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396 lines
11 KiB
396 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sparc/kernel/traps.c |
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* |
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* Copyright 1995, 2008 David S. Miller ([email protected]) |
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* Copyright 2000 Jakub Jelinek ([email protected]) |
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*/ |
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/* |
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* I hate traps on the sparc, grrr... |
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*/ |
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#include <linux/sched/mm.h> |
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#include <linux/sched/debug.h> |
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#include <linux/mm_types.h> |
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#include <linux/kernel.h> |
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#include <linux/signal.h> |
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#include <linux/smp.h> |
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#include <linux/kdebug.h> |
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#include <linux/export.h> |
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#include <linux/pgtable.h> |
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#include <asm/delay.h> |
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#include <asm/ptrace.h> |
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#include <asm/oplib.h> |
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#include <asm/page.h> |
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#include <asm/unistd.h> |
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#include <asm/traps.h> |
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#include "entry.h" |
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#include "kernel.h" |
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/* #define TRAP_DEBUG */ |
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static void instruction_dump(unsigned long *pc) |
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{ |
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int i; |
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if((((unsigned long) pc) & 3)) |
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return; |
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for(i = -3; i < 6; i++) |
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printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>'); |
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printk("\n"); |
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} |
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#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") |
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#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") |
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void __noreturn die_if_kernel(char *str, struct pt_regs *regs) |
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{ |
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static int die_counter; |
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int count = 0; |
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/* Amuse the user. */ |
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printk( |
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" \\|/ ____ \\|/\n" |
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" \"@'/ ,. \\`@\"\n" |
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" /_| \\__/ |_\\\n" |
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" \\__U_/\n"); |
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printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter); |
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show_regs(regs); |
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
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__SAVE; __SAVE; __SAVE; __SAVE; |
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__SAVE; __SAVE; __SAVE; __SAVE; |
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__RESTORE; __RESTORE; __RESTORE; __RESTORE; |
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__RESTORE; __RESTORE; __RESTORE; __RESTORE; |
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{ |
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struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP]; |
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/* Stop the back trace when we hit userland or we |
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* find some badly aligned kernel stack. Set an upper |
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* bound in case our stack is trashed and we loop. |
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*/ |
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while(rw && |
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count++ < 30 && |
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(((unsigned long) rw) >= PAGE_OFFSET) && |
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!(((unsigned long) rw) & 0x7)) { |
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printk("Caller[%08lx]: %pS\n", rw->ins[7], |
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(void *) rw->ins[7]); |
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rw = (struct reg_window32 *)rw->ins[6]; |
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} |
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} |
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printk("Instruction DUMP:"); |
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instruction_dump ((unsigned long *) regs->pc); |
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if(regs->psr & PSR_PS) |
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do_exit(SIGKILL); |
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do_exit(SIGSEGV); |
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} |
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void do_hw_interrupt(struct pt_regs *regs, unsigned long type) |
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{ |
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if(type < 0x80) { |
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/* Sun OS's puke from bad traps, Linux survives! */ |
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printk("Unimplemented Sparc TRAP, type = %02lx\n", type); |
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die_if_kernel("Whee... Hello Mr. Penguin", regs); |
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} |
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if(regs->psr & PSR_PS) |
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die_if_kernel("Kernel bad trap", regs); |
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force_sig_fault(SIGILL, ILL_ILLTRP, |
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(void __user *)regs->pc, type - 0x80); |
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} |
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void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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if(psr & PSR_PS) |
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die_if_kernel("Kernel illegal instruction", regs); |
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#ifdef TRAP_DEBUG |
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printk("Ill instr. at pc=%08lx instruction is %08lx\n", |
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regs->pc, *(unsigned long *)regs->pc); |
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#endif |
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send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current); |
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} |
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void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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if(psr & PSR_PS) |
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die_if_kernel("Penguin instruction from Penguin mode??!?!", regs); |
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send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current); |
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} |
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/* XXX User may want to be allowed to do this. XXX */ |
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void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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if(regs->psr & PSR_PS) { |
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printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc, |
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regs->u_regs[UREG_RETPC]); |
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die_if_kernel("BOGUS", regs); |
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/* die_if_kernel("Kernel MNA access", regs); */ |
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} |
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#if 0 |
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show_regs (regs); |
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instruction_dump ((unsigned long *) regs->pc); |
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printk ("do_MNA!\n"); |
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#endif |
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send_sig_fault(SIGBUS, BUS_ADRALN, |
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/* FIXME: Should dig out mna address */ (void *)0, |
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0, current); |
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} |
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static unsigned long init_fsr = 0x0UL; |
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static unsigned long init_fregs[32] __attribute__ ((aligned (8))) = |
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{ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, |
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~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, |
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~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, |
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~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL }; |
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void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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/* Sanity check... */ |
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if(psr & PSR_PS) |
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die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs); |
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put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */ |
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regs->psr |= PSR_EF; |
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#ifndef CONFIG_SMP |
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if(last_task_used_math == current) |
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return; |
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if(last_task_used_math) { |
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/* Other processes fpu state, save away */ |
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struct task_struct *fptask = last_task_used_math; |
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fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr, |
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&fptask->thread.fpqueue[0], &fptask->thread.fpqdepth); |
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} |
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last_task_used_math = current; |
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if(used_math()) { |
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fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); |
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} else { |
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/* Set initial sane state. */ |
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fpload(&init_fregs[0], &init_fsr); |
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set_used_math(); |
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} |
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#else |
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if(!used_math()) { |
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fpload(&init_fregs[0], &init_fsr); |
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set_used_math(); |
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} else { |
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fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); |
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} |
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set_thread_flag(TIF_USEDFPU); |
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#endif |
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} |
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static unsigned long fake_regs[32] __attribute__ ((aligned (8))); |
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static unsigned long fake_fsr; |
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static unsigned long fake_queue[32] __attribute__ ((aligned (8))); |
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static unsigned long fake_depth; |
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void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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static int calls; |
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unsigned long fsr; |
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int ret = 0; |
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int code; |
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#ifndef CONFIG_SMP |
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struct task_struct *fpt = last_task_used_math; |
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#else |
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struct task_struct *fpt = current; |
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#endif |
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put_psr(get_psr() | PSR_EF); |
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/* If nobody owns the fpu right now, just clear the |
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* error into our fake static buffer and hope it don't |
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* happen again. Thank you crashme... |
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*/ |
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#ifndef CONFIG_SMP |
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if(!fpt) { |
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#else |
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if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) { |
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#endif |
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fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth); |
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regs->psr &= ~PSR_EF; |
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return; |
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} |
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fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr, |
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&fpt->thread.fpqueue[0], &fpt->thread.fpqdepth); |
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#ifdef DEBUG_FPU |
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printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr); |
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#endif |
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switch ((fpt->thread.fsr & 0x1c000)) { |
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/* switch on the contents of the ftt [floating point trap type] field */ |
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#ifdef DEBUG_FPU |
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case (1 << 14): |
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printk("IEEE_754_exception\n"); |
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break; |
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#endif |
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case (2 << 14): /* unfinished_FPop (underflow & co) */ |
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case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */ |
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ret = do_mathemu(regs, fpt); |
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break; |
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#ifdef DEBUG_FPU |
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case (4 << 14): |
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printk("sequence_error (OS bug...)\n"); |
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break; |
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case (5 << 14): |
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printk("hardware_error (uhoh!)\n"); |
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break; |
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case (6 << 14): |
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printk("invalid_fp_register (user error)\n"); |
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break; |
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#endif /* DEBUG_FPU */ |
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} |
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/* If we successfully emulated the FPop, we pretend the trap never happened :-> */ |
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if (ret) { |
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fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); |
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return; |
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} |
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/* nope, better SIGFPE the offending process... */ |
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#ifdef CONFIG_SMP |
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clear_tsk_thread_flag(fpt, TIF_USEDFPU); |
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#endif |
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if(psr & PSR_PS) { |
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/* The first fsr store/load we tried trapped, |
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* the second one will not (we hope). |
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*/ |
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printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n", |
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regs->pc); |
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regs->pc = regs->npc; |
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regs->npc += 4; |
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calls++; |
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if(calls > 2) |
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die_if_kernel("Too many Penguin-FPU traps from kernel mode", |
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regs); |
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return; |
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} |
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fsr = fpt->thread.fsr; |
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code = FPE_FLTUNK; |
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if ((fsr & 0x1c000) == (1 << 14)) { |
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if (fsr & 0x10) |
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code = FPE_FLTINV; |
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else if (fsr & 0x08) |
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code = FPE_FLTOVF; |
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else if (fsr & 0x04) |
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code = FPE_FLTUND; |
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else if (fsr & 0x02) |
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code = FPE_FLTDIV; |
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else if (fsr & 0x01) |
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code = FPE_FLTRES; |
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} |
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send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt); |
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#ifndef CONFIG_SMP |
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last_task_used_math = NULL; |
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#endif |
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regs->psr &= ~PSR_EF; |
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if(calls > 0) |
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calls=0; |
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} |
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void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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if(psr & PSR_PS) |
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die_if_kernel("Penguin overflow trap from kernel mode", regs); |
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send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current); |
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} |
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void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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#ifdef TRAP_DEBUG |
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printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n", |
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pc, npc, psr); |
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#endif |
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if(psr & PSR_PS) |
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panic("Tell me what a watchpoint trap is, and I'll then deal " |
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"with such a beast..."); |
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} |
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void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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#ifdef TRAP_DEBUG |
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printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n", |
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pc, npc, psr); |
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#endif |
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force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0); |
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} |
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void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current); |
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} |
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void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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#ifdef TRAP_DEBUG |
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printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n", |
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pc, npc, psr); |
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#endif |
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send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current); |
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} |
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void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
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unsigned long psr) |
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{ |
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send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current); |
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} |
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#ifdef CONFIG_DEBUG_BUGVERBOSE |
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void do_BUG(const char *file, int line) |
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{ |
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// bust_spinlocks(1); XXX Not in our original BUG() |
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printk("kernel BUG at %s:%d!\n", file, line); |
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} |
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EXPORT_SYMBOL(do_BUG); |
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#endif |
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/* Since we have our mappings set up, on multiprocessors we can spin them |
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* up here so that timer interrupts work during initialization. |
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*/ |
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void trap_init(void) |
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{ |
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extern void thread_info_offsets_are_bolixed_pete(void); |
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/* Force linker to barf if mismatched */ |
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if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) || |
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TI_TASK != offsetof(struct thread_info, task) || |
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TI_FLAGS != offsetof(struct thread_info, flags) || |
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TI_CPU != offsetof(struct thread_info, cpu) || |
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TI_PREEMPT != offsetof(struct thread_info, preempt_count) || |
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TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) || |
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TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) || |
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TI_KSP != offsetof(struct thread_info, ksp) || |
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TI_KPC != offsetof(struct thread_info, kpc) || |
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TI_KPSR != offsetof(struct thread_info, kpsr) || |
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TI_KWIM != offsetof(struct thread_info, kwim) || |
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TI_REG_WINDOW != offsetof(struct thread_info, reg_window) || |
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TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) || |
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TI_W_SAVED != offsetof(struct thread_info, w_saved)) |
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thread_info_offsets_are_bolixed_pete(); |
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/* Attach to the address space of init_task. */ |
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mmgrab(&init_mm); |
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current->active_mm = &init_mm; |
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/* NOTE: Other cpus have this done as they are started |
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* up on SMP. |
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*/ |
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}
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