diff options
Diffstat (limited to 'arch/mips/kernel/unaligned.c')
| -rw-r--r-- | arch/mips/kernel/unaligned.c | 1489 |
1 files changed, 1284 insertions, 205 deletions
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c index 6087a54c86a0..203d8857070d 100644 --- a/arch/mips/kernel/unaligned.c +++ b/arch/mips/kernel/unaligned.c @@ -83,8 +83,12 @@ #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 @@ -102,12 +106,332 @@ static u32 unaligned_action; #endif extern void show_registers(struct pt_regs *regs); +#ifdef __BIG_ENDIAN +#define LoadHW(addr, value, res) \ + __asm__ __volatile__ (".set\tnoat\n" \ + "1:\tlb\t%0, 0(%2)\n" \ + "2:\tlbu\t$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:\tlwl\t%0, (%2)\n" \ + "2:\tlwr\t%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:\tlbu\t%0, 0(%2)\n" \ + "2:\tlbu\t$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:\tlwl\t%0, (%2)\n" \ + "2:\tlwr\t%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:\tsb\t%1, 1(%2)\n\t" \ + "srl\t$1, %1, 0x8\n" \ + "2:\tsb\t$1, 0(%2)\n\t" \ + ".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:\tswl\t%1,(%2)\n" \ + "2:\tswr\t%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:\tlb\t%0, 1(%2)\n" \ + "2:\tlbu\t$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:\tlwl\t%0, 3(%2)\n" \ + "2:\tlwr\t%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:\tlbu\t%0, 1(%2)\n" \ + "2:\tlbu\t$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:\tlwl\t%0, 3(%2)\n" \ + "2:\tlwr\t%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:\tsb\t%1, 0(%2)\n\t" \ + "srl\t$1,%1, 0x8\n" \ + "2:\tsb\t$1, 1(%2)\n\t" \ + ".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:\tswl\t%1, 3(%2)\n" \ + "2:\tswr\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)); + +#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; + + origpc = (unsigned long)pc; + orig31 = regs->regs[31]; perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); @@ -117,22 +441,22 @@ static void emulate_load_store_insn(struct pt_regs *regs, __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. - */ + /* + * 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. - */ + /* + * 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: @@ -146,36 +470,15 @@ static void emulate_load_store_insn(struct pt_regs *regs, case sb_op: goto sigbus; - /* - * The remaining opcodes are the ones that are really of interest. - */ + /* + * The remaining opcodes are the ones that are really of + * interest. + */ case lh_op: if (!access_ok(VERIFY_READ, addr, 2)) goto sigbus; - __asm__ __volatile__ (".set\tnoat\n" -#ifdef __BIG_ENDIAN - "1:\tlb\t%0, 0(%2)\n" - "2:\tlbu\t$1, 1(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tlb\t%0, 1(%2)\n" - "2:\tlbu\t$1, 0(%2)\n\t" -#endif - "sll\t%0, 0x8\n\t" - "or\t%0, $1\n\t" - "li\t%1, 0\n" - "3:\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)); + LoadHW(addr, value, res); if (res) goto fault; compute_return_epc(regs); @@ -186,26 +489,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_READ, addr, 4)) goto sigbus; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - "1:\tlwl\t%0, (%2)\n" - "2:\tlwr\t%0, 3(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tlwl\t%0, 3(%2)\n" - "2:\tlwr\t%0, (%2)\n\t" -#endif - "li\t%1, 0\n" - "3:\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)); + LoadW(addr, value, res); if (res) goto fault; compute_return_epc(regs); @@ -216,30 +500,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_READ, addr, 2)) goto sigbus; - __asm__ __volatile__ ( - ".set\tnoat\n" -#ifdef __BIG_ENDIAN - "1:\tlbu\t%0, 0(%2)\n" - "2:\tlbu\t$1, 1(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tlbu\t%0, 1(%2)\n" - "2:\tlbu\t$1, 0(%2)\n\t" -#endif - "sll\t%0, 0x8\n\t" - "or\t%0, $1\n\t" - "li\t%1, 0\n" - "3:\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)); + LoadHWU(addr, value, res); if (res) goto fault; compute_return_epc(regs); @@ -258,28 +519,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_READ, addr, 4)) goto sigbus; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - "1:\tlwl\t%0, (%2)\n" - "2:\tlwr\t%0, 3(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tlwl\t%0, 3(%2)\n" - "2:\tlwr\t%0, (%2)\n\t" -#endif - "dsll\t%0, %0, 32\n\t" - "dsrl\t%0, %0, 32\n\t" - "li\t%1, 0\n" - "3:\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)); + LoadWU(addr, value, res); if (res) goto fault; compute_return_epc(regs); @@ -302,26 +542,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_READ, addr, 8)) goto sigbus; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - "1:\tldl\t%0, (%2)\n" - "2:\tldr\t%0, 7(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tldl\t%0, 7(%2)\n" - "2:\tldr\t%0, (%2)\n\t" -#endif - "li\t%1, 0\n" - "3:\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)); + LoadDW(addr, value, res); if (res) goto fault; compute_return_epc(regs); @@ -336,68 +557,22 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, addr, 2)) goto sigbus; + compute_return_epc(regs); value = regs->regs[insn.i_format.rt]; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - ".set\tnoat\n" - "1:\tsb\t%1, 1(%2)\n\t" - "srl\t$1, %1, 0x8\n" - "2:\tsb\t$1, 0(%2)\n\t" - ".set\tat\n\t" -#endif -#ifdef __LITTLE_ENDIAN - ".set\tnoat\n" - "1:\tsb\t%1, 0(%2)\n\t" - "srl\t$1,%1, 0x8\n" - "2:\tsb\t$1, 1(%2)\n\t" - ".set\tat\n\t" -#endif - "li\t%0, 0\n" - "3:\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)); + StoreHW(addr, value, res); if (res) goto fault; - compute_return_epc(regs); break; case sw_op: if (!access_ok(VERIFY_WRITE, addr, 4)) goto sigbus; + compute_return_epc(regs); value = regs->regs[insn.i_format.rt]; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - "1:\tswl\t%1,(%2)\n" - "2:\tswr\t%1, 3(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tswl\t%1, 3(%2)\n" - "2:\tswr\t%1, (%2)\n\t" -#endif - "li\t%0, 0\n" - "3:\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)); + StoreW(addr, value, res); if (res) goto fault; - compute_return_epc(regs); break; case sd_op: @@ -412,31 +587,11 @@ static void emulate_load_store_insn(struct pt_regs *regs, if (!access_ok(VERIFY_WRITE, addr, 8)) goto sigbus; + compute_return_epc(regs); value = regs->regs[insn.i_format.rt]; - __asm__ __volatile__ ( -#ifdef __BIG_ENDIAN - "1:\tsdl\t%1,(%2)\n" - "2:\tsdr\t%1, 7(%2)\n\t" -#endif -#ifdef __LITTLE_ENDIAN - "1:\tsdl\t%1, 7(%2)\n" - "2:\tsdr\t%1, (%2)\n\t" -#endif - "li\t%0, 0\n" - "3:\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)); + StoreDW(addr, value, res); if (res) goto fault; - compute_return_epc(regs); break; #endif /* CONFIG_64BIT */ @@ -447,10 +602,21 @@ static void emulate_load_store_insn(struct pt_regs *regs, case ldc1_op: case swc1_op: case sdc1_op: - /* - * I herewith declare: this does not happen. So send SIGBUS. - */ - goto sigbus; + 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. @@ -488,6 +654,9 @@ static void emulate_load_store_insn(struct pt_regs *regs, 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; @@ -504,10 +673,881 @@ sigbus: return; sigill: - die_if_kernel("Unhandled kernel unaligned access or invalid instruction", regs); + 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 }; + +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) { unsigned int __user *pc; @@ -517,23 +1557,62 @@ asmlinkage void do_ade(struct pt_regs *regs) 1, regs, regs->cp0_badvaddr); /* * Did we catch a fault trying to load an instruction? - * Or are we running in MIPS16 mode? */ - if ((regs->cp0_badvaddr == regs->cp0_epc) || (regs->cp0_epc & 0x1)) + if (regs->cp0_badvaddr == regs->cp0_epc) goto sigbus; - pc = (unsigned int __user *) exception_epc(regs); if (user_mode(regs) && !test_thread_flag(TIF_FIXADE)) goto sigbus; if (unaligned_action == UNALIGNED_ACTION_SIGNAL) goto sigbus; - else if (unaligned_action == UNALIGNED_ACTION_SHOW) - show_registers(regs); /* * 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); |