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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
| commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
| tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/sparc/lib/mcount.S | |
| parent | Initial commit. (diff) | |
| download | linux-upstream/4.19.249.tar.xz linux-upstream/4.19.249.zip | |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/sparc/lib/mcount.S')
| -rw-r--r-- | arch/sparc/lib/mcount.S | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S new file mode 100644 index 000000000..deba6fa0b --- /dev/null +++ b/arch/sparc/lib/mcount.S @@ -0,0 +1,126 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com) + * + * This file implements mcount(), which is used to collect profiling data. + * This can also be tweaked for kernel stack overflow detection. + */ + +#include <linux/linkage.h> +#include <asm/export.h> + +/* + * This is the main variant and is called by C code. GCC's -pg option + * automatically instruments every C function with a call to this. + */ + + .text + .align 32 + .globl _mcount + .type _mcount,#function + EXPORT_SYMBOL(_mcount) + .globl mcount + .type mcount,#function +_mcount: +mcount: +#ifdef CONFIG_FUNCTION_TRACER +#ifdef CONFIG_DYNAMIC_FTRACE + /* Do nothing, the retl/nop below is all we need. */ +#else + sethi %hi(ftrace_trace_function), %g1 + sethi %hi(ftrace_stub), %g2 + ldx [%g1 + %lo(ftrace_trace_function)], %g1 + or %g2, %lo(ftrace_stub), %g2 + cmp %g1, %g2 + be,pn %icc, 1f + mov %i7, %g3 + save %sp, -176, %sp + mov %g3, %o1 + jmpl %g1, %o7 + mov %i7, %o0 + ret + restore + /* not reached */ +1: +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + sethi %hi(ftrace_graph_return), %g1 + ldx [%g1 + %lo(ftrace_graph_return)], %g3 + cmp %g2, %g3 + bne,pn %xcc, 5f + sethi %hi(ftrace_graph_entry_stub), %g2 + sethi %hi(ftrace_graph_entry), %g1 + or %g2, %lo(ftrace_graph_entry_stub), %g2 + ldx [%g1 + %lo(ftrace_graph_entry)], %g1 + cmp %g1, %g2 + be,pt %xcc, 2f + nop +5: mov %i7, %g2 + mov %fp, %g3 + save %sp, -176, %sp + mov %g2, %l0 + ba,pt %xcc, ftrace_graph_caller + mov %g3, %l1 +#endif +2: +#endif +#endif + retl + nop + .size _mcount,.-_mcount + .size mcount,.-mcount + +#ifdef CONFIG_FUNCTION_TRACER + .globl ftrace_stub + .type ftrace_stub,#function +ftrace_stub: + retl + nop + .size ftrace_stub,.-ftrace_stub +#ifdef CONFIG_DYNAMIC_FTRACE + .globl ftrace_caller + .type ftrace_caller,#function +ftrace_caller: + mov %i7, %g2 + mov %fp, %g3 + save %sp, -176, %sp + mov %g2, %o1 + mov %g2, %l0 + mov %g3, %l1 + .globl ftrace_call +ftrace_call: + call ftrace_stub + mov %i7, %o0 +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + .globl ftrace_graph_call +ftrace_graph_call: + call ftrace_stub + nop +#endif + ret + restore +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + .size ftrace_graph_call,.-ftrace_graph_call +#endif + .size ftrace_call,.-ftrace_call + .size ftrace_caller,.-ftrace_caller +#endif +#endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(ftrace_graph_caller) + mov %l0, %o0 + mov %i7, %o1 + call prepare_ftrace_return + mov %l1, %o2 + ret + restore %o0, -8, %i7 +END(ftrace_graph_caller) + +ENTRY(return_to_handler) + save %sp, -176, %sp + call ftrace_return_to_handler + mov %fp, %o0 + jmpl %o0 + 8, %g0 + restore +END(return_to_handler) +#endif |