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Diffstat (limited to 'arch/blackfin/kernel/ftrace-entry.S')
| -rw-r--r-- | arch/blackfin/kernel/ftrace-entry.S | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S deleted file mode 100644 index 3b8bdcbb7da3..000000000000 --- a/arch/blackfin/kernel/ftrace-entry.S +++ /dev/null @@ -1,207 +0,0 @@ -/* - * mcount and friends -- ftrace stuff - * - * Copyright (C) 2009-2010 Analog Devices Inc. - * Licensed under the GPL-2 or later. - */ - -#include <linux/linkage.h> -#include <asm/ftrace.h> - -.text - -#ifdef CONFIG_DYNAMIC_FTRACE - -/* Simple stub so we can boot the kernel until runtime patching has - * disabled all calls to this. Then it'll be unused. - */ -ENTRY(__mcount) -# if ANOMALY_05000371 - nop; nop; nop; nop; -# endif - rts; -ENDPROC(__mcount) - -/* GCC will have called us before setting up the function prologue, so we - * can clobber the normal scratch registers, but we need to make sure to - * save/restore the registers used for argument passing (R0-R2) in case - * the profiled function is using them. With data registers, R3 is the - * only one we can blow away. With pointer registers, we have P0-P2. - * - * Upon entry, the RETS will point to the top of the current profiled - * function. And since GCC pushed the previous RETS for us, the previous - * function will be waiting there. mmmm pie. - */ -ENTRY(_ftrace_caller) - /* save first/second/third function arg and the return register */ - [--sp] = r2; - [--sp] = r0; - [--sp] = r1; - [--sp] = rets; - - /* function_trace_call(unsigned long ip, unsigned long parent_ip): - * ip: this point was called by ... - * parent_ip: ... this function - * the ip itself will need adjusting for the mcount call - */ - r0 = rets; - r1 = [sp + 16]; /* skip the 4 local regs on stack */ - r0 += -MCOUNT_INSN_SIZE; - -.globl _ftrace_call -_ftrace_call: - call _ftrace_stub - -# ifdef CONFIG_FUNCTION_GRAPH_TRACER -.globl _ftrace_graph_call -_ftrace_graph_call: - nop; /* jump _ftrace_graph_caller; */ -# endif - - /* restore state and get out of dodge */ -.Lfinish_trace: - rets = [sp++]; - r1 = [sp++]; - r0 = [sp++]; - r2 = [sp++]; - -.globl _ftrace_stub -_ftrace_stub: - rts; -ENDPROC(_ftrace_caller) - -#else - -/* See documentation for _ftrace_caller */ -ENTRY(__mcount) - /* save third function arg early so we can do testing below */ - [--sp] = r2; - - /* load the function pointer to the tracer */ - p0.l = _ftrace_trace_function; - p0.h = _ftrace_trace_function; - r3 = [p0]; - - /* optional micro optimization: don't call the stub tracer */ - r2.l = _ftrace_stub; - r2.h = _ftrace_stub; - cc = r2 == r3; - if ! cc jump .Ldo_trace; - -# ifdef CONFIG_FUNCTION_GRAPH_TRACER - /* if the ftrace_graph_return function pointer is not set to - * the ftrace_stub entry, call prepare_ftrace_return(). - */ - p0.l = _ftrace_graph_return; - p0.h = _ftrace_graph_return; - r3 = [p0]; - cc = r2 == r3; - if ! cc jump _ftrace_graph_caller; - - /* similarly, if the ftrace_graph_entry function pointer is not - * set to the ftrace_graph_entry_stub entry, ... - */ - p0.l = _ftrace_graph_entry; - p0.h = _ftrace_graph_entry; - r2.l = _ftrace_graph_entry_stub; - r2.h = _ftrace_graph_entry_stub; - r3 = [p0]; - cc = r2 == r3; - if ! cc jump _ftrace_graph_caller; -# endif - - r2 = [sp++]; - rts; - -.Ldo_trace: - - /* save first/second function arg and the return register */ - [--sp] = r0; - [--sp] = r1; - [--sp] = rets; - - /* setup the tracer function */ - p0 = r3; - - /* function_trace_call(unsigned long ip, unsigned long parent_ip): - * ip: this point was called by ... - * parent_ip: ... this function - * the ip itself will need adjusting for the mcount call - */ - r0 = rets; - r1 = [sp + 16]; /* skip the 4 local regs on stack */ - r0 += -MCOUNT_INSN_SIZE; - - /* call the tracer */ - call (p0); - - /* restore state and get out of dodge */ -.Lfinish_trace: - rets = [sp++]; - r1 = [sp++]; - r0 = [sp++]; - r2 = [sp++]; - -.globl _ftrace_stub -_ftrace_stub: - rts; -ENDPROC(__mcount) - -#endif - -#ifdef CONFIG_FUNCTION_GRAPH_TRACER -/* The prepare_ftrace_return() function is similar to the trace function - * except it takes a pointer to the location of the frompc. This is so - * the prepare_ftrace_return() can hijack it temporarily for probing - * purposes. - */ -ENTRY(_ftrace_graph_caller) -# ifndef CONFIG_DYNAMIC_FTRACE - /* save first/second function arg and the return register */ - [--sp] = r0; - [--sp] = r1; - [--sp] = rets; - - /* prepare_ftrace_return(parent, self_addr, frame_pointer) */ - r0 = sp; /* unsigned long *parent */ - r1 = rets; /* unsigned long self_addr */ -# else - r0 = sp; /* unsigned long *parent */ - r1 = [sp]; /* unsigned long self_addr */ -# endif -# ifdef HAVE_FUNCTION_GRAPH_FP_TEST - r2 = fp; /* unsigned long frame_pointer */ -# endif - r0 += 16; /* skip the 4 local regs on stack */ - r1 += -MCOUNT_INSN_SIZE; - call _prepare_ftrace_return; - - jump .Lfinish_trace; -ENDPROC(_ftrace_graph_caller) - -/* Undo the rewrite caused by ftrace_graph_caller(). The common function - * ftrace_return_to_handler() will return the original rets so we can - * restore it and be on our way. - */ -ENTRY(_return_to_handler) - /* make sure original return values are saved */ - [--sp] = p0; - [--sp] = r0; - [--sp] = r1; - - /* get original return address */ -# ifdef HAVE_FUNCTION_GRAPH_FP_TEST - r0 = fp; /* Blackfin is sane, so omit this */ -# endif - call _ftrace_return_to_handler; - rets = r0; - - /* anomaly 05000371 - make sure we have at least three instructions - * between rets setting and the return - */ - r1 = [sp++]; - r0 = [sp++]; - p0 = [sp++]; - rts; -ENDPROC(_return_to_handler) -#endif |