| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Matthew Wilcox | 1958 | 87.02% | 9 | 21.43% |
| Helge Deller | 122 | 5.42% | 14 | 33.33% |
| Linus Torvalds (pre-git) | 110 | 4.89% | 11 | 26.19% |
| Kyle McMartin | 26 | 1.16% | 1 | 2.38% |
| Akinobu Mita | 19 | 0.84% | 1 | 2.38% |
| Eric W. Biedermann | 8 | 0.36% | 1 | 2.38% |
| Alexey Dobriyan | 3 | 0.13% | 1 | 2.38% |
| Harvey Harrison | 1 | 0.04% | 1 | 2.38% |
| Ingo Molnar | 1 | 0.04% | 1 | 2.38% |
| Thomas Gleixner | 1 | 0.04% | 1 | 2.38% |
| Linus Torvalds | 1 | 0.04% | 1 | 2.38% |
| Total | 2250 | 42 |
// 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)&0x1f)<<1)|(((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); }
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