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arm64: Exception handling
The patch contains the exception entry code (kernel/entry.S), pt_regs structure and related accessors, undefined instruction trapping and stack tracing. AArch64 Linux kernel (including kernel threads) runs in EL1 mode using the SP1 stack. The vectors don't have a fixed address, only alignment (2^11) requirements. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Catalin Marinas
parent
9703d9d7f7
commit
60ffc30d56
212
arch/arm64/include/asm/ptrace.h
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212
arch/arm64/include/asm/ptrace.h
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@ -0,0 +1,212 @@
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/*
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* Based on arch/arm/include/asm/ptrace.h
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*
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* Copyright (C) 1996-2003 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_PTRACE_H
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#define __ASM_PTRACE_H
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#include <linux/types.h>
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#include <asm/hwcap.h>
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#define PTRACE_GETREGS 12
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#define PTRACE_SETREGS 13
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#define PTRACE_GETFPSIMDREGS 14
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#define PTRACE_SETFPSIMDREGS 15
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/* PTRACE_ATTACH is 16 */
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/* PTRACE_DETACH is 17 */
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#define PTRACE_GET_THREAD_AREA 22
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#define PTRACE_SET_SYSCALL 23
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#define PTRACE_GETHBPREGS 29
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#define PTRACE_SETHBPREGS 30
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/* AArch32-specific ptrace requests */
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#define COMPAT_PTRACE_GETVFPREGS 27
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#define COMPAT_PTRACE_SETVFPREGS 28
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/*
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* PSR bits
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*/
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#define PSR_MODE_EL0t 0x00000000
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#define PSR_MODE_EL1t 0x00000004
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#define PSR_MODE_EL1h 0x00000005
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#define PSR_MODE_EL2t 0x00000008
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#define PSR_MODE_EL2h 0x00000009
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#define PSR_MODE_EL3t 0x0000000c
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#define PSR_MODE_EL3h 0x0000000d
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#define PSR_MODE_MASK 0x0000000f
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/* AArch32 CPSR bits */
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#define PSR_MODE32_BIT 0x00000010
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#define COMPAT_PSR_MODE_USR 0x00000010
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#define COMPAT_PSR_T_BIT 0x00000020
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#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */
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/* AArch64 SPSR bits */
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#define PSR_F_BIT 0x00000040
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#define PSR_I_BIT 0x00000080
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#define PSR_A_BIT 0x00000100
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#define PSR_D_BIT 0x00000200
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#define PSR_Q_BIT 0x08000000
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#define PSR_V_BIT 0x10000000
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#define PSR_C_BIT 0x20000000
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#define PSR_Z_BIT 0x40000000
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#define PSR_N_BIT 0x80000000
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/*
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* Groups of PSR bits
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*/
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#define PSR_f 0xff000000 /* Flags */
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#define PSR_s 0x00ff0000 /* Status */
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#define PSR_x 0x0000ff00 /* Extension */
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#define PSR_c 0x000000ff /* Control */
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/*
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* These are 'magic' values for PTRACE_PEEKUSR that return info about where a
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* process is located in memory.
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*/
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#define PT_TEXT_ADDR 0x10000
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#define PT_DATA_ADDR 0x10004
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#define PT_TEXT_END_ADDR 0x10008
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#ifndef __ASSEMBLY__
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/*
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* User structures for general purpose, floating point and debug registers.
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*/
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struct user_pt_regs {
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__u64 regs[31];
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__u64 sp;
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__u64 pc;
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__u64 pstate;
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};
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struct user_fpsimd_state {
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__uint128_t vregs[32];
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__u32 fpsr;
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__u32 fpcr;
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};
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struct user_hwdebug_state {
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__u32 dbg_info;
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struct {
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__u64 addr;
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__u32 ctrl;
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} dbg_regs[16];
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};
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#ifdef __KERNEL__
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/* sizeof(struct user) for AArch32 */
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#define COMPAT_USER_SZ 296
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/* AArch32 uses x13 as the stack pointer... */
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#define compat_sp regs[13]
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/* ... and x14 as the link register. */
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#define compat_lr regs[14]
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/*
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* This struct defines the way the registers are stored on the stack during an
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* exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for
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* stack alignment). struct user_pt_regs must form a prefix of struct pt_regs.
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*/
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struct pt_regs {
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union {
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struct user_pt_regs user_regs;
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struct {
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u64 regs[31];
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u64 sp;
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u64 pc;
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u64 pstate;
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};
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};
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u64 orig_x0;
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u64 syscallno;
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};
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#define arch_has_single_step() (1)
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#ifdef CONFIG_COMPAT
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#define compat_thumb_mode(regs) \
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(((regs)->pstate & COMPAT_PSR_T_BIT))
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#else
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#define compat_thumb_mode(regs) (0)
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#endif
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#define user_mode(regs) \
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(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)
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#define compat_user_mode(regs) \
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(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
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(PSR_MODE32_BIT | PSR_MODE_EL0t))
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#define processor_mode(regs) \
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((regs)->pstate & PSR_MODE_MASK)
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#define interrupts_enabled(regs) \
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(!((regs)->pstate & PSR_I_BIT))
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#define fast_interrupts_enabled(regs) \
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(!((regs)->pstate & PSR_F_BIT))
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#define user_stack_pointer(regs) \
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((regs)->sp)
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/*
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* Are the current registers suitable for user mode? (used to maintain
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* security in signal handlers)
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*/
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static inline int valid_user_regs(struct user_pt_regs *regs)
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{
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if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) {
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regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT);
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/* The T bit is reserved for AArch64 */
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if (!(regs->pstate & PSR_MODE32_BIT))
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regs->pstate &= ~COMPAT_PSR_T_BIT;
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return 1;
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}
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/*
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* Force PSR to something logical...
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*/
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regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \
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COMPAT_PSR_T_BIT | PSR_MODE32_BIT;
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if (!(regs->pstate & PSR_MODE32_BIT)) {
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regs->pstate &= ~COMPAT_PSR_T_BIT;
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regs->pstate |= PSR_MODE_EL0t;
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}
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return 0;
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}
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#define instruction_pointer(regs) (regs)->pc
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#ifdef CONFIG_SMP
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extern unsigned long profile_pc(struct pt_regs *regs);
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#else
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#define profile_pc(regs) instruction_pointer(regs)
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#endif
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extern int aarch32_break_trap(struct pt_regs *regs);
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#endif /* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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#endif
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29
arch/arm64/include/asm/stacktrace.h
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29
arch/arm64/include/asm/stacktrace.h
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@ -0,0 +1,29 @@
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/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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struct stackframe {
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unsigned long fp;
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unsigned long sp;
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unsigned long pc;
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};
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extern int unwind_frame(struct stackframe *frame);
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extern void walk_stackframe(struct stackframe *frame,
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int (*fn)(struct stackframe *, void *), void *data);
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#endif /* __ASM_STACKTRACE_H */
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30
arch/arm64/include/asm/traps.h
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30
arch/arm64/include/asm/traps.h
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@ -0,0 +1,30 @@
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/*
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* Based on arch/arm/include/asm/traps.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_TRAP_H
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#define __ASM_TRAP_H
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static inline int in_exception_text(unsigned long ptr)
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{
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extern char __exception_text_start[];
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extern char __exception_text_end[];
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return ptr >= (unsigned long)&__exception_text_start &&
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ptr < (unsigned long)&__exception_text_end;
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}
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#endif
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695
arch/arm64/kernel/entry.S
Normal file
695
arch/arm64/kernel/entry.S
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@ -0,0 +1,695 @@
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/*
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* Low-level exception handling code
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*
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* Copyright (C) 2012 ARM Ltd.
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* Authors: Catalin Marinas <catalin.marinas@arm.com>
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* Will Deacon <will.deacon@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/errno.h>
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#include <asm/thread_info.h>
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#include <asm/unistd.h>
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/*
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* Bad Abort numbers
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*-----------------
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*/
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#define BAD_SYNC 0
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#define BAD_IRQ 1
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#define BAD_FIQ 2
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#define BAD_ERROR 3
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.macro kernel_entry, el, regsize = 64
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sub sp, sp, #S_FRAME_SIZE - S_LR // room for LR, SP, SPSR, ELR
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.if \regsize == 32
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mov w0, w0 // zero upper 32 bits of x0
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.endif
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push x28, x29
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push x26, x27
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push x24, x25
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push x22, x23
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push x20, x21
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push x18, x19
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push x16, x17
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push x14, x15
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push x12, x13
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push x10, x11
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push x8, x9
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push x6, x7
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push x4, x5
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push x2, x3
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push x0, x1
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.if \el == 0
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mrs x21, sp_el0
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.else
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add x21, sp, #S_FRAME_SIZE
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.endif
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mrs x22, elr_el1
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mrs x23, spsr_el1
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stp lr, x21, [sp, #S_LR]
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stp x22, x23, [sp, #S_PC]
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/*
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* Set syscallno to -1 by default (overridden later if real syscall).
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*/
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.if \el == 0
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mvn x21, xzr
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str x21, [sp, #S_SYSCALLNO]
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.endif
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/*
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* Registers that may be useful after this macro is invoked:
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*
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* x21 - aborted SP
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* x22 - aborted PC
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* x23 - aborted PSTATE
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*/
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.endm
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.macro kernel_exit, el, ret = 0
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ldp x21, x22, [sp, #S_PC] // load ELR, SPSR
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.if \el == 0
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ldr x23, [sp, #S_SP] // load return stack pointer
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.endif
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.if \ret
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ldr x1, [sp, #S_X1] // preserve x0 (syscall return)
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add sp, sp, S_X2
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.else
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pop x0, x1
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.endif
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pop x2, x3 // load the rest of the registers
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pop x4, x5
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pop x6, x7
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pop x8, x9
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msr elr_el1, x21 // set up the return data
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msr spsr_el1, x22
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.if \el == 0
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msr sp_el0, x23
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.endif
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pop x10, x11
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pop x12, x13
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pop x14, x15
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pop x16, x17
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pop x18, x19
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pop x20, x21
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pop x22, x23
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pop x24, x25
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pop x26, x27
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pop x28, x29
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ldr lr, [sp], #S_FRAME_SIZE - S_LR // load LR and restore SP
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eret // return to kernel
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.endm
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.macro get_thread_info, rd
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mov \rd, sp
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and \rd, \rd, #~((1 << 13) - 1) // top of 8K stack
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.endm
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/*
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* These are the registers used in the syscall handler, and allow us to
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* have in theory up to 7 arguments to a function - x0 to x6.
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*
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* x7 is reserved for the system call number in 32-bit mode.
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*/
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sc_nr .req x25 // number of system calls
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scno .req x26 // syscall number
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stbl .req x27 // syscall table pointer
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tsk .req x28 // current thread_info
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/*
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* Interrupt handling.
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*/
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.macro irq_handler
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ldr x1, handle_arch_irq
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mov x0, sp
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blr x1
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.endm
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.text
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/*
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* Exception vectors.
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*/
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.macro ventry label
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.align 7
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b \label
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.endm
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.align 11
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ENTRY(vectors)
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ventry el1_sync_invalid // Synchronous EL1t
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ventry el1_irq_invalid // IRQ EL1t
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ventry el1_fiq_invalid // FIQ EL1t
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ventry el1_error_invalid // Error EL1t
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ventry el1_sync // Synchronous EL1h
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ventry el1_irq // IRQ EL1h
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ventry el1_fiq_invalid // FIQ EL1h
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ventry el1_error_invalid // Error EL1h
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ventry el0_sync // Synchronous 64-bit EL0
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ventry el0_irq // IRQ 64-bit EL0
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ventry el0_fiq_invalid // FIQ 64-bit EL0
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ventry el0_error_invalid // Error 64-bit EL0
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#ifdef CONFIG_COMPAT
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ventry el0_sync_compat // Synchronous 32-bit EL0
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ventry el0_irq_compat // IRQ 32-bit EL0
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ventry el0_fiq_invalid_compat // FIQ 32-bit EL0
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ventry el0_error_invalid_compat // Error 32-bit EL0
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#else
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ventry el0_sync_invalid // Synchronous 32-bit EL0
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ventry el0_irq_invalid // IRQ 32-bit EL0
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ventry el0_fiq_invalid // FIQ 32-bit EL0
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ventry el0_error_invalid // Error 32-bit EL0
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#endif
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END(vectors)
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/*
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* Invalid mode handlers
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*/
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.macro inv_entry, el, reason, regsize = 64
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kernel_entry el, \regsize
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mov x0, sp
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mov x1, #\reason
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mrs x2, esr_el1
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b bad_mode
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.endm
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||||
el0_sync_invalid:
|
||||
inv_entry 0, BAD_SYNC
|
||||
ENDPROC(el0_sync_invalid)
|
||||
|
||||
el0_irq_invalid:
|
||||
inv_entry 0, BAD_IRQ
|
||||
ENDPROC(el0_irq_invalid)
|
||||
|
||||
el0_fiq_invalid:
|
||||
inv_entry 0, BAD_FIQ
|
||||
ENDPROC(el0_fiq_invalid)
|
||||
|
||||
el0_error_invalid:
|
||||
inv_entry 0, BAD_ERROR
|
||||
ENDPROC(el0_error_invalid)
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
el0_fiq_invalid_compat:
|
||||
inv_entry 0, BAD_FIQ, 32
|
||||
ENDPROC(el0_fiq_invalid_compat)
|
||||
|
||||
el0_error_invalid_compat:
|
||||
inv_entry 0, BAD_ERROR, 32
|
||||
ENDPROC(el0_error_invalid_compat)
|
||||
#endif
|
||||
|
||||
el1_sync_invalid:
|
||||
inv_entry 1, BAD_SYNC
|
||||
ENDPROC(el1_sync_invalid)
|
||||
|
||||
el1_irq_invalid:
|
||||
inv_entry 1, BAD_IRQ
|
||||
ENDPROC(el1_irq_invalid)
|
||||
|
||||
el1_fiq_invalid:
|
||||
inv_entry 1, BAD_FIQ
|
||||
ENDPROC(el1_fiq_invalid)
|
||||
|
||||
el1_error_invalid:
|
||||
inv_entry 1, BAD_ERROR
|
||||
ENDPROC(el1_error_invalid)
|
||||
|
||||
/*
|
||||
* EL1 mode handlers.
|
||||
*/
|
||||
.align 6
|
||||
el1_sync:
|
||||
kernel_entry 1
|
||||
mrs x1, esr_el1 // read the syndrome register
|
||||
lsr x24, x1, #26 // exception class
|
||||
cmp x24, #0x25 // data abort in EL1
|
||||
b.eq el1_da
|
||||
cmp x24, #0x18 // configurable trap
|
||||
b.eq el1_undef
|
||||
cmp x24, #0x26 // stack alignment exception
|
||||
b.eq el1_sp_pc
|
||||
cmp x24, #0x22 // pc alignment exception
|
||||
b.eq el1_sp_pc
|
||||
cmp x24, #0x00 // unknown exception in EL1
|
||||
b.eq el1_undef
|
||||
cmp x24, #0x30 // debug exception in EL1
|
||||
b.ge el1_dbg
|
||||
b el1_inv
|
||||
el1_da:
|
||||
/*
|
||||
* Data abort handling
|
||||
*/
|
||||
mrs x0, far_el1
|
||||
enable_dbg_if_not_stepping x2
|
||||
// re-enable interrupts if they were enabled in the aborted context
|
||||
tbnz x23, #7, 1f // PSR_I_BIT
|
||||
enable_irq
|
||||
1:
|
||||
mov x2, sp // struct pt_regs
|
||||
bl do_mem_abort
|
||||
|
||||
// disable interrupts before pulling preserved data off the stack
|
||||
disable_irq
|
||||
kernel_exit 1
|
||||
el1_sp_pc:
|
||||
/*
|
||||
* Stack or PC alignment exception handling
|
||||
*/
|
||||
mrs x0, far_el1
|
||||
mov x1, x25
|
||||
mov x2, sp
|
||||
b do_sp_pc_abort
|
||||
el1_undef:
|
||||
/*
|
||||
* Undefined instruction
|
||||
*/
|
||||
mov x0, sp
|
||||
b do_undefinstr
|
||||
el1_dbg:
|
||||
/*
|
||||
* Debug exception handling
|
||||
*/
|
||||
tbz x24, #0, el1_inv // EL1 only
|
||||
mrs x0, far_el1
|
||||
mov x2, sp // struct pt_regs
|
||||
bl do_debug_exception
|
||||
|
||||
kernel_exit 1
|
||||
el1_inv:
|
||||
// TODO: add support for undefined instructions in kernel mode
|
||||
mov x0, sp
|
||||
mov x1, #BAD_SYNC
|
||||
mrs x2, esr_el1
|
||||
b bad_mode
|
||||
ENDPROC(el1_sync)
|
||||
|
||||
.align 6
|
||||
el1_irq:
|
||||
kernel_entry 1
|
||||
enable_dbg_if_not_stepping x0
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
bl trace_hardirqs_off
|
||||
#endif
|
||||
#ifdef CONFIG_PREEMPT
|
||||
get_thread_info tsk
|
||||
ldr x24, [tsk, #TI_PREEMPT] // get preempt count
|
||||
add x0, x24, #1 // increment it
|
||||
str x0, [tsk, #TI_PREEMPT]
|
||||
#endif
|
||||
irq_handler
|
||||
#ifdef CONFIG_PREEMPT
|
||||
str x24, [tsk, #TI_PREEMPT] // restore preempt count
|
||||
cbnz x24, 1f // preempt count != 0
|
||||
ldr x0, [tsk, #TI_FLAGS] // get flags
|
||||
tbz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling?
|
||||
bl el1_preempt
|
||||
1:
|
||||
#endif
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
bl trace_hardirqs_on
|
||||
#endif
|
||||
kernel_exit 1
|
||||
ENDPROC(el1_irq)
|
||||
|
||||
#ifdef CONFIG_PREEMPT
|
||||
el1_preempt:
|
||||
mov x24, lr
|
||||
1: enable_dbg
|
||||
bl preempt_schedule_irq // irq en/disable is done inside
|
||||
ldr x0, [tsk, #TI_FLAGS] // get new tasks TI_FLAGS
|
||||
tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling?
|
||||
ret x24
|
||||
#endif
|
||||
|
||||
/*
|
||||
* EL0 mode handlers.
|
||||
*/
|
||||
.align 6
|
||||
el0_sync:
|
||||
kernel_entry 0
|
||||
mrs x25, esr_el1 // read the syndrome register
|
||||
lsr x24, x25, #26 // exception class
|
||||
cmp x24, #0x15 // SVC in 64-bit state
|
||||
b.eq el0_svc
|
||||
adr lr, ret_from_exception
|
||||
cmp x24, #0x24 // data abort in EL0
|
||||
b.eq el0_da
|
||||
cmp x24, #0x20 // instruction abort in EL0
|
||||
b.eq el0_ia
|
||||
cmp x24, #0x07 // FP/ASIMD access
|
||||
b.eq el0_fpsimd_acc
|
||||
cmp x24, #0x2c // FP/ASIMD exception
|
||||
b.eq el0_fpsimd_exc
|
||||
cmp x24, #0x18 // configurable trap
|
||||
b.eq el0_undef
|
||||
cmp x24, #0x26 // stack alignment exception
|
||||
b.eq el0_sp_pc
|
||||
cmp x24, #0x22 // pc alignment exception
|
||||
b.eq el0_sp_pc
|
||||
cmp x24, #0x00 // unknown exception in EL0
|
||||
b.eq el0_undef
|
||||
cmp x24, #0x30 // debug exception in EL0
|
||||
b.ge el0_dbg
|
||||
b el0_inv
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
.align 6
|
||||
el0_sync_compat:
|
||||
kernel_entry 0, 32
|
||||
mrs x25, esr_el1 // read the syndrome register
|
||||
lsr x24, x25, #26 // exception class
|
||||
cmp x24, #0x11 // SVC in 32-bit state
|
||||
b.eq el0_svc_compat
|
||||
adr lr, ret_from_exception
|
||||
cmp x24, #0x24 // data abort in EL0
|
||||
b.eq el0_da
|
||||
cmp x24, #0x20 // instruction abort in EL0
|
||||
b.eq el0_ia
|
||||
cmp x24, #0x07 // FP/ASIMD access
|
||||
b.eq el0_fpsimd_acc
|
||||
cmp x24, #0x28 // FP/ASIMD exception
|
||||
b.eq el0_fpsimd_exc
|
||||
cmp x24, #0x00 // unknown exception in EL0
|
||||
b.eq el0_undef
|
||||
cmp x24, #0x30 // debug exception in EL0
|
||||
b.ge el0_dbg
|
||||
b el0_inv
|
||||
el0_svc_compat:
|
||||
/*
|
||||
* AArch32 syscall handling
|
||||
*/
|
||||
adr stbl, compat_sys_call_table // load compat syscall table pointer
|
||||
uxtw scno, w7 // syscall number in w7 (r7)
|
||||
mov sc_nr, #__NR_compat_syscalls
|
||||
b el0_svc_naked
|
||||
|
||||
.align 6
|
||||
el0_irq_compat:
|
||||
kernel_entry 0, 32
|
||||
b el0_irq_naked
|
||||
#endif
|
||||
|
||||
el0_da:
|
||||
/*
|
||||
* Data abort handling
|
||||
*/
|
||||
mrs x0, far_el1
|
||||
disable_step x1
|
||||
isb
|
||||
enable_dbg
|
||||
// enable interrupts before calling the main handler
|
||||
enable_irq
|
||||
mov x1, x25
|
||||
mov x2, sp
|
||||
b do_mem_abort
|
||||
el0_ia:
|
||||
/*
|
||||
* Instruction abort handling
|
||||
*/
|
||||
mrs x0, far_el1
|
||||
disable_step x1
|
||||
isb
|
||||
enable_dbg
|
||||
// enable interrupts before calling the main handler
|
||||
enable_irq
|
||||
orr x1, x25, #1 << 24 // use reserved ISS bit for instruction aborts
|
||||
mov x2, sp
|
||||
b do_mem_abort
|
||||
el0_fpsimd_acc:
|
||||
/*
|
||||
* Floating Point or Advanced SIMD access
|
||||
*/
|
||||
mov x0, x25
|
||||
mov x1, sp
|
||||
b do_fpsimd_acc
|
||||
el0_fpsimd_exc:
|
||||
/*
|
||||
* Floating Point or Advanced SIMD exception
|
||||
*/
|
||||
mov x0, x25
|
||||
mov x1, sp
|
||||
b do_fpsimd_exc
|
||||
el0_sp_pc:
|
||||
/*
|
||||
* Stack or PC alignment exception handling
|
||||
*/
|
||||
mrs x0, far_el1
|
||||
disable_step x1
|
||||
isb
|
||||
enable_dbg
|
||||
// enable interrupts before calling the main handler
|
||||
enable_irq
|
||||
mov x1, x25
|
||||
mov x2, sp
|
||||
b do_sp_pc_abort
|
||||
el0_undef:
|
||||
/*
|
||||
* Undefined instruction
|
||||
*/
|
||||
mov x0, sp
|
||||
b do_undefinstr
|
||||
el0_dbg:
|
||||
/*
|
||||
* Debug exception handling
|
||||
*/
|
||||
tbnz x24, #0, el0_inv // EL0 only
|
||||
mrs x0, far_el1
|
||||
disable_step x1
|
||||
mov x1, x25
|
||||
mov x2, sp
|
||||
b do_debug_exception
|
||||
el0_inv:
|
||||
mov x0, sp
|
||||
mov x1, #BAD_SYNC
|
||||
mrs x2, esr_el1
|
||||
b bad_mode
|
||||
ENDPROC(el0_sync)
|
||||
|
||||
.align 6
|
||||
el0_irq:
|
||||
kernel_entry 0
|
||||
el0_irq_naked:
|
||||
disable_step x1
|
||||
isb
|
||||
enable_dbg
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
bl trace_hardirqs_off
|
||||
#endif
|
||||
get_thread_info tsk
|
||||
#ifdef CONFIG_PREEMPT
|
||||
ldr x24, [tsk, #TI_PREEMPT] // get preempt count
|
||||
add x23, x24, #1 // increment it
|
||||
str x23, [tsk, #TI_PREEMPT]
|
||||
#endif
|
||||
irq_handler
|
||||
#ifdef CONFIG_PREEMPT
|
||||
ldr x0, [tsk, #TI_PREEMPT]
|
||||
str x24, [tsk, #TI_PREEMPT]
|
||||
cmp x0, x23
|
||||
b.eq 1f
|
||||
mov x1, #0
|
||||
str x1, [x1] // BUG
|
||||
1:
|
||||
#endif
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
bl trace_hardirqs_on
|
||||
#endif
|
||||
b ret_to_user
|
||||
ENDPROC(el0_irq)
|
||||
|
||||
/*
|
||||
* This is the return code to user mode for abort handlers
|
||||
*/
|
||||
ret_from_exception:
|
||||
get_thread_info tsk
|
||||
b ret_to_user
|
||||
ENDPROC(ret_from_exception)
|
||||
|
||||
/*
|
||||
* Register switch for AArch64. The callee-saved registers need to be saved
|
||||
* and restored. On entry:
|
||||
* x0 = previous task_struct (must be preserved across the switch)
|
||||
* x1 = next task_struct
|
||||
* Previous and next are guaranteed not to be the same.
|
||||
*
|
||||
*/
|
||||
ENTRY(cpu_switch_to)
|
||||
add x8, x0, #THREAD_CPU_CONTEXT
|
||||
mov x9, sp
|
||||
stp x19, x20, [x8], #16 // store callee-saved registers
|
||||
stp x21, x22, [x8], #16
|
||||
stp x23, x24, [x8], #16
|
||||
stp x25, x26, [x8], #16
|
||||
stp x27, x28, [x8], #16
|
||||
stp x29, x9, [x8], #16
|
||||
str lr, [x8]
|
||||
add x8, x1, #THREAD_CPU_CONTEXT
|
||||
ldp x19, x20, [x8], #16 // restore callee-saved registers
|
||||
ldp x21, x22, [x8], #16
|
||||
ldp x23, x24, [x8], #16
|
||||
ldp x25, x26, [x8], #16
|
||||
ldp x27, x28, [x8], #16
|
||||
ldp x29, x9, [x8], #16
|
||||
ldr lr, [x8]
|
||||
mov sp, x9
|
||||
ret
|
||||
ENDPROC(cpu_switch_to)
|
||||
|
||||
/*
|
||||
* This is the fast syscall return path. We do as little as possible here,
|
||||
* and this includes saving x0 back into the kernel stack.
|
||||
*/
|
||||
ret_fast_syscall:
|
||||
disable_irq // disable interrupts
|
||||
ldr x1, [tsk, #TI_FLAGS]
|
||||
and x2, x1, #_TIF_WORK_MASK
|
||||
cbnz x2, fast_work_pending
|
||||
tbz x1, #TIF_SINGLESTEP, fast_exit
|
||||
disable_dbg
|
||||
enable_step x2
|
||||
fast_exit:
|
||||
kernel_exit 0, ret = 1
|
||||
|
||||
/*
|
||||
* Ok, we need to do extra processing, enter the slow path.
|
||||
*/
|
||||
fast_work_pending:
|
||||
str x0, [sp, #S_X0] // returned x0
|
||||
work_pending:
|
||||
tbnz x1, #TIF_NEED_RESCHED, work_resched
|
||||
/* TIF_SIGPENDING or TIF_NOTIFY_RESUME case */
|
||||
ldr x2, [sp, #S_PSTATE]
|
||||
mov x0, sp // 'regs'
|
||||
tst x2, #PSR_MODE_MASK // user mode regs?
|
||||
b.ne no_work_pending // returning to kernel
|
||||
bl do_notify_resume
|
||||
b ret_to_user
|
||||
work_resched:
|
||||
enable_dbg
|
||||
bl schedule
|
||||
|
||||
/*
|
||||
* "slow" syscall return path.
|
||||
*/
|
||||
ENTRY(ret_to_user)
|
||||
disable_irq // disable interrupts
|
||||
ldr x1, [tsk, #TI_FLAGS]
|
||||
and x2, x1, #_TIF_WORK_MASK
|
||||
cbnz x2, work_pending
|
||||
tbz x1, #TIF_SINGLESTEP, no_work_pending
|
||||
disable_dbg
|
||||
enable_step x2
|
||||
no_work_pending:
|
||||
kernel_exit 0, ret = 0
|
||||
ENDPROC(ret_to_user)
|
||||
|
||||
/*
|
||||
* This is how we return from a fork.
|
||||
*/
|
||||
ENTRY(ret_from_fork)
|
||||
bl schedule_tail
|
||||
get_thread_info tsk
|
||||
b ret_to_user
|
||||
ENDPROC(ret_from_fork)
|
||||
|
||||
/*
|
||||
* SVC handler.
|
||||
*/
|
||||
.align 6
|
||||
el0_svc:
|
||||
adrp stbl, sys_call_table // load syscall table pointer
|
||||
uxtw scno, w8 // syscall number in w8
|
||||
mov sc_nr, #__NR_syscalls
|
||||
el0_svc_naked: // compat entry point
|
||||
stp x0, scno, [sp, #S_ORIG_X0] // save the original x0 and syscall number
|
||||
disable_step x16
|
||||
isb
|
||||
enable_dbg
|
||||
enable_irq
|
||||
|
||||
get_thread_info tsk
|
||||
ldr x16, [tsk, #TI_FLAGS] // check for syscall tracing
|
||||
tbnz x16, #TIF_SYSCALL_TRACE, __sys_trace // are we tracing syscalls?
|
||||
adr lr, ret_fast_syscall // return address
|
||||
cmp scno, sc_nr // check upper syscall limit
|
||||
b.hs ni_sys
|
||||
ldr x16, [stbl, scno, lsl #3] // address in the syscall table
|
||||
br x16 // call sys_* routine
|
||||
ni_sys:
|
||||
mov x0, sp
|
||||
b do_ni_syscall
|
||||
ENDPROC(el0_svc)
|
||||
|
||||
/*
|
||||
* This is the really slow path. We're going to be doing context
|
||||
* switches, and waiting for our parent to respond.
|
||||
*/
|
||||
__sys_trace:
|
||||
mov x1, sp
|
||||
mov w0, #0 // trace entry
|
||||
bl syscall_trace
|
||||
adr lr, __sys_trace_return // return address
|
||||
uxtw scno, w0 // syscall number (possibly new)
|
||||
mov x1, sp // pointer to regs
|
||||
cmp scno, sc_nr // check upper syscall limit
|
||||
b.hs ni_sys
|
||||
ldp x0, x1, [sp] // restore the syscall args
|
||||
ldp x2, x3, [sp, #S_X2]
|
||||
ldp x4, x5, [sp, #S_X4]
|
||||
ldp x6, x7, [sp, #S_X6]
|
||||
ldr x16, [stbl, scno, lsl #3] // address in the syscall table
|
||||
br x16 // call sys_* routine
|
||||
|
||||
__sys_trace_return:
|
||||
str x0, [sp] // save returned x0
|
||||
mov x1, sp
|
||||
mov w0, #1 // trace exit
|
||||
bl syscall_trace
|
||||
b ret_to_user
|
||||
|
||||
/*
|
||||
* Special system call wrappers.
|
||||
*/
|
||||
ENTRY(sys_execve_wrapper)
|
||||
mov x3, sp
|
||||
b sys_execve
|
||||
ENDPROC(sys_execve_wrapper)
|
||||
|
||||
ENTRY(sys_clone_wrapper)
|
||||
mov x5, sp
|
||||
b sys_clone
|
||||
ENDPROC(sys_clone_wrapper)
|
||||
|
||||
ENTRY(sys_rt_sigreturn_wrapper)
|
||||
mov x0, sp
|
||||
b sys_rt_sigreturn
|
||||
ENDPROC(sys_rt_sigreturn_wrapper)
|
||||
|
||||
ENTRY(sys_sigaltstack_wrapper)
|
||||
ldr x2, [sp, #S_SP]
|
||||
b sys_sigaltstack
|
||||
ENDPROC(sys_sigaltstack_wrapper)
|
||||
|
||||
ENTRY(handle_arch_irq)
|
||||
.quad 0
|
||||
127
arch/arm64/kernel/stacktrace.c
Normal file
127
arch/arm64/kernel/stacktrace.c
Normal file
@ -0,0 +1,127 @@
|
||||
/*
|
||||
* Stack tracing support
|
||||
*
|
||||
* Copyright (C) 2012 ARM Ltd.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/stacktrace.h>
|
||||
|
||||
#include <asm/stacktrace.h>
|
||||
|
||||
/*
|
||||
* AArch64 PCS assigns the frame pointer to x29.
|
||||
*
|
||||
* A simple function prologue looks like this:
|
||||
* sub sp, sp, #0x10
|
||||
* stp x29, x30, [sp]
|
||||
* mov x29, sp
|
||||
*
|
||||
* A simple function epilogue looks like this:
|
||||
* mov sp, x29
|
||||
* ldp x29, x30, [sp]
|
||||
* add sp, sp, #0x10
|
||||
*/
|
||||
int unwind_frame(struct stackframe *frame)
|
||||
{
|
||||
unsigned long high, low;
|
||||
unsigned long fp = frame->fp;
|
||||
|
||||
low = frame->sp;
|
||||
high = ALIGN(low, THREAD_SIZE);
|
||||
|
||||
if (fp < low || fp > high || fp & 0xf)
|
||||
return -EINVAL;
|
||||
|
||||
frame->sp = fp + 0x10;
|
||||
frame->fp = *(unsigned long *)(fp);
|
||||
frame->pc = *(unsigned long *)(fp + 8);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void notrace walk_stackframe(struct stackframe *frame,
|
||||
int (*fn)(struct stackframe *, void *), void *data)
|
||||
{
|
||||
while (1) {
|
||||
int ret;
|
||||
|
||||
if (fn(frame, data))
|
||||
break;
|
||||
ret = unwind_frame(frame);
|
||||
if (ret < 0)
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(walk_stackframe);
|
||||
|
||||
#ifdef CONFIG_STACKTRACE
|
||||
struct stack_trace_data {
|
||||
struct stack_trace *trace;
|
||||
unsigned int no_sched_functions;
|
||||
unsigned int skip;
|
||||
};
|
||||
|
||||
static int save_trace(struct stackframe *frame, void *d)
|
||||
{
|
||||
struct stack_trace_data *data = d;
|
||||
struct stack_trace *trace = data->trace;
|
||||
unsigned long addr = frame->pc;
|
||||
|
||||
if (data->no_sched_functions && in_sched_functions(addr))
|
||||
return 0;
|
||||
if (data->skip) {
|
||||
data->skip--;
|
||||
return 0;
|
||||
}
|
||||
|
||||
trace->entries[trace->nr_entries++] = addr;
|
||||
|
||||
return trace->nr_entries >= trace->max_entries;
|
||||
}
|
||||
|
||||
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
||||
{
|
||||
struct stack_trace_data data;
|
||||
struct stackframe frame;
|
||||
|
||||
data.trace = trace;
|
||||
data.skip = trace->skip;
|
||||
|
||||
if (tsk != current) {
|
||||
data.no_sched_functions = 1;
|
||||
frame.fp = thread_saved_fp(tsk);
|
||||
frame.sp = thread_saved_sp(tsk);
|
||||
frame.pc = thread_saved_pc(tsk);
|
||||
} else {
|
||||
register unsigned long current_sp asm("sp");
|
||||
data.no_sched_functions = 0;
|
||||
frame.fp = (unsigned long)__builtin_frame_address(0);
|
||||
frame.sp = current_sp;
|
||||
frame.pc = (unsigned long)save_stack_trace_tsk;
|
||||
}
|
||||
|
||||
walk_stackframe(&frame, save_trace, &data);
|
||||
if (trace->nr_entries < trace->max_entries)
|
||||
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
||||
}
|
||||
|
||||
void save_stack_trace(struct stack_trace *trace)
|
||||
{
|
||||
save_stack_trace_tsk(current, trace);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(save_stack_trace);
|
||||
#endif
|
||||
348
arch/arm64/kernel/traps.c
Normal file
348
arch/arm64/kernel/traps.c
Normal file
@ -0,0 +1,348 @@
|
||||
/*
|
||||
* Based on arch/arm/kernel/traps.c
|
||||
*
|
||||
* Copyright (C) 1995-2009 Russell King
|
||||
* Copyright (C) 2012 ARM Ltd.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#include <linux/signal.h>
|
||||
#include <linux/personality.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/hardirq.h>
|
||||
#include <linux/kdebug.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/kexec.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/syscalls.h>
|
||||
|
||||
#include <asm/atomic.h>
|
||||
#include <asm/traps.h>
|
||||
#include <asm/stacktrace.h>
|
||||
#include <asm/exception.h>
|
||||
#include <asm/system_misc.h>
|
||||
|
||||
static const char *handler[]= {
|
||||
"Synchronous Abort",
|
||||
"IRQ",
|
||||
"FIQ",
|
||||
"Error"
|
||||
};
|
||||
|
||||
int show_unhandled_signals = 1;
|
||||
|
||||
/*
|
||||
* Dump out the contents of some memory nicely...
|
||||
*/
|
||||
static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
|
||||
unsigned long top)
|
||||
{
|
||||
unsigned long first;
|
||||
mm_segment_t fs;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* We need to switch to kernel mode so that we can use __get_user
|
||||
* to safely read from kernel space. Note that we now dump the
|
||||
* code first, just in case the backtrace kills us.
|
||||
*/
|
||||
fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
|
||||
printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
|
||||
|
||||
for (first = bottom & ~31; first < top; first += 32) {
|
||||
unsigned long p;
|
||||
char str[sizeof(" 12345678") * 8 + 1];
|
||||
|
||||
memset(str, ' ', sizeof(str));
|
||||
str[sizeof(str) - 1] = '\0';
|
||||
|
||||
for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
|
||||
if (p >= bottom && p < top) {
|
||||
unsigned int val;
|
||||
if (__get_user(val, (unsigned int *)p) == 0)
|
||||
sprintf(str + i * 9, " %08x", val);
|
||||
else
|
||||
sprintf(str + i * 9, " ????????");
|
||||
}
|
||||
}
|
||||
printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
|
||||
}
|
||||
|
||||
set_fs(fs);
|
||||
}
|
||||
|
||||
static void dump_backtrace_entry(unsigned long where, unsigned long stack)
|
||||
{
|
||||
print_ip_sym(where);
|
||||
if (in_exception_text(where))
|
||||
dump_mem("", "Exception stack", stack,
|
||||
stack + sizeof(struct pt_regs));
|
||||
}
|
||||
|
||||
static void dump_instr(const char *lvl, struct pt_regs *regs)
|
||||
{
|
||||
unsigned long addr = instruction_pointer(regs);
|
||||
mm_segment_t fs;
|
||||
char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* We need to switch to kernel mode so that we can use __get_user
|
||||
* to safely read from kernel space. Note that we now dump the
|
||||
* code first, just in case the backtrace kills us.
|
||||
*/
|
||||
fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
|
||||
for (i = -4; i < 1; i++) {
|
||||
unsigned int val, bad;
|
||||
|
||||
bad = __get_user(val, &((u32 *)addr)[i]);
|
||||
|
||||
if (!bad)
|
||||
p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
|
||||
else {
|
||||
p += sprintf(p, "bad PC value");
|
||||
break;
|
||||
}
|
||||
}
|
||||
printk("%sCode: %s\n", lvl, str);
|
||||
|
||||
set_fs(fs);
|
||||
}
|
||||
|
||||
static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
|
||||
{
|
||||
struct stackframe frame;
|
||||
const register unsigned long current_sp asm ("sp");
|
||||
|
||||
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
|
||||
|
||||
if (!tsk)
|
||||
tsk = current;
|
||||
|
||||
if (regs) {
|
||||
frame.fp = regs->regs[29];
|
||||
frame.sp = regs->sp;
|
||||
frame.pc = regs->pc;
|
||||
} else if (tsk == current) {
|
||||
frame.fp = (unsigned long)__builtin_frame_address(0);
|
||||
frame.sp = current_sp;
|
||||
frame.pc = (unsigned long)dump_backtrace;
|
||||
} else {
|
||||
/*
|
||||
* task blocked in __switch_to
|
||||
*/
|
||||
frame.fp = thread_saved_fp(tsk);
|
||||
frame.sp = thread_saved_sp(tsk);
|
||||
frame.pc = thread_saved_pc(tsk);
|
||||
}
|
||||
|
||||
printk("Call trace:\n");
|
||||
while (1) {
|
||||
unsigned long where = frame.pc;
|
||||
int ret;
|
||||
|
||||
ret = unwind_frame(&frame);
|
||||
if (ret < 0)
|
||||
break;
|
||||
dump_backtrace_entry(where, frame.sp);
|
||||
}
|
||||
}
|
||||
|
||||
void dump_stack(void)
|
||||
{
|
||||
dump_backtrace(NULL, NULL);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(dump_stack);
|
||||
|
||||
void show_stack(struct task_struct *tsk, unsigned long *sp)
|
||||
{
|
||||
dump_backtrace(NULL, tsk);
|
||||
barrier();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PREEMPT
|
||||
#define S_PREEMPT " PREEMPT"
|
||||
#else
|
||||
#define S_PREEMPT ""
|
||||
#endif
|
||||
#ifdef CONFIG_SMP
|
||||
#define S_SMP " SMP"
|
||||
#else
|
||||
#define S_SMP ""
|
||||
#endif
|
||||
|
||||
static int __die(const char *str, int err, struct thread_info *thread,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct task_struct *tsk = thread->task;
|
||||
static int die_counter;
|
||||
int ret;
|
||||
|
||||
pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
|
||||
str, err, ++die_counter);
|
||||
|
||||
/* trap and error numbers are mostly meaningless on ARM */
|
||||
ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
|
||||
if (ret == NOTIFY_STOP)
|
||||
return ret;
|
||||
|
||||
print_modules();
|
||||
__show_regs(regs);
|
||||
pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
|
||||
TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
|
||||
|
||||
if (!user_mode(regs) || in_interrupt()) {
|
||||
dump_mem(KERN_EMERG, "Stack: ", regs->sp,
|
||||
THREAD_SIZE + (unsigned long)task_stack_page(tsk));
|
||||
dump_backtrace(regs, tsk);
|
||||
dump_instr(KERN_EMERG, regs);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static DEFINE_RAW_SPINLOCK(die_lock);
|
||||
|
||||
/*
|
||||
* This function is protected against re-entrancy.
|
||||
*/
|
||||
void die(const char *str, struct pt_regs *regs, int err)
|
||||
{
|
||||
struct thread_info *thread = current_thread_info();
|
||||
int ret;
|
||||
|
||||
oops_enter();
|
||||
|
||||
raw_spin_lock_irq(&die_lock);
|
||||
console_verbose();
|
||||
bust_spinlocks(1);
|
||||
ret = __die(str, err, thread, regs);
|
||||
|
||||
if (regs && kexec_should_crash(thread->task))
|
||||
crash_kexec(regs);
|
||||
|
||||
bust_spinlocks(0);
|
||||
add_taint(TAINT_DIE);
|
||||
raw_spin_unlock_irq(&die_lock);
|
||||
oops_exit();
|
||||
|
||||
if (in_interrupt())
|
||||
panic("Fatal exception in interrupt");
|
||||
if (panic_on_oops)
|
||||
panic("Fatal exception");
|
||||
if (ret != NOTIFY_STOP)
|
||||
do_exit(SIGSEGV);
|
||||
}
|
||||
|
||||
void arm64_notify_die(const char *str, struct pt_regs *regs,
|
||||
struct siginfo *info, int err)
|
||||
{
|
||||
if (user_mode(regs))
|
||||
force_sig_info(info->si_signo, info, current);
|
||||
else
|
||||
die(str, regs, err);
|
||||
}
|
||||
|
||||
asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
|
||||
{
|
||||
siginfo_t info;
|
||||
void __user *pc = (void __user *)instruction_pointer(regs);
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
/* check for AArch32 breakpoint instructions */
|
||||
if (compat_user_mode(regs) && aarch32_break_trap(regs) == 0)
|
||||
return;
|
||||
#endif
|
||||
|
||||
if (show_unhandled_signals) {
|
||||
pr_info("%s[%d]: undefined instruction: pc=%p\n",
|
||||
current->comm, task_pid_nr(current), pc);
|
||||
dump_instr(KERN_INFO, regs);
|
||||
}
|
||||
|
||||
info.si_signo = SIGILL;
|
||||
info.si_errno = 0;
|
||||
info.si_code = ILL_ILLOPC;
|
||||
info.si_addr = pc;
|
||||
|
||||
arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
|
||||
}
|
||||
|
||||
long compat_arm_syscall(struct pt_regs *regs);
|
||||
|
||||
asmlinkage long do_ni_syscall(struct pt_regs *regs)
|
||||
{
|
||||
#ifdef CONFIG_COMPAT
|
||||
long ret;
|
||||
if (is_compat_task()) {
|
||||
ret = compat_arm_syscall(regs);
|
||||
if (ret != -ENOSYS)
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (show_unhandled_signals) {
|
||||
pr_info("%s[%d]: syscall %d\n", current->comm,
|
||||
task_pid_nr(current), (int)regs->syscallno);
|
||||
dump_instr("", regs);
|
||||
if (user_mode(regs))
|
||||
__show_regs(regs);
|
||||
}
|
||||
|
||||
return sys_ni_syscall();
|
||||
}
|
||||
|
||||
/*
|
||||
* bad_mode handles the impossible case in the exception vector.
|
||||
*/
|
||||
asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
|
||||
{
|
||||
console_verbose();
|
||||
|
||||
pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
|
||||
handler[reason], esr);
|
||||
|
||||
die("Oops - bad mode", regs, 0);
|
||||
local_irq_disable();
|
||||
panic("bad mode");
|
||||
}
|
||||
|
||||
void __pte_error(const char *file, int line, unsigned long val)
|
||||
{
|
||||
printk("%s:%d: bad pte %016lx.\n", file, line, val);
|
||||
}
|
||||
|
||||
void __pmd_error(const char *file, int line, unsigned long val)
|
||||
{
|
||||
printk("%s:%d: bad pmd %016lx.\n", file, line, val);
|
||||
}
|
||||
|
||||
void __pgd_error(const char *file, int line, unsigned long val)
|
||||
{
|
||||
printk("%s:%d: bad pgd %016lx.\n", file, line, val);
|
||||
}
|
||||
|
||||
void __init trap_init(void)
|
||||
{
|
||||
return;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user