diff options
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/traps.h | 6 | ||||
| -rw-r--r-- | arch/arm64/kernel/armv8_deprecated.c | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/traps.c | 21 |
4 files changed, 27 insertions, 10 deletions
diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h index d131501c6222..45e3da34bdc4 100644 --- a/arch/arm64/include/asm/traps.h +++ b/arch/arm64/include/asm/traps.h @@ -37,6 +37,12 @@ void unregister_undef_hook(struct undef_hook *hook); void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr); +/* + * Move regs->pc to next instruction and do necessary setup before it + * is executed. + */ +void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size); + static inline int __in_irqentry_text(unsigned long ptr) { return ptr >= (unsigned long)&__irqentry_text_start && diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c index f0e6d717885b..f6a831b3bd3a 100644 --- a/arch/arm64/kernel/armv8_deprecated.c +++ b/arch/arm64/kernel/armv8_deprecated.c @@ -431,7 +431,7 @@ ret: pr_warn_ratelimited("\"%s\" (%ld) uses obsolete SWP{B} instruction at 0x%llx\n", current->comm, (unsigned long)current->pid, regs->pc); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, 4); return 0; fault: @@ -512,7 +512,7 @@ ret: pr_warn_ratelimited("\"%s\" (%ld) uses deprecated CP15 Barrier instruction at 0x%llx\n", current->comm, (unsigned long)current->pid, regs->pc); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, 4); return 0; } @@ -586,14 +586,14 @@ static int compat_setend_handler(struct pt_regs *regs, u32 big_endian) static int a32_setend_handler(struct pt_regs *regs, u32 instr) { int rc = compat_setend_handler(regs, (instr >> 9) & 1); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, 4); return rc; } static int t16_setend_handler(struct pt_regs *regs, u32 instr) { int rc = compat_setend_handler(regs, (instr >> 3) & 1); - regs->pc += 2; + arm64_skip_faulting_instruction(regs, 2); return rc; } diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 4d9243969702..250e8cfff67d 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1296,7 +1296,7 @@ static int emulate_mrs(struct pt_regs *regs, u32 insn) if (!rc) { dst = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RT, insn); pt_regs_write_reg(regs, dst, val); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); } return rc; diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 5ea4b85aee0e..a1b7d6420d09 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -293,6 +293,17 @@ void arm64_notify_die(const char *str, struct pt_regs *regs, } } +void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size) +{ + regs->pc += size; + + /* + * If we were single stepping, we want to get the step exception after + * we return from the trap. + */ + user_fastforward_single_step(current); +} + static LIST_HEAD(undef_hook); static DEFINE_RAW_SPINLOCK(undef_lock); @@ -480,7 +491,7 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs) if (ret) arm64_notify_segfault(regs, address); else - regs->pc += 4; + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); } static void ctr_read_handler(unsigned int esr, struct pt_regs *regs) @@ -490,7 +501,7 @@ static void ctr_read_handler(unsigned int esr, struct pt_regs *regs) pt_regs_write_reg(regs, rt, val); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); } static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs) @@ -498,7 +509,7 @@ static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs) int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT; pt_regs_write_reg(regs, rt, arch_counter_get_cntvct()); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); } static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs) @@ -506,7 +517,7 @@ static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs) int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT; pt_regs_write_reg(regs, rt, arch_timer_get_rate()); - regs->pc += 4; + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); } struct sys64_hook { @@ -761,7 +772,7 @@ static int bug_handler(struct pt_regs *regs, unsigned int esr) } /* If thread survives, skip over the BUG instruction and continue: */ - regs->pc += AARCH64_INSN_SIZE; /* skip BRK and resume */ + arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE); return DBG_HOOK_HANDLED; } |