166 lines
4 KiB
ArmAsm
166 lines
4 KiB
ArmAsm
/*
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* Low-level ftrace handling
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*
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* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009 PetaLogix
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*/
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#include <linux/linkage.h>
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#define NOALIGN_ENTRY(name) .globl name; name:
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/* FIXME MS: I think that I don't need to save all regs */
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#define SAVE_REGS \
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addik r1, r1, -120; \
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swi r2, r1, 4; \
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swi r3, r1, 8; \
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swi r4, r1, 12; \
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swi r5, r1, 116; \
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swi r6, r1, 16; \
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swi r7, r1, 20; \
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swi r8, r1, 24; \
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swi r9, r1, 28; \
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swi r10, r1, 32; \
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swi r11, r1, 36; \
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swi r12, r1, 40; \
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swi r13, r1, 44; \
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swi r14, r1, 48; \
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swi r16, r1, 52; \
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swi r17, r1, 56; \
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swi r18, r1, 60; \
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swi r19, r1, 64; \
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swi r20, r1, 68; \
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swi r21, r1, 72; \
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swi r22, r1, 76; \
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swi r23, r1, 80; \
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swi r24, r1, 84; \
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swi r25, r1, 88; \
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swi r26, r1, 92; \
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swi r27, r1, 96; \
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swi r28, r1, 100; \
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swi r29, r1, 104; \
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swi r30, r1, 108; \
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swi r31, r1, 112;
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#define RESTORE_REGS \
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lwi r2, r1, 4; \
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lwi r3, r1, 8; \
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lwi r4, r1, 12; \
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lwi r5, r1, 116; \
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lwi r6, r1, 16; \
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lwi r7, r1, 20; \
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lwi r8, r1, 24; \
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lwi r9, r1, 28; \
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lwi r10, r1, 32; \
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lwi r11, r1, 36; \
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lwi r12, r1, 40; \
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lwi r13, r1, 44; \
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lwi r14, r1, 48; \
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lwi r16, r1, 52; \
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lwi r17, r1, 56; \
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lwi r18, r1, 60; \
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lwi r19, r1, 64; \
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lwi r20, r1, 68; \
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lwi r21, r1, 72; \
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lwi r22, r1, 76; \
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lwi r23, r1, 80; \
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lwi r24, r1, 84; \
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lwi r25, r1, 88; \
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lwi r26, r1, 92; \
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lwi r27, r1, 96; \
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lwi r28, r1, 100; \
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lwi r29, r1, 104; \
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lwi r30, r1, 108; \
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lwi r31, r1, 112; \
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addik r1, r1, 120;
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ENTRY(ftrace_stub)
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rtsd r15, 8;
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nop;
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ENTRY(_mcount)
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(ftrace_caller)
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/* MS: It is just barrier which is removed from C code */
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rtsd r15, 8
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nop
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#endif /* CONFIG_DYNAMIC_FTRACE */
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SAVE_REGS
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swi r15, r1, 0;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#ifndef CONFIG_DYNAMIC_FTRACE
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lwi r5, r0, ftrace_graph_return;
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addik r6, r0, ftrace_stub; /* asm implementation */
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cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */
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beqid r5, end_graph_tracer;
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nop;
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lwi r6, r0, ftrace_graph_entry;
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addik r5, r0, ftrace_graph_entry_stub; /* implemented in C */
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cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */
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beqid r5, end_graph_tracer;
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nop;
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#else /* CONFIG_DYNAMIC_FTRACE */
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NOALIGN_ENTRY(ftrace_call_graph)
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/* MS: jump over graph function - replaced from C code */
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bri end_graph_tracer
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#endif /* CONFIG_DYNAMIC_FTRACE */
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addik r5, r1, 120; /* MS: load parent addr */
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addik r6, r15, 0; /* MS: load current function addr */
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bralid r15, prepare_ftrace_return;
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nop;
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/* MS: graph was taken that's why - can jump over function trace */
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brid end;
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nop;
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end_graph_tracer:
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#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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#ifndef CONFIG_DYNAMIC_FTRACE
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/* MS: test function trace if is taken or not */
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lwi r20, r0, ftrace_trace_function;
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addik r6, r0, ftrace_stub;
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cmpu r5, r20, r6; /* ftrace_trace_function != ftrace_stub */
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beqid r5, end; /* MS: not taken -> jump over */
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nop;
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#else /* CONFIG_DYNAMIC_FTRACE */
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NOALIGN_ENTRY(ftrace_call)
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/* instruction for setup imm FUNC_part1, addik r20, r0, FUNC_part2 */
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nop
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nop
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#endif /* CONFIG_DYNAMIC_FTRACE */
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/* static normal trace */
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lwi r6, r1, 120; /* MS: load parent addr */
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addik r5, r15, -4; /* MS: load current function addr */
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/* MS: here is dependency on previous code */
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brald r15, r20; /* MS: jump to ftrace handler */
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nop;
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end:
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lwi r15, r1, 0;
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RESTORE_REGS
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rtsd r15, 8; /* MS: jump back */
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nop;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ENTRY(return_to_handler)
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nop; /* MS: just barrier for rtsd r15, 8 */
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nop;
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SAVE_REGS
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swi r15, r1, 0;
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/* MS: find out returning address */
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bralid r15, ftrace_return_to_handler;
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nop;
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/* MS: return value from ftrace_return_to_handler is my returning addr
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* must be before restore regs because I have to restore r3 content */
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addik r15, r3, 0;
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RESTORE_REGS
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rtsd r15, 8; /* MS: jump back */
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nop;
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#endif /* CONFIG_FUNCTION_TRACER */
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