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)  * unaligned.c: Unaligned load/store trap handling with special
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *              cases for the kernel to do them more quickly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) enum direction {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	load,    /* ld, ldd, ldh, ldsh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	store,   /* st, std, sth, stsh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	both,    /* Swap, ldstub, etc. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	fpload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	fpstore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	invalid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static inline enum direction decode_direction(unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	unsigned long tmp = (insn >> 21) & 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	if(!tmp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		return load;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		if(((insn>>19)&0x3f) == 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			return both;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			return store;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	}
^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) /* 8 = double-word, 4 = word, 2 = half-word */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static inline int decode_access_size(unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	insn = (insn >> 19) & 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if(!insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	else if(insn == 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		return 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	else if(insn == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		printk("Impossible unaligned trap. insn=%08x\n", insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return 4; /* just to keep gcc happy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) /* 0x400000 = signed, 0 = unsigned */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static inline int decode_signedness(unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return (insn & 0x400000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 				       unsigned int rd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if(rs2 >= 16 || rs1 >= 16 || rd >= 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		/* Wheee... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 				     "save %sp, -0x40, %sp\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 				     "restore; restore; restore; restore;\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				     "restore; restore; restore;\n\t");
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) static inline int sign_extend_imm13(int imm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return imm << 19 >> 19;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct reg_window32 *win;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if(reg < 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		return (!reg ? 0 : regs->u_regs[reg]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	/* Ho hum, the slightly complicated case. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return win->locals[reg - 16]; /* yes, I know what this does... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct reg_window32 __user *win;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (reg < 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return (!reg ? 0 : regs->u_regs[reg]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	/* Ho hum, the slightly complicated case. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if ((unsigned long)win & 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (get_user(ret, &win->locals[reg - 16]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static inline unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct reg_window32 *win;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if(reg < 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return &regs->u_regs[reg];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	return &win->locals[reg - 16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static unsigned long compute_effective_address(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 					       unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	unsigned int rs1 = (insn >> 14) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	unsigned int rs2 = insn & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	unsigned int rd = (insn >> 25) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if(insn & 0x2000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		maybe_flush_windows(rs1, 0, rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		maybe_flush_windows(rs1, rs2, rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^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) unsigned long safe_compute_effective_address(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 					     unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	unsigned int rs1 = (insn >> 14) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	unsigned int rs2 = insn & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	unsigned int rd = (insn >> 25) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if(insn & 0x2000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		maybe_flush_windows(rs1, 0, rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		maybe_flush_windows(rs1, rs2, rd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* This is just to make gcc think panic does return... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static void unaligned_panic(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	panic("%s", str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* una_asm.S */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) extern int do_int_load(unsigned long *dest_reg, int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		       unsigned long *saddr, int is_signed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) extern int __do_int_store(unsigned long *dst_addr, int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			  unsigned long *src_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	unsigned long zero[2] = { 0, 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	unsigned long *src_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (reg_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		src_val = fetch_reg_addr(reg_num, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		src_val = &zero[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		if (size == 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 			zero[1] = fetch_reg(1, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return __do_int_store(dst_addr, size, src_val);
^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) extern void smp_capture(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) extern void smp_release(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static inline void advance(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	regs->pc   = regs->npc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	regs->npc += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static inline int floating_point_load_or_store_p(unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return (insn >> 24) & 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static inline int ok_for_kernel(unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	return !floating_point_load_or_store_p(insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	unsigned long g2 = regs->u_regs [UREG_G2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	unsigned long fixup = search_extables_range(regs->pc, &g2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (!fixup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		unsigned long address = compute_effective_address(regs, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)         	if(address < PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)                 	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)         	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)                 	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	        printk(KERN_ALERT " at virtual address %08lx\n",address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			(current->mm ? current->mm->context :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			current->active_mm->context));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			(current->mm ? (unsigned long) current->mm->pgd :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			(unsigned long) current->active_mm->pgd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	        die_if_kernel("Oops", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		/* Not reached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	regs->pc = fixup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	regs->npc = regs->pc + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	regs->u_regs [UREG_G2] = g2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	enum direction dir = decode_direction(insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	int size = decode_access_size(insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if(!ok_for_kernel(insn) || dir == both) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		       regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		unsigned long addr = compute_effective_address(regs, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		switch (dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		case load:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 							 regs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 					  size, (unsigned long *) addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 					  decode_signedness(insn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		case store:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			err = do_int_store(((insn>>25)&0x1f), size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 					   (unsigned long *) addr, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			panic("Impossible kernel unaligned trap.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			/* Not reached... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			kernel_mna_trap_fault(regs, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			advance(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			      enum direction dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	unsigned int reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if ((regs->pc | regs->npc) & 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	/* Must access_ok() in all the necessary places. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) #define WINREG_ADDR(regnum) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	((void __user *)(((unsigned long *)regs->u_regs[UREG_FP])+(regnum)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	reg = (insn >> 25) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (reg >= 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		if (!access_ok(WINREG_ADDR(reg - 16), size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	reg = (insn >> 14) & 0x1f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	if (reg >= 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		if (!access_ok(WINREG_ADDR(reg - 16), size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	if (!(insn & 0x2000)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		reg = (insn & 0x1f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		if (reg >= 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			if (!access_ok(WINREG_ADDR(reg - 16), size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) #undef WINREG_ADDR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	return 0;
^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) static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	send_sig_fault(SIGBUS, BUS_ADRALN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		       (void __user *)safe_compute_effective_address(regs, insn),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		       0, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	enum direction dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	   (((insn >> 30) & 3) != 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		goto kill_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	dir = decode_direction(insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if(!ok_for_user(regs, insn, dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		goto kill_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		int err, size = decode_access_size(insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		if(floating_point_load_or_store_p(insn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			printk("User FPU load/store unaligned unsupported.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			goto kill_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		addr = compute_effective_address(regs, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		switch(dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		case load:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 							 regs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 					  size, (unsigned long *) addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 					  decode_signedness(insn));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		case store:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			err = do_int_store(((insn>>25)&0x1f), size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 					   (unsigned long *) addr, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		case both:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			 * This was supported in 2.4. However, we question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			 * the value of SWAP instruction across word boundaries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			printk("Unaligned SWAP unsupported.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 			err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			unaligned_panic("Impossible user unaligned trap.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			goto kill_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			advance(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) kill_user:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	user_mna_trap_fault(regs, insn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }