79f32b221b
Teach ftrace_make_call() and ftrace_make_nop() about PLTs. Teach PLT code about FTRACE and all its callbacks. Otherwise the following might happen: ------------[ cut here ]------------ WARNING: CPU: 14 PID: 2265 at .../arch/arm/kernel/insn.c:14 __arm_gen_branch+0x83/0x8c() ... Hardware name: LSI Axxia AXM55XX [<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14) [<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8) [<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90) [<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c) [<c03218f3>] (warn_slowpath_null) from [<c03143cf>] (__arm_gen_branch+0x83/0x8c) [<c03143cf>] (__arm_gen_branch) from [<c0314337>] (ftrace_make_nop+0xf/0x24) [<c0314337>] (ftrace_make_nop) from [<c038ebcb>] (ftrace_process_locs+0x27b/0x3e8) [<c038ebcb>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44) [<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84) [<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18) ---[ end trace e1b64ced7a89adcc ]--- ------------[ cut here ]------------ WARNING: CPU: 14 PID: 2265 at .../kernel/trace/ftrace.c:1979 ftrace_bug+0x1b1/0x234() ... Hardware name: LSI Axxia AXM55XX [<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14) [<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8) [<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90) [<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c) [<c03218f3>] (warn_slowpath_null) from [<c038e87d>] (ftrace_bug+0x1b1/0x234) [<c038e87d>] (ftrace_bug) from [<c038ebd5>] (ftrace_process_locs+0x285/0x3e8) [<c038ebd5>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44) [<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84) [<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18) ---[ end trace e1b64ced7a89adcd ]--- ftrace failed to modify [<e9ef7006>] 0xe9ef7006 actual: 02:f0:3b:fa ftrace record flags: 0 (0) expected tramp: c0314265 Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_ARM_MODULE_H
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#define _ASM_ARM_MODULE_H
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#include <asm-generic/module.h>
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struct unwind_table;
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#ifdef CONFIG_ARM_UNWIND
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enum {
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ARM_SEC_INIT,
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ARM_SEC_DEVINIT,
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ARM_SEC_CORE,
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ARM_SEC_EXIT,
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ARM_SEC_DEVEXIT,
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ARM_SEC_HOT,
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ARM_SEC_UNLIKELY,
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ARM_SEC_MAX,
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};
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#endif
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#define PLT_ENT_STRIDE L1_CACHE_BYTES
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#define PLT_ENT_COUNT (PLT_ENT_STRIDE / sizeof(u32))
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#define PLT_ENT_SIZE (sizeof(struct plt_entries) / PLT_ENT_COUNT)
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struct plt_entries {
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u32 ldr[PLT_ENT_COUNT];
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u32 lit[PLT_ENT_COUNT];
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};
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struct mod_plt_sec {
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struct elf32_shdr *plt;
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struct plt_entries *plt_ent;
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int plt_count;
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};
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struct mod_arch_specific {
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#ifdef CONFIG_ARM_UNWIND
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struct unwind_table *unwind[ARM_SEC_MAX];
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#endif
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#ifdef CONFIG_ARM_MODULE_PLTS
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struct mod_plt_sec core;
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struct mod_plt_sec init;
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#endif
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};
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struct module;
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u32 get_module_plt(struct module *mod, unsigned long loc, Elf32_Addr val);
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#ifdef CONFIG_THUMB2_KERNEL
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#define HAVE_ARCH_KALLSYMS_SYMBOL_VALUE
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static inline unsigned long kallsyms_symbol_value(const Elf_Sym *sym)
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{
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if (ELF_ST_TYPE(sym->st_info) == STT_FUNC)
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return sym->st_value & ~1;
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return sym->st_value;
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}
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#endif
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#endif /* _ASM_ARM_MODULE_H */
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