| /* |
| * Handle unaligned accesses by emulation. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1996, 1998, 1999, 2002 by Ralf Baechle |
| * Copyright (C) 1999 Silicon Graphics, Inc. |
| * Copyright (C) 2014 Imagination Technologies Ltd. |
| * |
| * This file contains exception handler for address error exception with the |
| * special capability to execute faulting instructions in software. The |
| * handler does not try to handle the case when the program counter points |
| * to an address not aligned to a word boundary. |
| * |
| * Putting data to unaligned addresses is a bad practice even on Intel where |
| * only the performance is affected. Much worse is that such code is non- |
| * portable. Due to several programs that die on MIPS due to alignment |
| * problems I decided to implement this handler anyway though I originally |
| * didn't intend to do this at all for user code. |
| * |
| * For now I enable fixing of address errors by default to make life easier. |
| * I however intend to disable this somewhen in the future when the alignment |
| * problems with user programs have been fixed. For programmers this is the |
| * right way to go. |
| * |
| * Fixing address errors is a per process option. The option is inherited |
| * across fork(2) and execve(2) calls. If you really want to use the |
| * option in your user programs - I discourage the use of the software |
| * emulation strongly - use the following code in your userland stuff: |
| * |
| * #include <sys/sysmips.h> |
| * |
| * ... |
| * sysmips(MIPS_FIXADE, x); |
| * ... |
| * |
| * The argument x is 0 for disabling software emulation, enabled otherwise. |
| * |
| * Below a little program to play around with this feature. |
| * |
| * #include <stdio.h> |
| * #include <sys/sysmips.h> |
| * |
| * struct foo { |
| * unsigned char bar[8]; |
| * }; |
| * |
| * main(int argc, char *argv[]) |
| * { |
| * struct foo x = {0, 1, 2, 3, 4, 5, 6, 7}; |
| * unsigned int *p = (unsigned int *) (x.bar + 3); |
| * int i; |
| * |
| * if (argc > 1) |
| * sysmips(MIPS_FIXADE, atoi(argv[1])); |
| * |
| * printf("*p = %08lx\n", *p); |
| * |
| * *p = 0xdeadface; |
| * |
| * for(i = 0; i <= 7; i++) |
| * printf("%02x ", x.bar[i]); |
| * printf("\n"); |
| * } |
| * |
| * Coprocessor loads are not supported; I think this case is unimportant |
| * in the practice. |
| * |
| * TODO: Handle ndc (attempted store to doubleword in uncached memory) |
| * exception for the R6000. |
| * A store crossing a page boundary might be executed only partially. |
| * Undo the partial store in this case. |
| */ |
| #include <linux/context_tracking.h> |
| #include <linux/mm.h> |
| #include <linux/signal.h> |
| #include <linux/smp.h> |
| #include <linux/sched.h> |
| #include <linux/debugfs.h> |
| #include <linux/perf_event.h> |
| |
| #include <asm/asm.h> |
| #include <asm/branch.h> |
| #include <asm/byteorder.h> |
| #include <asm/cop2.h> |
| #include <asm/fpu.h> |
| #include <asm/fpu_emulator.h> |
| #include <asm/inst.h> |
| #include <asm/uaccess.h> |
| #include <asm/fpu.h> |
| #include <asm/fpu_emulator.h> |
| |
| #define STR(x) __STR(x) |
| #define __STR(x) #x |
| |
| enum { |
| UNALIGNED_ACTION_QUIET, |
| UNALIGNED_ACTION_SIGNAL, |
| UNALIGNED_ACTION_SHOW, |
| }; |
| #ifdef CONFIG_DEBUG_FS |
| static u32 unaligned_instructions; |
| static u32 unaligned_action; |
| #else |
| #define unaligned_action UNALIGNED_ACTION_QUIET |
| #endif |
| extern void show_registers(struct pt_regs *regs); |
| |
| #ifdef __BIG_ENDIAN |
| #define LoadHW(addr, value, res) \ |
| __asm__ __volatile__ (".set\tnoat\n" \ |
| "1:\t"user_lb("%0", "0(%2)")"\n" \ |
| "2:\t"user_lbu("$1", "1(%2)")"\n\t" \ |
| "sll\t%0, 0x8\n\t" \ |
| "or\t%0, $1\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\t.set\tat\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_lwl("%0", "(%2)")"\n" \ |
| "2:\t"user_lwr("%0", "3(%2)")"\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadHWU(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| ".set\tnoat\n" \ |
| "1:\t"user_lbu("%0", "0(%2)")"\n" \ |
| "2:\t"user_lbu("$1", "1(%2)")"\n\t" \ |
| "sll\t%0, 0x8\n\t" \ |
| "or\t%0, $1\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".set\tat\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadWU(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_lwl("%0", "(%2)")"\n" \ |
| "2:\t"user_lwr("%0", "3(%2)")"\n\t" \ |
| "dsll\t%0, %0, 32\n\t" \ |
| "dsrl\t%0, %0, 32\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| "\t.section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadDW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\tldl\t%0, (%2)\n" \ |
| "2:\tldr\t%0, 7(%2)\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| "\t.section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreHW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| ".set\tnoat\n" \ |
| "1:\t"user_sb("%1", "1(%2)")"\n" \ |
| "srl\t$1, %1, 0x8\n" \ |
| "2:\t"user_sb("$1", "0(%2)")"\n" \ |
| ".set\tat\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_swl("%1", "(%2)")"\n" \ |
| "2:\t"user_swr("%1", "3(%2)")"\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreDW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\tsdl\t%1,(%2)\n" \ |
| "2:\tsdr\t%1, 7(%2)\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| #endif |
| |
| #ifdef __LITTLE_ENDIAN |
| #define LoadHW(addr, value, res) \ |
| __asm__ __volatile__ (".set\tnoat\n" \ |
| "1:\t"user_lb("%0", "1(%2)")"\n" \ |
| "2:\t"user_lbu("$1", "0(%2)")"\n\t" \ |
| "sll\t%0, 0x8\n\t" \ |
| "or\t%0, $1\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\t.set\tat\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_lwl("%0", "3(%2)")"\n" \ |
| "2:\t"user_lwr("%0", "(%2)")"\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadHWU(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| ".set\tnoat\n" \ |
| "1:\t"user_lbu("%0", "1(%2)")"\n" \ |
| "2:\t"user_lbu("$1", "0(%2)")"\n\t" \ |
| "sll\t%0, 0x8\n\t" \ |
| "or\t%0, $1\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".set\tat\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadWU(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_lwl("%0", "3(%2)")"\n" \ |
| "2:\t"user_lwr("%0", "(%2)")"\n\t" \ |
| "dsll\t%0, %0, 32\n\t" \ |
| "dsrl\t%0, %0, 32\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| "\t.section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define LoadDW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\tldl\t%0, 7(%2)\n" \ |
| "2:\tldr\t%0, (%2)\n\t" \ |
| "li\t%1, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| "\t.section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%1, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=&r" (value), "=r" (res) \ |
| : "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreHW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| ".set\tnoat\n" \ |
| "1:\t"user_sb("%1", "0(%2)")"\n" \ |
| "srl\t$1,%1, 0x8\n" \ |
| "2:\t"user_sb("$1", "1(%2)")"\n" \ |
| ".set\tat\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\t"user_swl("%1", "3(%2)")"\n" \ |
| "2:\t"user_swr("%1", "(%2)")"\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| |
| #define StoreDW(addr, value, res) \ |
| __asm__ __volatile__ ( \ |
| "1:\tsdl\t%1, 7(%2)\n" \ |
| "2:\tsdr\t%1, (%2)\n\t" \ |
| "li\t%0, 0\n" \ |
| "3:\n\t" \ |
| ".insn\n\t" \ |
| ".section\t.fixup,\"ax\"\n\t" \ |
| "4:\tli\t%0, %3\n\t" \ |
| "j\t3b\n\t" \ |
| ".previous\n\t" \ |
| ".section\t__ex_table,\"a\"\n\t" \ |
| STR(PTR)"\t1b, 4b\n\t" \ |
| STR(PTR)"\t2b, 4b\n\t" \ |
| ".previous" \ |
| : "=r" (res) \ |
| : "r" (value), "r" (addr), "i" (-EFAULT)); |
| #endif |
| |
| static void emulate_load_store_insn(struct pt_regs *regs, |
| void __user *addr, unsigned int __user *pc) |
| { |
| union mips_instruction insn; |
| unsigned long value; |
| unsigned int res; |
| unsigned long origpc; |
| unsigned long orig31; |
| void __user *fault_addr = NULL; |
| #ifdef CONFIG_EVA |
| mm_segment_t seg; |
| #endif |
| origpc = (unsigned long)pc; |
| orig31 = regs->regs[31]; |
| |
| perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); |
| |
| /* |
| * This load never faults. |
| */ |
| __get_user(insn.word, pc); |
| |
| switch (insn.i_format.opcode) { |
| /* |
| * These are instructions that a compiler doesn't generate. We |
| * can assume therefore that the code is MIPS-aware and |
| * really buggy. Emulating these instructions would break the |
| * semantics anyway. |
| */ |
| case ll_op: |
| case lld_op: |
| case sc_op: |
| case scd_op: |
| |
| /* |
| * For these instructions the only way to create an address |
| * error is an attempted access to kernel/supervisor address |
| * space. |
| */ |
| case ldl_op: |
| case ldr_op: |
| case lwl_op: |
| case lwr_op: |
| case sdl_op: |
| case sdr_op: |
| case swl_op: |
| case swr_op: |
| case lb_op: |
| case lbu_op: |
| case sb_op: |
| goto sigbus; |
| |
| /* |
| * The remaining opcodes are the ones that are really of |
| * interest. |
| */ |
| #ifdef CONFIG_EVA |
| case spec3_op: |
| /* |
| * we can land here only from kernel accessing user memory, |
| * so we need to "switch" the address limit to user space, so |
| * address check can work properly. |
| */ |
| seg = get_fs(); |
| set_fs(USER_DS); |
| switch (insn.spec3_format.func) { |
| case lhe_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) { |
| set_fs(seg); |
| goto sigbus; |
| } |
| LoadHW(addr, value, res); |
| if (res) { |
| set_fs(seg); |
| goto fault; |
| } |
| compute_return_epc(regs); |
| regs->regs[insn.spec3_format.rt] = value; |
| break; |
| case lwe_op: |
| if (!access_ok(VERIFY_READ, addr, 4)) { |
| set_fs(seg); |
| goto sigbus; |
| } |
| LoadW(addr, value, res); |
| if (res) { |
| set_fs(seg); |
| goto fault; |
| } |
| compute_return_epc(regs); |
| regs->regs[insn.spec3_format.rt] = value; |
| break; |
| case lhue_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) { |
| set_fs(seg); |
| goto sigbus; |
| } |
| LoadHWU(addr, value, res); |
| if (res) { |
| set_fs(seg); |
| goto fault; |
| } |
| compute_return_epc(regs); |
| regs->regs[insn.spec3_format.rt] = value; |
| break; |
| case she_op: |
| if (!access_ok(VERIFY_WRITE, addr, 2)) { |
| set_fs(seg); |
| goto sigbus; |
| } |
| compute_return_epc(regs); |
| value = regs->regs[insn.spec3_format.rt]; |
| StoreHW(addr, value, res); |
| if (res) { |
| set_fs(seg); |
| goto fault; |
| } |
| break; |
| case swe_op: |
| if (!access_ok(VERIFY_WRITE, addr, 4)) { |
| set_fs(seg); |
| goto sigbus; |
| } |
| compute_return_epc(regs); |
| value = regs->regs[insn.spec3_format.rt]; |
| StoreW(addr, value, res); |
| if (res) { |
| set_fs(seg); |
| goto fault; |
| } |
| break; |
| default: |
| set_fs(seg); |
| goto sigill; |
| } |
| set_fs(seg); |
| break; |
| #endif |
| case lh_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHW(addr, value, res); |
| if (res) |
| goto fault; |
| compute_return_epc(regs); |
| regs->regs[insn.i_format.rt] = value; |
| break; |
| |
| case lw_op: |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| compute_return_epc(regs); |
| regs->regs[insn.i_format.rt] = value; |
| break; |
| |
| case lhu_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHWU(addr, value, res); |
| if (res) |
| goto fault; |
| compute_return_epc(regs); |
| regs->regs[insn.i_format.rt] = value; |
| break; |
| |
| case lwu_op: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadWU(addr, value, res); |
| if (res) |
| goto fault; |
| compute_return_epc(regs); |
| regs->regs[insn.i_format.rt] = value; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| case ld_op: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 8)) |
| goto sigbus; |
| |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| compute_return_epc(regs); |
| regs->regs[insn.i_format.rt] = value; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| case sh_op: |
| if (!access_ok(VERIFY_WRITE, addr, 2)) |
| goto sigbus; |
| |
| compute_return_epc(regs); |
| value = regs->regs[insn.i_format.rt]; |
| StoreHW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| |
| case sw_op: |
| if (!access_ok(VERIFY_WRITE, addr, 4)) |
| goto sigbus; |
| |
| compute_return_epc(regs); |
| value = regs->regs[insn.i_format.rt]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| |
| case sd_op: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_WRITE, addr, 8)) |
| goto sigbus; |
| |
| compute_return_epc(regs); |
| value = regs->regs[insn.i_format.rt]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| case lwc1_op: |
| case ldc1_op: |
| case swc1_op: |
| case sdc1_op: |
| die_if_kernel("Unaligned FP access in kernel code", regs); |
| BUG_ON(!used_math()); |
| BUG_ON(!is_fpu_owner()); |
| |
| lose_fpu(1); /* Save FPU state for the emulator. */ |
| res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, |
| &fault_addr); |
| own_fpu(1); /* Restore FPU state. */ |
| |
| /* Signal if something went wrong. */ |
| process_fpemu_return(res, fault_addr); |
| |
| if (res == 0) |
| break; |
| return; |
| |
| /* |
| * COP2 is available to implementor for application specific use. |
| * It's up to applications to register a notifier chain and do |
| * whatever they have to do, including possible sending of signals. |
| */ |
| case lwc2_op: |
| cu2_notifier_call_chain(CU2_LWC2_OP, regs); |
| break; |
| |
| case ldc2_op: |
| cu2_notifier_call_chain(CU2_LDC2_OP, regs); |
| break; |
| |
| case swc2_op: |
| cu2_notifier_call_chain(CU2_SWC2_OP, regs); |
| break; |
| |
| case sdc2_op: |
| cu2_notifier_call_chain(CU2_SDC2_OP, regs); |
| break; |
| |
| default: |
| /* |
| * Pheeee... We encountered an yet unknown instruction or |
| * cache coherence problem. Die sucker, die ... |
| */ |
| goto sigill; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| unaligned_instructions++; |
| #endif |
| |
| return; |
| |
| fault: |
| /* roll back jump/branch */ |
| regs->cp0_epc = origpc; |
| regs->regs[31] = orig31; |
| /* Did we have an exception handler installed? */ |
| if (fixup_exception(regs)) |
| return; |
| |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGSEGV, current); |
| |
| return; |
| |
| sigbus: |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGBUS, current); |
| |
| return; |
| |
| sigill: |
| die_if_kernel |
| ("Unhandled kernel unaligned access or invalid instruction", regs); |
| force_sig(SIGILL, current); |
| } |
| |
| /* Recode table from 16-bit register notation to 32-bit GPR. */ |
| const int reg16to32[] = { 16, 17, 2, 3, 4, 5, 6, 7 }; |
| |
| /* Recode table from 16-bit STORE register notation to 32-bit GPR. */ |
| const int reg16to32st[] = { 0, 17, 2, 3, 4, 5, 6, 7 }; |
| |
| static void emulate_load_store_microMIPS(struct pt_regs *regs, |
| void __user *addr) |
| { |
| unsigned long value; |
| unsigned int res; |
| int i; |
| unsigned int reg = 0, rvar; |
| unsigned long orig31; |
| u16 __user *pc16; |
| u16 halfword; |
| unsigned int word; |
| unsigned long origpc, contpc; |
| union mips_instruction insn; |
| struct mm_decoded_insn mminsn; |
| void __user *fault_addr = NULL; |
| |
| origpc = regs->cp0_epc; |
| orig31 = regs->regs[31]; |
| |
| mminsn.micro_mips_mode = 1; |
| |
| /* |
| * This load never faults. |
| */ |
| pc16 = (unsigned short __user *)msk_isa16_mode(regs->cp0_epc); |
| __get_user(halfword, pc16); |
| pc16++; |
| contpc = regs->cp0_epc + 2; |
| word = ((unsigned int)halfword << 16); |
| mminsn.pc_inc = 2; |
| |
| if (!mm_insn_16bit(halfword)) { |
| __get_user(halfword, pc16); |
| pc16++; |
| contpc = regs->cp0_epc + 4; |
| mminsn.pc_inc = 4; |
| word |= halfword; |
| } |
| mminsn.insn = word; |
| |
| if (get_user(halfword, pc16)) |
| goto fault; |
| mminsn.next_pc_inc = 2; |
| word = ((unsigned int)halfword << 16); |
| |
| if (!mm_insn_16bit(halfword)) { |
| pc16++; |
| if (get_user(halfword, pc16)) |
| goto fault; |
| mminsn.next_pc_inc = 4; |
| word |= halfword; |
| } |
| mminsn.next_insn = word; |
| |
| insn = (union mips_instruction)(mminsn.insn); |
| if (mm_isBranchInstr(regs, mminsn, &contpc)) |
| insn = (union mips_instruction)(mminsn.next_insn); |
| |
| /* Parse instruction to find what to do */ |
| |
| switch (insn.mm_i_format.opcode) { |
| |
| case mm_pool32a_op: |
| switch (insn.mm_x_format.func) { |
| case mm_lwxs_op: |
| reg = insn.mm_x_format.rd; |
| goto loadW; |
| } |
| |
| goto sigbus; |
| |
| case mm_pool32b_op: |
| switch (insn.mm_m_format.func) { |
| case mm_lwp_func: |
| reg = insn.mm_m_format.rd; |
| if (reg == 31) |
| goto sigbus; |
| |
| if (!access_ok(VERIFY_READ, addr, 8)) |
| goto sigbus; |
| |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| addr += 4; |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg + 1] = value; |
| goto success; |
| |
| case mm_swp_func: |
| reg = insn.mm_m_format.rd; |
| if (reg == 31) |
| goto sigbus; |
| |
| if (!access_ok(VERIFY_WRITE, addr, 8)) |
| goto sigbus; |
| |
| value = regs->regs[reg]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| value = regs->regs[reg + 1]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| goto success; |
| |
| case mm_ldp_func: |
| #ifdef CONFIG_64BIT |
| reg = insn.mm_m_format.rd; |
| if (reg == 31) |
| goto sigbus; |
| |
| if (!access_ok(VERIFY_READ, addr, 16)) |
| goto sigbus; |
| |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| addr += 8; |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg + 1] = value; |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| goto sigill; |
| |
| case mm_sdp_func: |
| #ifdef CONFIG_64BIT |
| reg = insn.mm_m_format.rd; |
| if (reg == 31) |
| goto sigbus; |
| |
| if (!access_ok(VERIFY_WRITE, addr, 16)) |
| goto sigbus; |
| |
| value = regs->regs[reg]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 8; |
| value = regs->regs[reg + 1]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| goto sigill; |
| |
| case mm_lwm32_func: |
| reg = insn.mm_m_format.rd; |
| rvar = reg & 0xf; |
| if ((rvar > 9) || !reg) |
| goto sigill; |
| if (reg & 0x10) { |
| if (!access_ok |
| (VERIFY_READ, addr, 4 * (rvar + 1))) |
| goto sigbus; |
| } else { |
| if (!access_ok(VERIFY_READ, addr, 4 * rvar)) |
| goto sigbus; |
| } |
| if (rvar == 9) |
| rvar = 8; |
| for (i = 16; rvar; rvar--, i++) { |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| regs->regs[i] = value; |
| } |
| if ((reg & 0xf) == 9) { |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| regs->regs[30] = value; |
| } |
| if (reg & 0x10) { |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[31] = value; |
| } |
| goto success; |
| |
| case mm_swm32_func: |
| reg = insn.mm_m_format.rd; |
| rvar = reg & 0xf; |
| if ((rvar > 9) || !reg) |
| goto sigill; |
| if (reg & 0x10) { |
| if (!access_ok |
| (VERIFY_WRITE, addr, 4 * (rvar + 1))) |
| goto sigbus; |
| } else { |
| if (!access_ok(VERIFY_WRITE, addr, 4 * rvar)) |
| goto sigbus; |
| } |
| if (rvar == 9) |
| rvar = 8; |
| for (i = 16; rvar; rvar--, i++) { |
| value = regs->regs[i]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| } |
| if ((reg & 0xf) == 9) { |
| value = regs->regs[30]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| } |
| if (reg & 0x10) { |
| value = regs->regs[31]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| } |
| goto success; |
| |
| case mm_ldm_func: |
| #ifdef CONFIG_64BIT |
| reg = insn.mm_m_format.rd; |
| rvar = reg & 0xf; |
| if ((rvar > 9) || !reg) |
| goto sigill; |
| if (reg & 0x10) { |
| if (!access_ok |
| (VERIFY_READ, addr, 8 * (rvar + 1))) |
| goto sigbus; |
| } else { |
| if (!access_ok(VERIFY_READ, addr, 8 * rvar)) |
| goto sigbus; |
| } |
| if (rvar == 9) |
| rvar = 8; |
| |
| for (i = 16; rvar; rvar--, i++) { |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| regs->regs[i] = value; |
| } |
| if ((reg & 0xf) == 9) { |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 8; |
| regs->regs[30] = value; |
| } |
| if (reg & 0x10) { |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[31] = value; |
| } |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| goto sigill; |
| |
| case mm_sdm_func: |
| #ifdef CONFIG_64BIT |
| reg = insn.mm_m_format.rd; |
| rvar = reg & 0xf; |
| if ((rvar > 9) || !reg) |
| goto sigill; |
| if (reg & 0x10) { |
| if (!access_ok |
| (VERIFY_WRITE, addr, 8 * (rvar + 1))) |
| goto sigbus; |
| } else { |
| if (!access_ok(VERIFY_WRITE, addr, 8 * rvar)) |
| goto sigbus; |
| } |
| if (rvar == 9) |
| rvar = 8; |
| |
| for (i = 16; rvar; rvar--, i++) { |
| value = regs->regs[i]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 8; |
| } |
| if ((reg & 0xf) == 9) { |
| value = regs->regs[30]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 8; |
| } |
| if (reg & 0x10) { |
| value = regs->regs[31]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| } |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| goto sigill; |
| |
| /* LWC2, SWC2, LDC2, SDC2 are not serviced */ |
| } |
| |
| goto sigbus; |
| |
| case mm_pool32c_op: |
| switch (insn.mm_m_format.func) { |
| case mm_lwu_func: |
| reg = insn.mm_m_format.rd; |
| goto loadWU; |
| } |
| |
| /* LL,SC,LLD,SCD are not serviced */ |
| goto sigbus; |
| |
| case mm_pool32f_op: |
| switch (insn.mm_x_format.func) { |
| case mm_lwxc1_func: |
| case mm_swxc1_func: |
| case mm_ldxc1_func: |
| case mm_sdxc1_func: |
| goto fpu_emul; |
| } |
| |
| goto sigbus; |
| |
| case mm_ldc132_op: |
| case mm_sdc132_op: |
| case mm_lwc132_op: |
| case mm_swc132_op: |
| fpu_emul: |
| /* roll back jump/branch */ |
| regs->cp0_epc = origpc; |
| regs->regs[31] = orig31; |
| |
| die_if_kernel("Unaligned FP access in kernel code", regs); |
| BUG_ON(!used_math()); |
| BUG_ON(!is_fpu_owner()); |
| |
| lose_fpu(1); /* save the FPU state for the emulator */ |
| res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, |
| &fault_addr); |
| own_fpu(1); /* restore FPU state */ |
| |
| /* If something went wrong, signal */ |
| process_fpemu_return(res, fault_addr); |
| |
| if (res == 0) |
| goto success; |
| return; |
| |
| case mm_lh32_op: |
| reg = insn.mm_i_format.rt; |
| goto loadHW; |
| |
| case mm_lhu32_op: |
| reg = insn.mm_i_format.rt; |
| goto loadHWU; |
| |
| case mm_lw32_op: |
| reg = insn.mm_i_format.rt; |
| goto loadW; |
| |
| case mm_sh32_op: |
| reg = insn.mm_i_format.rt; |
| goto storeHW; |
| |
| case mm_sw32_op: |
| reg = insn.mm_i_format.rt; |
| goto storeW; |
| |
| case mm_ld32_op: |
| reg = insn.mm_i_format.rt; |
| goto loadDW; |
| |
| case mm_sd32_op: |
| reg = insn.mm_i_format.rt; |
| goto storeDW; |
| |
| case mm_pool16c_op: |
| switch (insn.mm16_m_format.func) { |
| case mm_lwm16_op: |
| reg = insn.mm16_m_format.rlist; |
| rvar = reg + 1; |
| if (!access_ok(VERIFY_READ, addr, 4 * rvar)) |
| goto sigbus; |
| |
| for (i = 16; rvar; rvar--, i++) { |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| regs->regs[i] = value; |
| } |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[31] = value; |
| |
| goto success; |
| |
| case mm_swm16_op: |
| reg = insn.mm16_m_format.rlist; |
| rvar = reg + 1; |
| if (!access_ok(VERIFY_WRITE, addr, 4 * rvar)) |
| goto sigbus; |
| |
| for (i = 16; rvar; rvar--, i++) { |
| value = regs->regs[i]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| addr += 4; |
| } |
| value = regs->regs[31]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| |
| goto success; |
| |
| } |
| |
| goto sigbus; |
| |
| case mm_lhu16_op: |
| reg = reg16to32[insn.mm16_rb_format.rt]; |
| goto loadHWU; |
| |
| case mm_lw16_op: |
| reg = reg16to32[insn.mm16_rb_format.rt]; |
| goto loadW; |
| |
| case mm_sh16_op: |
| reg = reg16to32st[insn.mm16_rb_format.rt]; |
| goto storeHW; |
| |
| case mm_sw16_op: |
| reg = reg16to32st[insn.mm16_rb_format.rt]; |
| goto storeW; |
| |
| case mm_lwsp16_op: |
| reg = insn.mm16_r5_format.rt; |
| goto loadW; |
| |
| case mm_swsp16_op: |
| reg = insn.mm16_r5_format.rt; |
| goto storeW; |
| |
| case mm_lwgp16_op: |
| reg = reg16to32[insn.mm16_r3_format.rt]; |
| goto loadW; |
| |
| default: |
| goto sigill; |
| } |
| |
| loadHW: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| goto success; |
| |
| loadHWU: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHWU(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| goto success; |
| |
| loadW: |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| goto success; |
| |
| loadWU: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadWU(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| loadDW: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 8)) |
| goto sigbus; |
| |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| regs->regs[reg] = value; |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| storeHW: |
| if (!access_ok(VERIFY_WRITE, addr, 2)) |
| goto sigbus; |
| |
| value = regs->regs[reg]; |
| StoreHW(addr, value, res); |
| if (res) |
| goto fault; |
| goto success; |
| |
| storeW: |
| if (!access_ok(VERIFY_WRITE, addr, 4)) |
| goto sigbus; |
| |
| value = regs->regs[reg]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| goto success; |
| |
| storeDW: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_WRITE, addr, 8)) |
| goto sigbus; |
| |
| value = regs->regs[reg]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| goto success; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| success: |
| regs->cp0_epc = contpc; /* advance or branch */ |
| |
| #ifdef CONFIG_DEBUG_FS |
| unaligned_instructions++; |
| #endif |
| return; |
| |
| fault: |
| /* roll back jump/branch */ |
| regs->cp0_epc = origpc; |
| regs->regs[31] = orig31; |
| /* Did we have an exception handler installed? */ |
| if (fixup_exception(regs)) |
| return; |
| |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGSEGV, current); |
| |
| return; |
| |
| sigbus: |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGBUS, current); |
| |
| return; |
| |
| sigill: |
| die_if_kernel |
| ("Unhandled kernel unaligned access or invalid instruction", regs); |
| force_sig(SIGILL, current); |
| } |
| |
| static void emulate_load_store_MIPS16e(struct pt_regs *regs, void __user * addr) |
| { |
| unsigned long value; |
| unsigned int res; |
| int reg; |
| unsigned long orig31; |
| u16 __user *pc16; |
| unsigned long origpc; |
| union mips16e_instruction mips16inst, oldinst; |
| |
| origpc = regs->cp0_epc; |
| orig31 = regs->regs[31]; |
| pc16 = (unsigned short __user *)msk_isa16_mode(origpc); |
| /* |
| * This load never faults. |
| */ |
| __get_user(mips16inst.full, pc16); |
| oldinst = mips16inst; |
| |
| /* skip EXTEND instruction */ |
| if (mips16inst.ri.opcode == MIPS16e_extend_op) { |
| pc16++; |
| __get_user(mips16inst.full, pc16); |
| } else if (delay_slot(regs)) { |
| /* skip jump instructions */ |
| /* JAL/JALX are 32 bits but have OPCODE in first short int */ |
| if (mips16inst.ri.opcode == MIPS16e_jal_op) |
| pc16++; |
| pc16++; |
| if (get_user(mips16inst.full, pc16)) |
| goto sigbus; |
| } |
| |
| switch (mips16inst.ri.opcode) { |
| case MIPS16e_i64_op: /* I64 or RI64 instruction */ |
| switch (mips16inst.i64.func) { /* I64/RI64 func field check */ |
| case MIPS16e_ldpc_func: |
| case MIPS16e_ldsp_func: |
| reg = reg16to32[mips16inst.ri64.ry]; |
| goto loadDW; |
| |
| case MIPS16e_sdsp_func: |
| reg = reg16to32[mips16inst.ri64.ry]; |
| goto writeDW; |
| |
| case MIPS16e_sdrasp_func: |
| reg = 29; /* GPRSP */ |
| goto writeDW; |
| } |
| |
| goto sigbus; |
| |
| case MIPS16e_swsp_op: |
| case MIPS16e_lwpc_op: |
| case MIPS16e_lwsp_op: |
| reg = reg16to32[mips16inst.ri.rx]; |
| break; |
| |
| case MIPS16e_i8_op: |
| if (mips16inst.i8.func != MIPS16e_swrasp_func) |
| goto sigbus; |
| reg = 29; /* GPRSP */ |
| break; |
| |
| default: |
| reg = reg16to32[mips16inst.rri.ry]; |
| break; |
| } |
| |
| switch (mips16inst.ri.opcode) { |
| |
| case MIPS16e_lb_op: |
| case MIPS16e_lbu_op: |
| case MIPS16e_sb_op: |
| goto sigbus; |
| |
| case MIPS16e_lh_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHW(addr, value, res); |
| if (res) |
| goto fault; |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| regs->regs[reg] = value; |
| break; |
| |
| case MIPS16e_lhu_op: |
| if (!access_ok(VERIFY_READ, addr, 2)) |
| goto sigbus; |
| |
| LoadHWU(addr, value, res); |
| if (res) |
| goto fault; |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| regs->regs[reg] = value; |
| break; |
| |
| case MIPS16e_lw_op: |
| case MIPS16e_lwpc_op: |
| case MIPS16e_lwsp_op: |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadW(addr, value, res); |
| if (res) |
| goto fault; |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| regs->regs[reg] = value; |
| break; |
| |
| case MIPS16e_lwu_op: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 4)) |
| goto sigbus; |
| |
| LoadWU(addr, value, res); |
| if (res) |
| goto fault; |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| regs->regs[reg] = value; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| case MIPS16e_ld_op: |
| loadDW: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_READ, addr, 8)) |
| goto sigbus; |
| |
| LoadDW(addr, value, res); |
| if (res) |
| goto fault; |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| regs->regs[reg] = value; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| case MIPS16e_sh_op: |
| if (!access_ok(VERIFY_WRITE, addr, 2)) |
| goto sigbus; |
| |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| value = regs->regs[reg]; |
| StoreHW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| |
| case MIPS16e_sw_op: |
| case MIPS16e_swsp_op: |
| case MIPS16e_i8_op: /* actually - MIPS16e_swrasp_func */ |
| if (!access_ok(VERIFY_WRITE, addr, 4)) |
| goto sigbus; |
| |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| value = regs->regs[reg]; |
| StoreW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| |
| case MIPS16e_sd_op: |
| writeDW: |
| #ifdef CONFIG_64BIT |
| /* |
| * A 32-bit kernel might be running on a 64-bit processor. But |
| * if we're on a 32-bit processor and an i-cache incoherency |
| * or race makes us see a 64-bit instruction here the sdl/sdr |
| * would blow up, so for now we don't handle unaligned 64-bit |
| * instructions on 32-bit kernels. |
| */ |
| if (!access_ok(VERIFY_WRITE, addr, 8)) |
| goto sigbus; |
| |
| MIPS16e_compute_return_epc(regs, &oldinst); |
| value = regs->regs[reg]; |
| StoreDW(addr, value, res); |
| if (res) |
| goto fault; |
| break; |
| #endif /* CONFIG_64BIT */ |
| |
| /* Cannot handle 64-bit instructions in 32-bit kernel */ |
| goto sigill; |
| |
| default: |
| /* |
| * Pheeee... We encountered an yet unknown instruction or |
| * cache coherence problem. Die sucker, die ... |
| */ |
| goto sigill; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| unaligned_instructions++; |
| #endif |
| |
| return; |
| |
| fault: |
| /* roll back jump/branch */ |
| regs->cp0_epc = origpc; |
| regs->regs[31] = orig31; |
| /* Did we have an exception handler installed? */ |
| if (fixup_exception(regs)) |
| return; |
| |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGSEGV, current); |
| |
| return; |
| |
| sigbus: |
| die_if_kernel("Unhandled kernel unaligned access", regs); |
| force_sig(SIGBUS, current); |
| |
| return; |
| |
| sigill: |
| die_if_kernel |
| ("Unhandled kernel unaligned access or invalid instruction", regs); |
| force_sig(SIGILL, current); |
| } |
| |
| asmlinkage void do_ade(struct pt_regs *regs) |
| { |
| enum ctx_state prev_state; |
| unsigned int __user *pc; |
| mm_segment_t seg; |
| |
| prev_state = exception_enter(); |
| perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, |
| 1, regs, regs->cp0_badvaddr); |
| /* |
| * Did we catch a fault trying to load an instruction? |
| */ |
| if (regs->cp0_badvaddr == regs->cp0_epc) |
| goto sigbus; |
| |
| if (user_mode(regs) && !test_thread_flag(TIF_FIXADE)) |
| goto sigbus; |
| if (unaligned_action == UNALIGNED_ACTION_SIGNAL) |
| goto sigbus; |
| |
| /* |
| * Do branch emulation only if we didn't forward the exception. |
| * This is all so but ugly ... |
| */ |
| |
| /* |
| * Are we running in microMIPS mode? |
| */ |
| if (get_isa16_mode(regs->cp0_epc)) { |
| /* |
| * Did we catch a fault trying to load an instruction in |
| * 16-bit mode? |
| */ |
| if (regs->cp0_badvaddr == msk_isa16_mode(regs->cp0_epc)) |
| goto sigbus; |
| if (unaligned_action == UNALIGNED_ACTION_SHOW) |
| show_registers(regs); |
| |
| if (cpu_has_mmips) { |
| seg = get_fs(); |
| if (!user_mode(regs)) |
| set_fs(KERNEL_DS); |
| emulate_load_store_microMIPS(regs, |
| (void __user *)regs->cp0_badvaddr); |
| set_fs(seg); |
| |
| return; |
| } |
| |
| if (cpu_has_mips16) { |
| seg = get_fs(); |
| if (!user_mode(regs)) |
| set_fs(KERNEL_DS); |
| emulate_load_store_MIPS16e(regs, |
| (void __user *)regs->cp0_badvaddr); |
| set_fs(seg); |
| |
| return; |
| } |
| |
| goto sigbus; |
| } |
| |
| if (unaligned_action == UNALIGNED_ACTION_SHOW) |
| show_registers(regs); |
| pc = (unsigned int __user *)exception_epc(regs); |
| |
| seg = get_fs(); |
| if (!user_mode(regs)) |
| set_fs(KERNEL_DS); |
| emulate_load_store_insn(regs, (void __user *)regs->cp0_badvaddr, pc); |
| set_fs(seg); |
| |
| return; |
| |
| sigbus: |
| die_if_kernel("Kernel unaligned instruction access", regs); |
| force_sig(SIGBUS, current); |
| |
| /* |
| * XXX On return from the signal handler we should advance the epc |
| */ |
| exception_exit(prev_state); |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| extern struct dentry *mips_debugfs_dir; |
| static int __init debugfs_unaligned(void) |
| { |
| struct dentry *d; |
| |
| if (!mips_debugfs_dir) |
| return -ENODEV; |
| d = debugfs_create_u32("unaligned_instructions", S_IRUGO, |
| mips_debugfs_dir, &unaligned_instructions); |
| if (!d) |
| return -ENOMEM; |
| d = debugfs_create_u32("unaligned_action", S_IRUGO | S_IWUSR, |
| mips_debugfs_dir, &unaligned_action); |
| if (!d) |
| return -ENOMEM; |
| return 0; |
| } |
| __initcall(debugfs_unaligned); |
| #endif |
