diff options
Diffstat (limited to 'arch/microblaze/kernel/mcount.S')
| -rw-r--r-- | arch/microblaze/kernel/mcount.S | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/mcount.S b/arch/microblaze/kernel/mcount.S new file mode 100644 index 00000000000..e7eaa7a8cbd --- /dev/null +++ b/arch/microblaze/kernel/mcount.S @@ -0,0 +1,170 @@ +/* + * Low-level ftrace handling + * + * Copyright (C) 2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2009 PetaLogix + * + * 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 <linux/linkage.h> + +#define NOALIGN_ENTRY(name) .globl name; name: + +/* FIXME MS: I think that I don't need to save all regs */ +#define SAVE_REGS \ + addik r1, r1, -120; \ + swi r2, r1, 4; \ + swi r3, r1, 8; \ + swi r4, r1, 12; \ + swi r5, r1, 116; \ + swi r6, r1, 16; \ + swi r7, r1, 20; \ + swi r8, r1, 24; \ + swi r9, r1, 28; \ + swi r10, r1, 32; \ + swi r11, r1, 36; \ + swi r12, r1, 40; \ + swi r13, r1, 44; \ + swi r14, r1, 48; \ + swi r16, r1, 52; \ + swi r17, r1, 56; \ + swi r18, r1, 60; \ + swi r19, r1, 64; \ + swi r20, r1, 68; \ + swi r21, r1, 72; \ + swi r22, r1, 76; \ + swi r23, r1, 80; \ + swi r24, r1, 84; \ + swi r25, r1, 88; \ + swi r26, r1, 92; \ + swi r27, r1, 96; \ + swi r28, r1, 100; \ + swi r29, r1, 104; \ + swi r30, r1, 108; \ + swi r31, r1, 112; + +#define RESTORE_REGS \ + lwi r2, r1, 4; \ + lwi r3, r1, 8; \ + lwi r4, r1, 12; \ + lwi r5, r1, 116; \ + lwi r6, r1, 16; \ + lwi r7, r1, 20; \ + lwi r8, r1, 24; \ + lwi r9, r1, 28; \ + lwi r10, r1, 32; \ + lwi r11, r1, 36; \ + lwi r12, r1, 40; \ + lwi r13, r1, 44; \ + lwi r14, r1, 48; \ + lwi r16, r1, 52; \ + lwi r17, r1, 56; \ + lwi r18, r1, 60; \ + lwi r19, r1, 64; \ + lwi r20, r1, 68; \ + lwi r21, r1, 72; \ + lwi r22, r1, 76; \ + lwi r23, r1, 80; \ + lwi r24, r1, 84; \ + lwi r25, r1, 88; \ + lwi r26, r1, 92; \ + lwi r27, r1, 96; \ + lwi r28, r1, 100; \ + lwi r29, r1, 104; \ + lwi r30, r1, 108; \ + lwi r31, r1, 112; \ + addik r1, r1, 120; + +ENTRY(ftrace_stub) + rtsd r15, 8; + nop; + +ENTRY(_mcount) +#ifdef CONFIG_DYNAMIC_FTRACE +ENTRY(ftrace_caller) + /* MS: It is just barrier which is removed from C code */ + rtsd r15, 8 + nop +#endif /* CONFIG_DYNAMIC_FTRACE */ + SAVE_REGS + swi r15, r1, 0; + /* MS: HAVE_FUNCTION_TRACE_MCOUNT_TEST begin of checking */ + lwi r5, r0, function_trace_stop; + bneid r5, end; + nop; + /* MS: HAVE_FUNCTION_TRACE_MCOUNT_TEST end of checking */ +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +#ifndef CONFIG_DYNAMIC_FTRACE + lwi r5, r0, ftrace_graph_return; + addik r6, r0, ftrace_stub; /* asm implementation */ + cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */ + beqid r5, end_graph_tracer; + nop; + + lwi r6, r0, ftrace_graph_entry; + addik r5, r0, ftrace_graph_entry_stub; /* implemented in C */ + cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */ + beqid r5, end_graph_tracer; + nop; +#else /* CONFIG_DYNAMIC_FTRACE */ +NOALIGN_ENTRY(ftrace_call_graph) + /* MS: jump over graph function - replaced from C code */ + bri end_graph_tracer +#endif /* CONFIG_DYNAMIC_FTRACE */ + addik r5, r1, 120; /* MS: load parent addr */ + addik r6, r15, 0; /* MS: load current function addr */ + bralid r15, prepare_ftrace_return; + nop; + /* MS: graph was taken that's why - can jump over function trace */ + brid end; + nop; +end_graph_tracer: +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ +#ifndef CONFIG_DYNAMIC_FTRACE + /* MS: test function trace if is taken or not */ + lwi r20, r0, ftrace_trace_function; + addik r6, r0, ftrace_stub; + cmpu r5, r20, r6; /* ftrace_trace_function != ftrace_stub */ + beqid r5, end; /* MS: not taken -> jump over */ + nop; +#else /* CONFIG_DYNAMIC_FTRACE */ +NOALIGN_ENTRY(ftrace_call) +/* instruction for setup imm FUNC_part1, addik r20, r0, FUNC_part2 */ + nop + nop +#endif /* CONFIG_DYNAMIC_FTRACE */ +/* static normal trace */ + lwi r6, r1, 120; /* MS: load parent addr */ + addik r5, r15, 0; /* MS: load current function addr */ + /* MS: here is dependency on previous code */ + brald r15, r20; /* MS: jump to ftrace handler */ + nop; +end: + lwi r15, r1, 0; + RESTORE_REGS + + rtsd r15, 8; /* MS: jump back */ + nop; + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(return_to_handler) + nop; /* MS: just barrier for rtsd r15, 8 */ + nop; + SAVE_REGS + swi r15, r1, 0; + + /* MS: find out returning address */ + bralid r15, ftrace_return_to_handler; + nop; + + /* MS: return value from ftrace_return_to_handler is my returning addr + * must be before restore regs because I have to restore r3 content */ + addik r15, r3, 0; + RESTORE_REGS + + rtsd r15, 8; /* MS: jump back */ + nop; +#endif /* CONFIG_FUNCTION_TRACER */ |