nc - */ - -.macro mcount_enter -/* - * This pad compensates for the push {lr} at the call site. Note that we are - * unable to unwind through a function which does not otherwise save its lr. - */ - UNWIND(.pad #4) - stmdb sp!, {r0-r3, lr} - UNWIND(.save {r0-r3, lr}) -.endm - -.macro mcount_get_lr reg - ldr \reg, [sp, #20] -.endm - -.macro mcount_exit - ldmia sp!, {r0-r3, ip, lr} - ret ip -.endm - -ENTRY(__gnu_mcount_nc) -UNWIND(.fnstart) -#ifdef CONFIG_DYNAMIC_FTRACE - mov ip, lr - ldmia sp!, {lr} - ret ip -#else - __mcount -#endif -UNWIND(.fnend) -ENDPROC(__gnu_mcount_nc) - -#ifdef CONFIG_DYNAMIC_FTRACE -ENTRY(ftrace_caller) -UNWIND(.fnstart) - __ftrace_caller -UNWIND(.fnend) -ENDPROC(ftrace_caller) -#endif - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -ENTRY(ftrace_graph_caller) -UNWIND(.fnstart) - __ftrace_graph_caller -UNWIND(.fnend) -ENDPROC(ftrace_graph_caller) -#endif - -.purgem mcount_enter -.purgem mcount_get_lr -.purgem mcount_exit - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER - .globl return_to_handler -return_to_handler: - stmdb sp!, {r0-r3} - mov r0, fp @ frame pointer - bl ftrace_return_to_handler - mov lr, r0 @ r0 has real ret addr - ldmia sp!, {r0-r3} - ret lr -#endif - -ENTRY(ftrace_stub) -.Lftrace_stub: - ret lr -ENDPROC(ftrace_stub) - -#endif /* CONFIG_FUNCTION_TRACER */ - /*============================================================================= * SWI handler *----------------------------------------------------------------------------- diff --git a/arch/arm/kernel/entry-ftrace.S b/arch/arm/kernel/entry-ftrace.S new file mode 100644 index 000000000000..fe57c73e70a4 --- /dev/null +++ b/arch/arm/kernel/entry-ftrace.S @@ -0,0 +1,243 @@ +/* + * 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. + */ + +#include <asm/assembler.h> +#include <asm/ftrace.h> +#include <asm/unwind.h> + +#include "entry-header.S" + +/* + * When compiling with -pg, gcc inserts a call to the mcount routine at the + * start of every function. In mcount, apart from the function's address (in + * lr), we need to get hold of the function's caller's address. + * + * Older GCCs (pre-4.4) inserted a call to a routine called mcount like this: + * + * bl mcount + * + * These versions have the limitation that in order for the mcount routine to + * be able to determine the function's caller's address, an APCS-style frame + * pointer (which is set up with something like the code below) is required. + * + * mov ip, sp + * push {fp, ip, lr, pc} + * sub fp, ip, #4 + * + * With EABI, these frame pointers are not available unless -mapcs-frame is + * specified, and if building as Thumb-2, not even then. + * + * Newer GCCs (4.4+) solve this problem by introducing a new version of mcount, + * with call sites like: + * + * push {lr} + * bl __gnu_mcount_nc + * + * With these compilers, frame pointers are not necessary. + * + * mcount can be thought of as a function called in the middle of a subroutine + * call. As such, it needs to be transparent for both the caller and the + * callee: the original lr needs to be restored when leaving mcount, and no + * registers should be clobbered. (In the __gnu_mcount_nc implementation, we + * clobber the ip register. This is OK because the ARM calling convention + * allows it to be clobbered in subroutines and doesn't use it to hold + * parameters.) + * + * When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0" + * for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see + * arch/arm/kernel/ftrace.c). + */ + +#ifndef CONFIG_OLD_MCOUNT +#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)) +#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0. +#endif +#endif + +.macro mcount_adjust_addr rd, rn + bic \rd, \rn, #1 @ clear the Thumb bit if present + sub \rd, \rd, #MCOUNT_INSN_SIZE +.endm + +.macro __mcount suffix + mcount_enter + ldr r0, =ftrace_trace_function + ldr r2, [r0] + adr r0, .Lftrace_stub + cmp r0, r2 + bne 1f + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + ldr r1, =ftrace_graph_return + ldr r2, [r1] + cmp r0, r2 + bne ftrace_graph_caller\suffix + + ldr r1, =ftrace_graph_entry + ldr r2, [r1] + ldr r0, =ftrace_graph_entry_stub + cmp r0, r2 + bne ftrace_graph_caller\suffix +#endif + + mcount_exit + +1: mcount_get_lr r1 @ lr of instrumented func + mcount_adjust_addr r0, lr @ instrumented function + adr lr, BSYM(2f) + mov pc, r2 +2: mcount_exit +.endm + +.macro __ftrace_caller suffix + mcount_enter + + mcount_get_lr r1 @ lr of instrumented func + mcount_adjust_addr r0, lr @ instrumented function + + .globl ftrace_call\suffix +ftrace_call\suffix: + bl ftrace_stub + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + .globl ftrace_graph_call\suffix +ftrace_graph_call\suffix: + mov r0, r0 +#endif + + mcount_exit +.endm + +.macro __ftrace_graph_caller + sub r0, fp, #4 @ &lr of instrumented routine (&parent) +#ifdef CONFIG_DYNAMIC_FTRACE + @ called from __ftrace_caller, saved in mcount_enter + ldr r1, [sp, #16] @ instrumented routine (func) + mcount_adjust_addr r1, r1 +#else + @ called from __mcount, untouched in lr + mcount_adjust_addr r1, lr @ instrumented routine (func) +#endif + mov r2, fp @ frame pointer + bl prepare_ftrace_return + mcount_exit +.endm + +#ifdef CONFIG_OLD_MCOUNT +/* + * mcount + */ + +.macro mcount_enter + stmdb sp!, {r0-r3, lr} +.endm + +.macro mcount_get_lr reg + ldr \reg, [fp, #-4] +.endm + +.macro mcount_exit + ldr lr, [fp, #-4] + ldmia sp!, {r0-r3, pc} +.endm + +ENTRY(mcount) +#ifdef CONFIG_DYNAMIC_FTRACE + stmdb sp!, {lr} + ldr lr, [fp, #-4] + ldmia sp!, {pc} +#else + __mcount _old +#endif +ENDPROC(mcount) + +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(ftrace_caller_old) + __ftrace_caller _old +ENDPROC(ftrace_caller_old) +#endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(ftrace_graph_caller_old) + __ftrace_graph_caller +ENDPROC(ftrace_graph_caller_old) +#endif + +.purgem mcount_enter +.purgem mcount_get_lr +.purgem mcount_exit +#endif + +/* + * __gnu_mcount_nc + */ + +.macro mcount_enter +/* + * This pad compensates for the push {lr} at the call site. Note that we are + * unable to unwind through a function which does not otherwise save its lr. + */ + UNWIND(.pad #4) + stmdb sp!, {r0-r3, lr} + UNWIND(.save {r0-r3, lr}) +.endm + +.macro mcount_get_lr reg + ldr \reg, [sp, #20] +.endm + +.macro mcount_exit + ldmia sp!, {r0-r3, ip, lr} + ret ip +.endm + +ENTRY(__gnu_mcount_nc) +UNWIND(.fnstart) +#ifdef CONFIG_DYNAMIC_FTRACE + mov ip, lr + ldmia sp!, {lr} + ret ip +#else + __mcount +#endif +UNWIND(.fnend) +ENDPROC(__gnu_mcount_nc) + +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(ftrace_caller) +UNWIND(.fnstart) + __ftrace_caller +UNWIND(.fnend) +ENDPROC(ftrace_caller) +#endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(ftrace_graph_caller) +UNWIND(.fnstart) + __ftrace_graph_caller +UNWIND(.fnend) +ENDPROC(ftrace_graph_caller) +#endif + +.purgem mcount_enter +.purgem mcount_get_lr +.purgem mcount_exit + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + .globl return_to_handler +return_to_handler: + stmdb sp!, {r0-r3} + mov r0, fp @ frame pointer + bl ftrace_return_to_handler + mov lr, r0 @ r0 has real ret addr + ldmia sp!, {r0-r3} + ret lr +#endif + +ENTRY(ftrace_stub) +.Lftrace_stub: + ret lr +ENDPROC(ftrace_stub) diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index 131a6ab5f355..8b96972dcb1d 100644 --- a/arch/arm/kernel/etm.c +++ b/arch/arm/kernel/etm.c @@ -213,7 +213,7 @@ static void etm_dump(void) int length; if (!t->etb_regs) { - printk(KERN_INFO "No tracing hardware found\n"); + pr_info("No tracing hardware found\n"); return; } @@ -229,11 +229,11 @@ static void etm_dump(void) etb_writel(t, first, ETBR_READADDR); - printk(KERN_INFO "Trace buffer contents length: %d\n", length); - printk(KERN_INFO "--- ETB buffer begin ---\n"); + pr_info("Trace buffer contents length: %d\n", length); + pr_info("--- ETB buffer begin ---\n"); for (; length; length--) printk("%08x", cpu_to_be32(etb_readl(t, ETBR_READMEM))); - printk(KERN_INFO "\n--- ETB buffer end ---\n"); + pr_info("\n--- ETB buffer end ---\n"); /* deassert the overflow bit */ etb_writel(t, 1, ETBR_CTRL); @@ -633,14 +633,14 @@ static int __init etm_init(void) retval = amba_driver_register(&etb_driver); if (retval) { - printk(KERN_ERR "Failed to register etb\n"); + pr_err("Failed to register etb\n"); return retval; } retval = amba_driver_register(&etm_driver); if (retval) { amba_driver_unregister(&etb_driver); - printk(KERN_ERR "Failed to probe etm\n"); + pr_err("Failed to probe etm\n"); return retval; } diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c index b37752a96652..059c3da0fee3 100644 --- a/arch/arm/kernel/fiq.c +++ b/arch/arm/kernel/fiq.c @@ -124,7 +124,7 @@ int claim_fiq(struct fiq_handler *f) void release_fiq(struct fiq_handler *f) { if (current_fiq != f) { - printk(KERN_ERR "%s FIQ trying to release %s FIQ\n", + pr_err("%s FIQ trying to release %s FIQ\n", f->name, current_fiq->name); dump_stack(); return; diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c index af9a8a927a4e..b8c75e45a950 100644 --- a/arch/arm/kernel/ftrace.c +++ b/arch/arm/kernel/ftrace.c @@ -15,6 +15,7 @@ #include <linux/ftrace.h> #include <linux/uaccess.h> #include <linux/module.h> +#include <linux/stop_machine.h> #include <asm/cacheflush.h> #include <asm/opcodes.h> @@ -35,6 +36,22 @@ #define OLD_NOP 0xe1a00000 /* mov r0, r0 */ +static int __ftrace_modify_code(void *data) +{ + int *command = data; + + set_kernel_text_rw(); + ftrace_modify_all_code(*command); + set_kernel_text_ro(); + + return 0; +} + +void arch_ftrace_update_code(int command) +{ + stop_machine(__ftrace_modify_code, &command, NULL); +} + static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec) { return rec->arch.old_mcount ? OLD_NOP : NOP; @@ -73,6 +90,8 @@ int ftrace_arch_code_modify_prepare(void) int ftrace_arch_code_modify_post_process(void) { set_all_modules_text_ro(); + /* Make sure any TLB misses during machine stop are cleared. */ + flush_tlb_all(); return 0; } diff --git a/arch/arm/kernel/io.c b/arch/arm/kernel/io.c index 9203cf883330..eedefe050022 100644 --- a/arch/arm/kernel/io.c +++ b/arch/arm/kernel/io.c @@ -51,6 +51,7 @@ void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count) from++; } } |