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3394aafdc8
[ Upstream commit 756276ce78d5624dc814f9d99f7d16c8fd51076e ] On MIPS system, most of the syscall function name begin with prefix sys_. Some syscalls are special such as clone/fork, function name of these begin with __sys_. Since scratch registers need be saved in stack when these system calls happens. With ftrace system call method, system call functions are declared with SYSCALL_DEFINEx, metadata of the system call symbol name begins with sys_. Here mips specific function arch_syscall_match_sym_name is used to compare function name between sys_call_table[] and metadata of syscall symbol. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive for
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* more details.
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*
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* Copyright (C) 2009 DSLab, Lanzhou University, China
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* Author: Wu Zhangjin <wuzhangjin@gmail.com>
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*/
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#ifndef _ASM_MIPS_FTRACE_H
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#define _ASM_MIPS_FTRACE_H
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#ifdef CONFIG_FUNCTION_TRACER
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#define MCOUNT_ADDR ((unsigned long)(_mcount))
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#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
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#ifndef __ASSEMBLY__
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extern void _mcount(void);
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#define mcount _mcount
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#define safe_load(load, src, dst, error) \
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do { \
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asm volatile ( \
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"1: " load " %[tmp_dst], 0(%[tmp_src])\n" \
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" li %[tmp_err], 0\n" \
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"2: .insn\n" \
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\
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".section .fixup, \"ax\"\n" \
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"3: li %[tmp_err], 1\n" \
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" j 2b\n" \
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".previous\n" \
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\
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".section\t__ex_table,\"a\"\n\t" \
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STR(PTR_WD) "\t1b, 3b\n\t" \
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".previous\n" \
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\
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: [tmp_dst] "=&r" (dst), [tmp_err] "=r" (error)\
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: [tmp_src] "r" (src) \
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: "memory" \
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); \
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} while (0)
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#define safe_store(store, src, dst, error) \
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do { \
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asm volatile ( \
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"1: " store " %[tmp_src], 0(%[tmp_dst])\n"\
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" li %[tmp_err], 0\n" \
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"2: .insn\n" \
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\
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".section .fixup, \"ax\"\n" \
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"3: li %[tmp_err], 1\n" \
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" j 2b\n" \
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".previous\n" \
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\
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".section\t__ex_table,\"a\"\n\t"\
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STR(PTR_WD) "\t1b, 3b\n\t" \
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".previous\n" \
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\
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: [tmp_err] "=r" (error) \
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: [tmp_dst] "r" (dst), [tmp_src] "r" (src)\
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: "memory" \
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); \
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} while (0)
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#define safe_load_code(dst, src, error) \
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safe_load(STR(lw), src, dst, error)
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#define safe_store_code(src, dst, error) \
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safe_store(STR(sw), src, dst, error)
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#define safe_load_stack(dst, src, error) \
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safe_load(STR(PTR_L), src, dst, error)
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#define safe_store_stack(src, dst, error) \
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safe_store(STR(PTR_S), src, dst, error)
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#ifdef CONFIG_DYNAMIC_FTRACE
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static inline unsigned long ftrace_call_adjust(unsigned long addr)
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{
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return addr;
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}
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struct dyn_arch_ftrace {
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};
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#endif /* CONFIG_DYNAMIC_FTRACE */
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_FUNCTION_TRACER */
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#ifdef CONFIG_FTRACE_SYSCALLS
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#ifndef __ASSEMBLY__
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/*
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* Some syscall entry functions on mips start with "__sys_" (fork and clone,
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* for instance). We should also match the sys_ variant with those.
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*/
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#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
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static inline bool arch_syscall_match_sym_name(const char *sym,
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const char *name)
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{
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return !strcmp(sym, name) ||
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(!strncmp(sym, "__sys_", 6) && !strcmp(sym + 6, name + 4));
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}
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_FTRACE_SYSCALLS */
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#endif /* _ASM_MIPS_FTRACE_H */
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