Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * arch/sparc/kernel/traps.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright 2000 Jakub Jelinek (jakub@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * I hate traps on the sparc, grrr...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mm_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/oplib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "entry.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) /* #define TRAP_DEBUG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static void instruction_dump(unsigned long *pc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if((((unsigned long) pc) & 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)                 return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	for(i = -3; i < 6; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	static int die_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	/* Amuse the user. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	printk(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) "              \\|/ ____ \\|/\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) "              \"@'/ ,. \\`@\"\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) "              /_| \\__/ |_\\\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) "                 \\__U_/\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	show_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	__SAVE; __SAVE; __SAVE; __SAVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	__SAVE; __SAVE; __SAVE; __SAVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	__RESTORE; __RESTORE; __RESTORE; __RESTORE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/* Stop the back trace when we hit userland or we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		 * find some badly aligned kernel stack. Set an upper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		 * bound in case our stack is trashed and we loop.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		while(rw					&&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		      count++ < 30				&&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)                       (((unsigned long) rw) >= PAGE_OFFSET)	&&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		      !(((unsigned long) rw) & 0x7)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			printk("Caller[%08lx]: %pS\n", rw->ins[7],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			       (void *) rw->ins[7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			rw = (struct reg_window32 *)rw->ins[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	printk("Instruction DUMP:");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	instruction_dump ((unsigned long *) regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if(regs->psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		do_exit(SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	do_exit(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if(type < 0x80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		/* Sun OS's puke from bad traps, Linux survives! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		die_if_kernel("Whee... Hello Mr. Penguin", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	}	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if(regs->psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		die_if_kernel("Kernel bad trap", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	force_sig_fault(SIGILL, ILL_ILLTRP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			(void __user *)regs->pc, type - 0x80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			    unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if(psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		die_if_kernel("Kernel illegal instruction", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #ifdef TRAP_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	printk("Ill instr. at pc=%08lx instruction is %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	       regs->pc, *(unsigned long *)regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			 unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if(psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* XXX User may want to be allowed to do this. XXX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			    unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if(regs->psr & PSR_PS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		       regs->u_regs[UREG_RETPC]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		die_if_kernel("BOGUS", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		/* die_if_kernel("Kernel MNA access", regs); */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #if 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	show_regs (regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	instruction_dump ((unsigned long *) regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	printk ("do_MNA!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	send_sig_fault(SIGBUS, BUS_ADRALN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		       /* FIXME: Should dig out mna address */ (void *)0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		       0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static unsigned long init_fsr = 0x0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)                 { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		  ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		 unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	/* Sanity check... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if(psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	put_psr(get_psr() | PSR_EF);    /* Allow FPU ops. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	regs->psr |= PSR_EF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) #ifndef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if(last_task_used_math == current)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if(last_task_used_math) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		/* Other processes fpu state, save away */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		struct task_struct *fptask = last_task_used_math;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		       &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	last_task_used_math = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if(used_math()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		fpload(&current->thread.float_regs[0], &current->thread.fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		/* Set initial sane state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		fpload(&init_fregs[0], &init_fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		set_used_math();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if(!used_math()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		fpload(&init_fregs[0], &init_fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		set_used_math();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		fpload(&current->thread.float_regs[0], &current->thread.fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	set_thread_flag(TIF_USEDFPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static unsigned long fake_fsr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static unsigned long fake_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		 unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	static int calls;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	unsigned long fsr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	int code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) #ifndef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	struct task_struct *fpt = last_task_used_math;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	struct task_struct *fpt = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	put_psr(get_psr() | PSR_EF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	/* If nobody owns the fpu right now, just clear the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	 * error into our fake static buffer and hope it don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 * happen again.  Thank you crashme...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #ifndef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if(!fpt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		regs->psr &= ~PSR_EF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	       &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) #ifdef DEBUG_FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	switch ((fpt->thread.fsr & 0x1c000)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	/* switch on the contents of the ftt [floating point trap type] field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) #ifdef DEBUG_FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	case (1 << 14):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		printk("IEEE_754_exception\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	case (2 << 14):  /* unfinished_FPop (underflow & co) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	case (3 << 14):  /* unimplemented_FPop (quad stuff, maybe sqrt) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		ret = do_mathemu(regs, fpt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) #ifdef DEBUG_FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	case (4 << 14):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		printk("sequence_error (OS bug...)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	case (5 << 14):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		printk("hardware_error (uhoh!)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	case (6 << 14):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		printk("invalid_fp_register (user error)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) #endif /* DEBUG_FPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	/* If we successfully emulated the FPop, we pretend the trap never happened :-> */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		fpload(&current->thread.float_regs[0], &current->thread.fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	/* nope, better SIGFPE the offending process... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	       
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	clear_tsk_thread_flag(fpt, TIF_USEDFPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if(psr & PSR_PS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		/* The first fsr store/load we tried trapped,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		 * the second one will not (we hope).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		       regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		regs->pc = regs->npc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		regs->npc += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		calls++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		if(calls > 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			die_if_kernel("Too many Penguin-FPU traps from kernel mode",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 				      regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	fsr = fpt->thread.fsr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	code = FPE_FLTUNK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if ((fsr & 0x1c000) == (1 << 14)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (fsr & 0x10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			code = FPE_FLTINV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		else if (fsr & 0x08)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			code = FPE_FLTOVF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		else if (fsr & 0x04)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			code = FPE_FLTUND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		else if (fsr & 0x02)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			code = FPE_FLTDIV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		else if (fsr & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			code = FPE_FLTRES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) #ifndef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	last_task_used_math = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	regs->psr &= ~PSR_EF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if(calls > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		calls=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			 unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	if(psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		die_if_kernel("Penguin overflow trap from kernel mode", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		       unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #ifdef TRAP_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	       pc, npc, psr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if(psr & PSR_PS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		panic("Tell me what a watchpoint trap is, and I'll then deal "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		      "with such a beast...");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		       unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) #ifdef TRAP_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	       pc, npc, psr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 			 unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) #ifdef TRAP_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	       pc, npc, psr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		       unsigned long psr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) #ifdef CONFIG_DEBUG_BUGVERBOSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) void do_BUG(const char *file, int line)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)         // bust_spinlocks(1);   XXX Not in our original BUG()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)         printk("kernel BUG at %s:%d!\n", file, line);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) EXPORT_SYMBOL(do_BUG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /* Since we have our mappings set up, on multiprocessors we can spin them
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)  * up here so that timer interrupts work during initialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) void trap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	extern void thread_info_offsets_are_bolixed_pete(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	/* Force linker to barf if mismatched */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (TI_UWINMASK    != offsetof(struct thread_info, uwinmask) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	    TI_TASK        != offsetof(struct thread_info, task) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	    TI_FLAGS       != offsetof(struct thread_info, flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	    TI_CPU         != offsetof(struct thread_info, cpu) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	    TI_PREEMPT     != offsetof(struct thread_info, preempt_count) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	    TI_SOFTIRQ     != offsetof(struct thread_info, softirq_count) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	    TI_HARDIRQ     != offsetof(struct thread_info, hardirq_count) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	    TI_KSP         != offsetof(struct thread_info, ksp) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	    TI_KPC         != offsetof(struct thread_info, kpc) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	    TI_KPSR        != offsetof(struct thread_info, kpsr) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	    TI_KWIM        != offsetof(struct thread_info, kwim) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	    TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	    TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	    TI_W_SAVED     != offsetof(struct thread_info, w_saved))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		thread_info_offsets_are_bolixed_pete();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	/* Attach to the address space of init_task. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	mmgrab(&init_mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	current->active_mm = &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	/* NOTE: Other cpus have this done as they are started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	 *       up on SMP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }