| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Unaligned memory access handler |
| * |
| * Copyright (C) 2001 Randolph Chung <tausq@debian.org> |
| * Copyright (C) 2022 Helge Deller <deller@gmx.de> |
| * Significantly tweaked by LaMont Jones <lamont@debian.org> |
| */ |
| |
| #include <linux/sched/signal.h> |
| #include <linux/signal.h> |
| #include <linux/ratelimit.h> |
| #include <linux/uaccess.h> |
| #include <asm/hardirq.h> |
| #include <asm/traps.h> |
| |
| /* #define DEBUG_UNALIGNED 1 */ |
| |
| #ifdef DEBUG_UNALIGNED |
| #define DPRINTF(fmt, args...) do { printk(KERN_DEBUG "%s:%d:%s ", __FILE__, __LINE__, __func__ ); printk(KERN_DEBUG fmt, ##args ); } while (0) |
| #else |
| #define DPRINTF(fmt, args...) |
| #endif |
| |
| #define RFMT "%#08lx" |
| |
| /* 1111 1100 0000 0000 0001 0011 1100 0000 */ |
| #define OPCODE1(a,b,c) ((a)<<26|(b)<<12|(c)<<6) |
| #define OPCODE2(a,b) ((a)<<26|(b)<<1) |
| #define OPCODE3(a,b) ((a)<<26|(b)<<2) |
| #define OPCODE4(a) ((a)<<26) |
| #define OPCODE1_MASK OPCODE1(0x3f,1,0xf) |
| #define OPCODE2_MASK OPCODE2(0x3f,1) |
| #define OPCODE3_MASK OPCODE3(0x3f,1) |
| #define OPCODE4_MASK OPCODE4(0x3f) |
| |
| /* skip LDB - never unaligned (index) */ |
| #define OPCODE_LDH_I OPCODE1(0x03,0,0x1) |
| #define OPCODE_LDW_I OPCODE1(0x03,0,0x2) |
| #define OPCODE_LDD_I OPCODE1(0x03,0,0x3) |
| #define OPCODE_LDDA_I OPCODE1(0x03,0,0x4) |
| #define OPCODE_LDCD_I OPCODE1(0x03,0,0x5) |
| #define OPCODE_LDWA_I OPCODE1(0x03,0,0x6) |
| #define OPCODE_LDCW_I OPCODE1(0x03,0,0x7) |
| /* skip LDB - never unaligned (short) */ |
| #define OPCODE_LDH_S OPCODE1(0x03,1,0x1) |
| #define OPCODE_LDW_S OPCODE1(0x03,1,0x2) |
| #define OPCODE_LDD_S OPCODE1(0x03,1,0x3) |
| #define OPCODE_LDDA_S OPCODE1(0x03,1,0x4) |
| #define OPCODE_LDCD_S OPCODE1(0x03,1,0x5) |
| #define OPCODE_LDWA_S OPCODE1(0x03,1,0x6) |
| #define OPCODE_LDCW_S OPCODE1(0x03,1,0x7) |
| /* skip STB - never unaligned */ |
| #define OPCODE_STH OPCODE1(0x03,1,0x9) |
| #define OPCODE_STW OPCODE1(0x03,1,0xa) |
| #define OPCODE_STD OPCODE1(0x03,1,0xb) |
| /* skip STBY - never unaligned */ |
| /* skip STDBY - never unaligned */ |
| #define OPCODE_STWA OPCODE1(0x03,1,0xe) |
| #define OPCODE_STDA OPCODE1(0x03,1,0xf) |
| |
| #define OPCODE_FLDWX OPCODE1(0x09,0,0x0) |
| #define OPCODE_FLDWXR OPCODE1(0x09,0,0x1) |
| #define OPCODE_FSTWX OPCODE1(0x09,0,0x8) |
| #define OPCODE_FSTWXR OPCODE1(0x09,0,0x9) |
| #define OPCODE_FLDWS OPCODE1(0x09,1,0x0) |
| #define OPCODE_FLDWSR OPCODE1(0x09,1,0x1) |
| #define OPCODE_FSTWS OPCODE1(0x09,1,0x8) |
| #define OPCODE_FSTWSR OPCODE1(0x09,1,0x9) |
| #define OPCODE_FLDDX OPCODE1(0x0b,0,0x0) |
| #define OPCODE_FSTDX OPCODE1(0x0b,0,0x8) |
| #define OPCODE_FLDDS OPCODE1(0x0b,1,0x0) |
| #define OPCODE_FSTDS OPCODE1(0x0b,1,0x8) |
| |
| #define OPCODE_LDD_L OPCODE2(0x14,0) |
| #define OPCODE_FLDD_L OPCODE2(0x14,1) |
| #define OPCODE_STD_L OPCODE2(0x1c,0) |
| #define OPCODE_FSTD_L OPCODE2(0x1c,1) |
| |
| #define OPCODE_LDW_M OPCODE3(0x17,1) |
| #define OPCODE_FLDW_L OPCODE3(0x17,0) |
| #define OPCODE_FSTW_L OPCODE3(0x1f,0) |
| #define OPCODE_STW_M OPCODE3(0x1f,1) |
| |
| #define OPCODE_LDH_L OPCODE4(0x11) |
| #define OPCODE_LDW_L OPCODE4(0x12) |
| #define OPCODE_LDWM OPCODE4(0x13) |
| #define OPCODE_STH_L OPCODE4(0x19) |
| #define OPCODE_STW_L OPCODE4(0x1A) |
| #define OPCODE_STWM OPCODE4(0x1B) |
| |
| #define MAJOR_OP(i) (((i)>>26)&0x3f) |
| #define R1(i) (((i)>>21)&0x1f) |
| #define R2(i) (((i)>>16)&0x1f) |
| #define R3(i) ((i)&0x1f) |
| #define FR3(i) ((((i)<<1)&0x1f)|(((i)>>6)&1)) |
| #define IM(i,n) (((i)>>1&((1<<(n-1))-1))|((i)&1?((0-1L)<<(n-1)):0)) |
| #define IM5_2(i) IM((i)>>16,5) |
| #define IM5_3(i) IM((i),5) |
| #define IM14(i) IM((i),14) |
| |
| #define ERR_NOTHANDLED -1 |
| |
| int unaligned_enabled __read_mostly = 1; |
| |
| static int emulate_ldh(struct pt_regs *regs, int toreg) |
| { |
| unsigned long saddr = regs->ior; |
| unsigned long val = 0, temp1; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| DPRINTF("load " RFMT ":" RFMT " to r%d for 2 bytes\n", |
| regs->isr, regs->ior, toreg); |
| |
| __asm__ __volatile__ ( |
| " mtsp %4, %%sr1\n" |
| "1: ldbs 0(%%sr1,%3), %2\n" |
| "2: ldbs 1(%%sr1,%3), %0\n" |
| " depw %2, 23, 24, %0\n" |
| "3: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b) |
| : "+r" (val), "+r" (ret), "=&r" (temp1) |
| : "r" (saddr), "r" (regs->isr) ); |
| |
| DPRINTF("val = " RFMT "\n", val); |
| |
| if (toreg) |
| regs->gr[toreg] = val; |
| |
| return ret; |
| } |
| |
| static int emulate_ldw(struct pt_regs *regs, int toreg, int flop) |
| { |
| unsigned long saddr = regs->ior; |
| unsigned long val = 0, temp1, temp2; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| DPRINTF("load " RFMT ":" RFMT " to r%d for 4 bytes\n", |
| regs->isr, regs->ior, toreg); |
| |
| __asm__ __volatile__ ( |
| " zdep %4,28,2,%2\n" /* r19=(ofs&3)*8 */ |
| " mtsp %5, %%sr1\n" |
| " depw %%r0,31,2,%4\n" |
| "1: ldw 0(%%sr1,%4),%0\n" |
| "2: ldw 4(%%sr1,%4),%3\n" |
| " subi 32,%2,%2\n" |
| " mtctl %2,11\n" |
| " vshd %0,%3,%0\n" |
| "3: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b) |
| : "+r" (val), "+r" (ret), "=&r" (temp1), "=&r" (temp2) |
| : "r" (saddr), "r" (regs->isr) ); |
| |
| DPRINTF("val = " RFMT "\n", val); |
| |
| if (flop) |
| ((__u32*)(regs->fr))[toreg] = val; |
| else if (toreg) |
| regs->gr[toreg] = val; |
| |
| return ret; |
| } |
| static int emulate_ldd(struct pt_regs *regs, int toreg, int flop) |
| { |
| unsigned long saddr = regs->ior; |
| __u64 val = 0; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| DPRINTF("load " RFMT ":" RFMT " to r%d for 8 bytes\n", |
| regs->isr, regs->ior, toreg); |
| |
| if (!IS_ENABLED(CONFIG_64BIT) && !flop) |
| return ERR_NOTHANDLED; |
| |
| #ifdef CONFIG_64BIT |
| __asm__ __volatile__ ( |
| " depd,z %3,60,3,%%r19\n" /* r19=(ofs&7)*8 */ |
| " mtsp %4, %%sr1\n" |
| " depd %%r0,63,3,%3\n" |
| "1: ldd 0(%%sr1,%3),%0\n" |
| "2: ldd 8(%%sr1,%3),%%r20\n" |
| " subi 64,%%r19,%%r19\n" |
| " mtsar %%r19\n" |
| " shrpd %0,%%r20,%%sar,%0\n" |
| "3: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b) |
| : "=r" (val), "+r" (ret) |
| : "0" (val), "r" (saddr), "r" (regs->isr) |
| : "r19", "r20" ); |
| #else |
| { |
| unsigned long shift, temp1; |
| __asm__ __volatile__ ( |
| " zdep %2,29,2,%3\n" /* r19=(ofs&3)*8 */ |
| " mtsp %5, %%sr1\n" |
| " dep %%r0,31,2,%2\n" |
| "1: ldw 0(%%sr1,%2),%0\n" |
| "2: ldw 4(%%sr1,%2),%R0\n" |
| "3: ldw 8(%%sr1,%2),%4\n" |
| " subi 32,%3,%3\n" |
| " mtsar %3\n" |
| " vshd %0,%R0,%0\n" |
| " vshd %R0,%4,%R0\n" |
| "4: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 4b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 4b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 4b) |
| : "+r" (val), "+r" (ret), "+r" (saddr), "=&r" (shift), "=&r" (temp1) |
| : "r" (regs->isr) ); |
| } |
| #endif |
| |
| DPRINTF("val = 0x%llx\n", val); |
| |
| if (flop) |
| regs->fr[toreg] = val; |
| else if (toreg) |
| regs->gr[toreg] = val; |
| |
| return ret; |
| } |
| |
| static int emulate_sth(struct pt_regs *regs, int frreg) |
| { |
| unsigned long val = regs->gr[frreg], temp1; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| if (!frreg) |
| val = 0; |
| |
| DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 2 bytes\n", frreg, |
| val, regs->isr, regs->ior); |
| |
| __asm__ __volatile__ ( |
| " mtsp %4, %%sr1\n" |
| " extrw,u %2, 23, 8, %1\n" |
| "1: stb %1, 0(%%sr1, %3)\n" |
| "2: stb %2, 1(%%sr1, %3)\n" |
| "3: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b) |
| : "+r" (ret), "=&r" (temp1) |
| : "r" (val), "r" (regs->ior), "r" (regs->isr) ); |
| |
| return ret; |
| } |
| |
| static int emulate_stw(struct pt_regs *regs, int frreg, int flop) |
| { |
| unsigned long val; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| if (flop) |
| val = ((__u32*)(regs->fr))[frreg]; |
| else if (frreg) |
| val = regs->gr[frreg]; |
| else |
| val = 0; |
| |
| DPRINTF("store r%d (" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg, |
| val, regs->isr, regs->ior); |
| |
| |
| __asm__ __volatile__ ( |
| " mtsp %3, %%sr1\n" |
| " zdep %2, 28, 2, %%r19\n" |
| " dep %%r0, 31, 2, %2\n" |
| " mtsar %%r19\n" |
| " depwi,z -2, %%sar, 32, %%r19\n" |
| "1: ldw 0(%%sr1,%2),%%r20\n" |
| "2: ldw 4(%%sr1,%2),%%r21\n" |
| " vshd %%r0, %1, %%r22\n" |
| " vshd %1, %%r0, %%r1\n" |
| " and %%r20, %%r19, %%r20\n" |
| " andcm %%r21, %%r19, %%r21\n" |
| " or %%r22, %%r20, %%r20\n" |
| " or %%r1, %%r21, %%r21\n" |
| " stw %%r20,0(%%sr1,%2)\n" |
| " stw %%r21,4(%%sr1,%2)\n" |
| "3: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 3b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 3b) |
| : "+r" (ret) |
| : "r" (val), "r" (regs->ior), "r" (regs->isr) |
| : "r19", "r20", "r21", "r22", "r1" ); |
| |
| return ret; |
| } |
| static int emulate_std(struct pt_regs *regs, int frreg, int flop) |
| { |
| __u64 val; |
| ASM_EXCEPTIONTABLE_VAR(ret); |
| |
| if (flop) |
| val = regs->fr[frreg]; |
| else if (frreg) |
| val = regs->gr[frreg]; |
| else |
| val = 0; |
| |
| DPRINTF("store r%d (0x%016llx) to " RFMT ":" RFMT " for 8 bytes\n", frreg, |
| val, regs->isr, regs->ior); |
| |
| if (!IS_ENABLED(CONFIG_64BIT) && !flop) |
| return ERR_NOTHANDLED; |
| |
| #ifdef CONFIG_64BIT |
| __asm__ __volatile__ ( |
| " mtsp %3, %%sr1\n" |
| " depd,z %2, 60, 3, %%r19\n" |
| " depd %%r0, 63, 3, %2\n" |
| " mtsar %%r19\n" |
| " depdi,z -2, %%sar, 64, %%r19\n" |
| "1: ldd 0(%%sr1,%2),%%r20\n" |
| "2: ldd 8(%%sr1,%2),%%r21\n" |
| " shrpd %%r0, %1, %%sar, %%r22\n" |
| " shrpd %1, %%r0, %%sar, %%r1\n" |
| " and %%r20, %%r19, %%r20\n" |
| " andcm %%r21, %%r19, %%r21\n" |
| " or %%r22, %%r20, %%r20\n" |
| " or %%r1, %%r21, %%r21\n" |
| "3: std %%r20,0(%%sr1,%2)\n" |
| "4: std %%r21,8(%%sr1,%2)\n" |
| "5: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 5b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 5b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 5b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 5b) |
| : "+r" (ret) |
| : "r" (val), "r" (regs->ior), "r" (regs->isr) |
| : "r19", "r20", "r21", "r22", "r1" ); |
| #else |
| { |
| unsigned long valh=(val>>32),vall=(val&0xffffffffl); |
| __asm__ __volatile__ ( |
| " mtsp %4, %%sr1\n" |
| " zdep %2, 29, 2, %%r19\n" |
| " dep %%r0, 31, 2, %3\n" |
| " mtsar %%r19\n" |
| " zvdepi -2, 32, %%r19\n" |
| "1: ldw 0(%%sr1,%3),%%r20\n" |
| "2: ldw 8(%%sr1,%3),%%r21\n" |
| " vshd %1, %2, %%r1\n" |
| " vshd %%r0, %1, %1\n" |
| " vshd %2, %%r0, %2\n" |
| " and %%r20, %%r19, %%r20\n" |
| " andcm %%r21, %%r19, %%r21\n" |
| " or %1, %%r20, %1\n" |
| " or %2, %%r21, %2\n" |
| "3: stw %1,0(%%sr1,%3)\n" |
| "4: stw %%r1,4(%%sr1,%3)\n" |
| "5: stw %2,8(%%sr1,%3)\n" |
| "6: \n" |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(1b, 6b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(2b, 6b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(3b, 6b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(4b, 6b) |
| ASM_EXCEPTIONTABLE_ENTRY_EFAULT(5b, 6b) |
| : "+r" (ret) |
| : "r" (valh), "r" (vall), "r" (regs->ior), "r" (regs->isr) |
| : "r19", "r20", "r21", "r1" ); |
| } |
| #endif |
| |
| return ret; |
| } |
| |
| void handle_unaligned(struct pt_regs *regs) |
| { |
| static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5); |
| unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0; |
| int modify = 0; |
| int ret = ERR_NOTHANDLED; |
| |
| __inc_irq_stat(irq_unaligned_count); |
| |
| /* log a message with pacing */ |
| if (user_mode(regs)) { |
| if (current->thread.flags & PARISC_UAC_SIGBUS) { |
| goto force_sigbus; |
| } |
| |
| if (!(current->thread.flags & PARISC_UAC_NOPRINT) && |
| __ratelimit(&ratelimit)) { |
| printk(KERN_WARNING "%s(%d): unaligned access to " RFMT |
| " at ip " RFMT " (iir " RFMT ")\n", |
| current->comm, task_pid_nr(current), regs->ior, |
| regs->iaoq[0], regs->iir); |
| #ifdef DEBUG_UNALIGNED |
| show_regs(regs); |
| #endif |
| } |
| |
| if (!unaligned_enabled) |
| goto force_sigbus; |
| } |
| |
| /* handle modification - OK, it's ugly, see the instruction manual */ |
| switch (MAJOR_OP(regs->iir)) |
| { |
| case 0x03: |
| case 0x09: |
| case 0x0b: |
| if (regs->iir&0x20) |
| { |
| modify = 1; |
| if (regs->iir&0x1000) /* short loads */ |
| if (regs->iir&0x200) |
| newbase += IM5_3(regs->iir); |
| else |
| newbase += IM5_2(regs->iir); |
| else if (regs->iir&0x2000) /* scaled indexed */ |
| { |
| int shift=0; |
| switch (regs->iir & OPCODE1_MASK) |
| { |
| case OPCODE_LDH_I: |
| shift= 1; break; |
| case OPCODE_LDW_I: |
| shift= 2; break; |
| case OPCODE_LDD_I: |
| case OPCODE_LDDA_I: |
| shift= 3; break; |
| } |
| newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0)<<shift; |
| } else /* simple indexed */ |
| newbase += (R2(regs->iir)?regs->gr[R2(regs->iir)]:0); |
| } |
| break; |
| case 0x13: |
| case 0x1b: |
| modify = 1; |
| newbase += IM14(regs->iir); |
| break; |
| case 0x14: |
| case 0x1c: |
| if (regs->iir&8) |
| { |
| modify = 1; |
| newbase += IM14(regs->iir&~0xe); |
| } |
| break; |
| case 0x16: |
| case 0x1e: |
| modify = 1; |
| newbase += IM14(regs->iir&6); |
| break; |
| case 0x17: |
| case 0x1f: |
| if (regs->iir&4) |
| { |
| modify = 1; |
| newbase += IM14(regs->iir&~4); |
| } |
| break; |
| } |
| |
| /* TODO: make this cleaner... */ |
| switch (regs->iir & OPCODE1_MASK) |
| { |
| case OPCODE_LDH_I: |
| case OPCODE_LDH_S: |
| ret = emulate_ldh(regs, R3(regs->iir)); |
| break; |
| |
| case OPCODE_LDW_I: |
| case OPCODE_LDWA_I: |
| case OPCODE_LDW_S: |
| case OPCODE_LDWA_S: |
| ret = emulate_ldw(regs, R3(regs->iir),0); |
| break; |
| |
| case OPCODE_STH: |
| ret = emulate_sth(regs, R2(regs->iir)); |
| break; |
| |
| case OPCODE_STW: |
| case OPCODE_STWA: |
| ret = emulate_stw(regs, R2(regs->iir),0); |
| break; |
| |
| #ifdef CONFIG_64BIT |
| case OPCODE_LDD_I: |
| case OPCODE_LDDA_I: |
| case OPCODE_LDD_S: |
| case OPCODE_LDDA_S: |
| ret = emulate_ldd(regs, R3(regs->iir),0); |
| break; |
| |
| case OPCODE_STD: |
| case OPCODE_STDA: |
| ret = emulate_std(regs, R2(regs->iir),0); |
| break; |
| #endif |
| |
| case OPCODE_FLDWX: |
| case OPCODE_FLDWS: |
| case OPCODE_FLDWXR: |
| case OPCODE_FLDWSR: |
| ret = emulate_ldw(regs,FR3(regs->iir),1); |
| break; |
| |
| case OPCODE_FLDDX: |
| case OPCODE_FLDDS: |
| ret = emulate_ldd(regs,R3(regs->iir),1); |
| break; |
| |
| case OPCODE_FSTWX: |
| case OPCODE_FSTWS: |
| case OPCODE_FSTWXR: |
| case OPCODE_FSTWSR: |
| ret = emulate_stw(regs,FR3(regs->iir),1); |
| break; |
| |
| case OPCODE_FSTDX: |
| case OPCODE_FSTDS: |
| ret = emulate_std(regs,R3(regs->iir),1); |
| break; |
| |
| case OPCODE_LDCD_I: |
| case OPCODE_LDCW_I: |
| case OPCODE_LDCD_S: |
| case OPCODE_LDCW_S: |
| ret = ERR_NOTHANDLED; /* "undefined", but lets kill them. */ |
| break; |
| } |
| switch (regs->iir & OPCODE2_MASK) |
| { |
| case OPCODE_FLDD_L: |
| ret = emulate_ldd(regs,R2(regs->iir),1); |
| break; |
| case OPCODE_FSTD_L: |
| ret = emulate_std(regs, R2(regs->iir),1); |
| break; |
| #ifdef CONFIG_64BIT |
| case OPCODE_LDD_L: |
| ret = emulate_ldd(regs, R2(regs->iir),0); |
| break; |
| case OPCODE_STD_L: |
| ret = emulate_std(regs, R2(regs->iir),0); |
| break; |
| #endif |
| } |
| switch (regs->iir & OPCODE3_MASK) |
| { |
| case OPCODE_FLDW_L: |
| ret = emulate_ldw(regs, R2(regs->iir), 1); |
| break; |
| case OPCODE_LDW_M: |
| ret = emulate_ldw(regs, R2(regs->iir), 0); |
| break; |
| |
| case OPCODE_FSTW_L: |
| ret = emulate_stw(regs, R2(regs->iir),1); |
| break; |
| case OPCODE_STW_M: |
| ret = emulate_stw(regs, R2(regs->iir),0); |
| break; |
| } |
| switch (regs->iir & OPCODE4_MASK) |
| { |
| case OPCODE_LDH_L: |
| ret = emulate_ldh(regs, R2(regs->iir)); |
| break; |
| case OPCODE_LDW_L: |
| case OPCODE_LDWM: |
| ret = emulate_ldw(regs, R2(regs->iir),0); |
| break; |
| case OPCODE_STH_L: |
| ret = emulate_sth(regs, R2(regs->iir)); |
| break; |
| case OPCODE_STW_L: |
| case OPCODE_STWM: |
| ret = emulate_stw(regs, R2(regs->iir),0); |
| break; |
| } |
| |
| if (ret == 0 && modify && R1(regs->iir)) |
| regs->gr[R1(regs->iir)] = newbase; |
| |
| |
| if (ret == ERR_NOTHANDLED) |
| printk(KERN_CRIT "Not-handled unaligned insn 0x%08lx\n", regs->iir); |
| |
| DPRINTF("ret = %d\n", ret); |
| |
| if (ret) |
| { |
| /* |
| * The unaligned handler failed. |
| * If we were called by __get_user() or __put_user() jump |
| * to it's exception fixup handler instead of crashing. |
| */ |
| if (!user_mode(regs) && fixup_exception(regs)) |
| return; |
| |
| printk(KERN_CRIT "Unaligned handler failed, ret = %d\n", ret); |
| die_if_kernel("Unaligned data reference", regs, 28); |
| |
| if (ret == -EFAULT) |
| { |
| force_sig_fault(SIGSEGV, SEGV_MAPERR, |
| (void __user *)regs->ior); |
| } |
| else |
| { |
| force_sigbus: |
| /* couldn't handle it ... */ |
| force_sig_fault(SIGBUS, BUS_ADRALN, |
| (void __user *)regs->ior); |
| } |
| |
| return; |
| } |
| |
| /* else we handled it, let life go on. */ |
| regs->gr[0]|=PSW_N; |
| } |
| |
| /* |
| * NB: check_unaligned() is only used for PCXS processors right |
| * now, so we only check for PA1.1 encodings at this point. |
| */ |
| |
| int |
| check_unaligned(struct pt_regs *regs) |
| { |
| unsigned long align_mask; |
| |
| /* Get alignment mask */ |
| |
| align_mask = 0UL; |
| switch (regs->iir & OPCODE1_MASK) { |
| |
| case OPCODE_LDH_I: |
| case OPCODE_LDH_S: |
| case OPCODE_STH: |
| align_mask = 1UL; |
| break; |
| |
| case OPCODE_LDW_I: |
| case OPCODE_LDWA_I: |
| case OPCODE_LDW_S: |
| case OPCODE_LDWA_S: |
| case OPCODE_STW: |
| case OPCODE_STWA: |
| align_mask = 3UL; |
| break; |
| |
| default: |
| switch (regs->iir & OPCODE4_MASK) { |
| case OPCODE_LDH_L: |
| case OPCODE_STH_L: |
| align_mask = 1UL; |
| break; |
| case OPCODE_LDW_L: |
| case OPCODE_LDWM: |
| case OPCODE_STW_L: |
| case OPCODE_STWM: |
| align_mask = 3UL; |
| break; |
| } |
| break; |
| } |
| |
| return (int)(regs->ior & align_mask); |
| } |
| |
