diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/microblaze/kernel/ftrace.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/microblaze/kernel/ftrace.c | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/ANDROID_3.4.5/arch/microblaze/kernel/ftrace.c b/ANDROID_3.4.5/arch/microblaze/kernel/ftrace.c deleted file mode 100644 index 357d56ab..00000000 --- a/ANDROID_3.4.5/arch/microblaze/kernel/ftrace.c +++ /dev/null @@ -1,233 +0,0 @@ -/* - * Ftrace support for Microblaze. - * - * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> - * Copyright (C) 2009 PetaLogix - * - * Based on MIPS and PowerPC ftrace code - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <asm/cacheflush.h> -#include <linux/ftrace.h> - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -/* - * Hook the return address and push it in the stack of return addrs - * in current thread info. - */ -void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) -{ - unsigned long old; - int faulted, err; - struct ftrace_graph_ent trace; - unsigned long return_hooker = (unsigned long) - &return_to_handler; - - if (unlikely(atomic_read(¤t->tracing_graph_pause))) - return; - - /* - * Protect against fault, even if it shouldn't - * happen. This tool is too much intrusive to - * ignore such a protection. - */ - asm volatile(" 1: lwi %0, %2, 0; \ - 2: swi %3, %2, 0; \ - addik %1, r0, 0; \ - 3: \ - .section .fixup, \"ax\"; \ - 4: brid 3b; \ - addik %1, r0, 1; \ - .previous; \ - .section __ex_table,\"a\"; \ - .word 1b,4b; \ - .word 2b,4b; \ - .previous;" \ - : "=&r" (old), "=r" (faulted) - : "r" (parent), "r" (return_hooker) - ); - - flush_dcache_range((u32)parent, (u32)parent + 4); - flush_icache_range((u32)parent, (u32)parent + 4); - - if (unlikely(faulted)) { - ftrace_graph_stop(); - WARN_ON(1); - return; - } - - err = ftrace_push_return_trace(old, self_addr, &trace.depth, 0); - if (err == -EBUSY) { - *parent = old; - return; - } - - trace.func = self_addr; - /* Only trace if the calling function expects to */ - if (!ftrace_graph_entry(&trace)) { - current->curr_ret_stack--; - *parent = old; - } -} -#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ - -#ifdef CONFIG_DYNAMIC_FTRACE -/* save value to addr - it is save to do it in asm */ -static int ftrace_modify_code(unsigned long addr, unsigned int value) -{ - int faulted = 0; - - __asm__ __volatile__(" 1: swi %2, %1, 0; \ - addik %0, r0, 0; \ - 2: \ - .section .fixup, \"ax\"; \ - 3: brid 2b; \ - addik %0, r0, 1; \ - .previous; \ - .section __ex_table,\"a\"; \ - .word 1b,3b; \ - .previous;" \ - : "=r" (faulted) - : "r" (addr), "r" (value) - ); - - if (unlikely(faulted)) - return -EFAULT; - - flush_dcache_range(addr, addr + 4); - flush_icache_range(addr, addr + 4); - - return 0; -} - -#define MICROBLAZE_NOP 0x80000000 -#define MICROBLAZE_BRI 0xb800000C - -static unsigned int recorded; /* if save was or not */ -static unsigned int imm; /* saving whole imm instruction */ - -/* There are two approaches howto solve ftrace_make nop function - look below */ -#undef USE_FTRACE_NOP - -#ifdef USE_FTRACE_NOP -static unsigned int bralid; /* saving whole bralid instruction */ -#endif - -int ftrace_make_nop(struct module *mod, - struct dyn_ftrace *rec, unsigned long addr) -{ - /* we have this part of code which we are working with - * b000c000 imm -16384 - * b9fc8e30 bralid r15, -29136 // c0008e30 <_mcount> - * 80000000 or r0, r0, r0 - * - * The first solution (!USE_FTRACE_NOP-could be called branch solution) - * b000c000 bri 12 (0xC - jump to any other instruction) - * b9fc8e30 bralid r15, -29136 // c0008e30 <_mcount> - * 80000000 or r0, r0, r0 - * any other instruction - * - * The second solution (USE_FTRACE_NOP) - no jump just nops - * 80000000 or r0, r0, r0 - * 80000000 or r0, r0, r0 - * 80000000 or r0, r0, r0 - */ - int ret = 0; - - if (recorded == 0) { - recorded = 1; - imm = *(unsigned int *)rec->ip; - pr_debug("%s: imm:0x%x\n", __func__, imm); -#ifdef USE_FTRACE_NOP - bralid = *(unsigned int *)(rec->ip + 4); - pr_debug("%s: bralid 0x%x\n", __func__, bralid); -#endif /* USE_FTRACE_NOP */ - } - -#ifdef USE_FTRACE_NOP - ret = ftrace_modify_code(rec->ip, MICROBLAZE_NOP); - ret += ftrace_modify_code(rec->ip + 4, MICROBLAZE_NOP); -#else /* USE_FTRACE_NOP */ - ret = ftrace_modify_code(rec->ip, MICROBLAZE_BRI); -#endif /* USE_FTRACE_NOP */ - return ret; -} - -/* I believe that first is called ftrace_make_nop before this function */ -int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) -{ - int ret; - pr_debug("%s: addr:0x%x, rec->ip: 0x%x, imm:0x%x\n", - __func__, (unsigned int)addr, (unsigned int)rec->ip, imm); - ret = ftrace_modify_code(rec->ip, imm); -#ifdef USE_FTRACE_NOP - pr_debug("%s: bralid:0x%x\n", __func__, bralid); - ret += ftrace_modify_code(rec->ip + 4, bralid); -#endif /* USE_FTRACE_NOP */ - return ret; -} - -int __init ftrace_dyn_arch_init(void *data) -{ - /* The return code is retured via data */ - *(unsigned long *)data = 0; - - return 0; -} - -int ftrace_update_ftrace_func(ftrace_func_t func) -{ - unsigned long ip = (unsigned long)(&ftrace_call); - unsigned int upper = (unsigned int)func; - unsigned int lower = (unsigned int)func; - int ret = 0; - - /* create proper saving to ftrace_call poll */ - upper = 0xb0000000 + (upper >> 16); /* imm func_upper */ - lower = 0x32800000 + (lower & 0xFFFF); /* addik r20, r0, func_lower */ - - pr_debug("%s: func=0x%x, ip=0x%x, upper=0x%x, lower=0x%x\n", - __func__, (unsigned int)func, (unsigned int)ip, upper, lower); - - /* save upper and lower code */ - ret = ftrace_modify_code(ip, upper); - ret += ftrace_modify_code(ip + 4, lower); - - /* We just need to replace the rtsd r15, 8 with NOP */ - ret += ftrace_modify_code((unsigned long)&ftrace_caller, - MICROBLAZE_NOP); - - return ret; -} - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -unsigned int old_jump; /* saving place for jump instruction */ - -int ftrace_enable_ftrace_graph_caller(void) -{ - unsigned int ret; - unsigned long ip = (unsigned long)(&ftrace_call_graph); - - old_jump = *(unsigned int *)ip; /* save jump over instruction */ - ret = ftrace_modify_code(ip, MICROBLAZE_NOP); - - pr_debug("%s: Replace instruction: 0x%x\n", __func__, old_jump); - return ret; -} - -int ftrace_disable_ftrace_graph_caller(void) -{ - unsigned int ret; - unsigned long ip = (unsigned long)(&ftrace_call_graph); - - ret = ftrace_modify_code(ip, old_jump); - - pr_debug("%s\n", __func__); - return ret; -} -#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ -#endif /* CONFIG_DYNAMIC_FTRACE */ |