From: Ralf Baechle Date: Tue, 28 Jul 2015 18:37:43 +0000 (+0200) Subject: MIPS: Set trap_no field in thread_struct on exception. X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e3b28831c18c6c95c51b6bb717fa116d2b658ba9;p=openwrt%2Fstaging%2Fblogic.git MIPS: Set trap_no field in thread_struct on exception. This reverts commit 7281cd22973008a782860e48ed8d85d00204168c and adds actual functionality to use the field. --- diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h index 9b3b48e21c22..59ee6dcf6eed 100644 --- a/arch/mips/include/asm/processor.h +++ b/arch/mips/include/asm/processor.h @@ -275,6 +275,7 @@ struct thread_struct { unsigned long cp0_badvaddr; /* Last user fault */ unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */ unsigned long error_code; + unsigned long trap_nr; #ifdef CONFIG_CPU_CAVIUM_OCTEON struct octeon_cop2_state cp2 __attribute__ ((__aligned__(128))); struct octeon_cvmseg_state cvmseg __attribute__ ((__aligned__(128))); @@ -341,6 +342,7 @@ struct thread_struct { .cp0_badvaddr = 0, \ .cp0_baduaddr = 0, \ .error_code = 0, \ + .trap_nr = 0, \ /* \ * Platform specific cop2 registers(null if no COP2) \ */ \ diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c index 3706091b6351..154e2039ea5e 100644 --- a/arch/mips/kernel/asm-offsets.c +++ b/arch/mips/kernel/asm-offsets.c @@ -128,6 +128,7 @@ void output_thread_defines(void) thread.cp0_baduaddr); OFFSET(THREAD_ECODE, task_struct, \ thread.error_code); + OFFSET(THREAD_TRAPNO, task_struct, thread.trap_nr); BLANK(); } diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index da0b3189fe88..cea964daf400 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -370,11 +370,6 @@ void show_registers(struct pt_regs *regs) set_fs(old_fs); } -static int regs_to_trapnr(struct pt_regs *regs) -{ - return (regs->cp0_cause >> 2) & 0x1f; -} - static DEFINE_RAW_SPINLOCK(die_lock); void __noreturn die(const char *str, struct pt_regs *regs) @@ -384,7 +379,7 @@ void __noreturn die(const char *str, struct pt_regs *regs) oops_enter(); - if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs), + if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP) sig = 0; @@ -470,7 +465,7 @@ asmlinkage void do_be(struct pt_regs *regs) printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", data ? "Data" : "Instruction", field, regs->cp0_epc, field, regs->regs[31]); - if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), + if (notify_die(DIE_OOPS, "bus error", regs, 0, current->thread.trap_nr, SIGBUS) == NOTIFY_STOP) goto out; @@ -826,7 +821,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) int sig; prev_state = exception_enter(); - if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), + if (notify_die(DIE_FP, "FP exception", regs, 0, current->thread.trap_nr, SIGFPE) == NOTIFY_STOP) goto out; @@ -882,11 +877,12 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code, char b[40]; #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP - if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) + if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr, + SIGTRAP) == NOTIFY_STOP) return; #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ - if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), + if (notify_die(DIE_TRAP, str, regs, code, current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) return; @@ -948,6 +944,7 @@ asmlinkage void do_bp(struct pt_regs *regs) set_fs(KERNEL_DS); prev_state = exception_enter(); + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; if (get_isa16_mode(regs->cp0_epc)) { u16 instr[2]; @@ -989,13 +986,13 @@ asmlinkage void do_bp(struct pt_regs *regs) switch (bcode) { case BRK_KPROBE_BP: if (notify_die(DIE_BREAK, "debug", regs, bcode, - regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) + current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) goto out; else break; case BRK_KPROBE_SSTEPBP: if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, - regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) + current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP) goto out; else break; @@ -1028,6 +1025,7 @@ asmlinkage void do_tr(struct pt_regs *regs) set_fs(get_ds()); prev_state = exception_enter(); + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; if (get_isa16_mode(regs->cp0_epc)) { if (__get_user(instr[0], (u16 __user *)(epc + 0)) || __get_user(instr[1], (u16 __user *)(epc + 2))) @@ -1094,8 +1092,9 @@ asmlinkage void do_ri(struct pt_regs *regs) no_r2_instr: prev_state = exception_enter(); + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; - if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), + if (notify_die(DIE_RI, "RI Fault", regs, 0, current->thread.trap_nr, SIGILL) == NOTIFY_STOP) goto out; @@ -1444,8 +1443,9 @@ asmlinkage void do_msa_fpe(struct pt_regs *regs, unsigned int msacsr) enum ctx_state prev_state; prev_state = exception_enter(); + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; if (notify_die(DIE_MSAFP, "MSA FP exception", regs, 0, - regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP) + current->thread.trap_nr, SIGFPE) == NOTIFY_STOP) goto out; /* Clear MSACSR.Cause before enabling interrupts */ diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c index 852a41c6da45..4b88fa031891 100644 --- a/arch/mips/mm/fault.c +++ b/arch/mips/mm/fault.c @@ -57,12 +57,10 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write, #ifdef CONFIG_KPROBES /* - * This is to notify the fault handler of the kprobes. The - * exception code is redundant as it is also carried in REGS, - * but we pass it anyhow. + * This is to notify the fault handler of the kprobes. */ if (notify_die(DIE_PAGE_FAULT, "page fault", regs, -1, - (regs->cp0_cause >> 2) & 0x1f, SIGSEGV) == NOTIFY_STOP) + current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP) return; #endif @@ -224,6 +222,7 @@ bad_area_nosemaphore: print_vma_addr(" ", regs->regs[31]); pr_info("\n"); } + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; info.si_signo = SIGSEGV; info.si_errno = 0; /* info.si_code has been set above */ @@ -282,6 +281,7 @@ do_sigbus: field, (unsigned long) regs->cp0_epc, field, (unsigned long) regs->regs[31]); #endif + current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f; tsk->thread.cp0_badvaddr = address; info.si_signo = SIGBUS; info.si_errno = 0;