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126 lines
2.6 KiB
126 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com) |
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* |
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* This file implements mcount(), which is used to collect profiling data. |
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* This can also be tweaked for kernel stack overflow detection. |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/export.h> |
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/* |
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* This is the main variant and is called by C code. GCC's -pg option |
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* automatically instruments every C function with a call to this. |
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*/ |
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.text |
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.align 32 |
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.globl _mcount |
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.type _mcount,#function |
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EXPORT_SYMBOL(_mcount) |
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.globl mcount |
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.type mcount,#function |
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_mcount: |
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mcount: |
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#ifdef CONFIG_FUNCTION_TRACER |
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#ifdef CONFIG_DYNAMIC_FTRACE |
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/* Do nothing, the retl/nop below is all we need. */ |
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#else |
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sethi %hi(ftrace_trace_function), %g1 |
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sethi %hi(ftrace_stub), %g2 |
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ldx [%g1 + %lo(ftrace_trace_function)], %g1 |
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or %g2, %lo(ftrace_stub), %g2 |
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cmp %g1, %g2 |
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be,pn %icc, 1f |
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mov %i7, %g3 |
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save %sp, -176, %sp |
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mov %g3, %o1 |
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jmpl %g1, %o7 |
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mov %i7, %o0 |
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ret |
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restore |
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/* not reached */ |
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1: |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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sethi %hi(ftrace_graph_return), %g1 |
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ldx [%g1 + %lo(ftrace_graph_return)], %g3 |
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cmp %g2, %g3 |
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bne,pn %xcc, 5f |
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sethi %hi(ftrace_graph_entry_stub), %g2 |
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sethi %hi(ftrace_graph_entry), %g1 |
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or %g2, %lo(ftrace_graph_entry_stub), %g2 |
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ldx [%g1 + %lo(ftrace_graph_entry)], %g1 |
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cmp %g1, %g2 |
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be,pt %xcc, 2f |
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nop |
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5: mov %i7, %g2 |
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mov %fp, %g3 |
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save %sp, -176, %sp |
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mov %g2, %l0 |
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ba,pt %xcc, ftrace_graph_caller |
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mov %g3, %l1 |
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#endif |
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2: |
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#endif |
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#endif |
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retl |
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nop |
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.size _mcount,.-_mcount |
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.size mcount,.-mcount |
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#ifdef CONFIG_FUNCTION_TRACER |
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.globl ftrace_stub |
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.type ftrace_stub,#function |
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ftrace_stub: |
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retl |
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nop |
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.size ftrace_stub,.-ftrace_stub |
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#ifdef CONFIG_DYNAMIC_FTRACE |
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.globl ftrace_caller |
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.type ftrace_caller,#function |
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ftrace_caller: |
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mov %i7, %g2 |
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mov %fp, %g3 |
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save %sp, -176, %sp |
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mov %g2, %o1 |
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mov %g2, %l0 |
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mov %g3, %l1 |
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.globl ftrace_call |
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ftrace_call: |
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call ftrace_stub |
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mov %i7, %o0 |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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.globl ftrace_graph_call |
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ftrace_graph_call: |
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call ftrace_stub |
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nop |
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#endif |
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ret |
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restore |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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.size ftrace_graph_call,.-ftrace_graph_call |
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#endif |
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.size ftrace_call,.-ftrace_call |
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.size ftrace_caller,.-ftrace_caller |
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#endif |
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#endif |
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER |
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ENTRY(ftrace_graph_caller) |
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mov %l0, %o0 |
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mov %i7, %o1 |
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call prepare_ftrace_return |
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mov %l1, %o2 |
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ret |
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restore %o0, -8, %i7 |
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END(ftrace_graph_caller) |
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ENTRY(return_to_handler) |
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save %sp, -176, %sp |
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call ftrace_return_to_handler |
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mov %fp, %o0 |
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jmpl %o0 + 8, %g0 |
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restore |
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END(return_to_handler) |
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#endif
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