diff options
Diffstat (limited to 'arch/mips/kernel/traps.c')
| -rw-r--r-- | arch/mips/kernel/traps.c | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index d5fbfb51b9da..afa447e5e97f 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -46,6 +46,7 @@ #include <asm/fpu.h> #include <asm/fpu_emulator.h> #include <asm/idle.h> +#include <asm/mips-r2-to-r6-emul.h> #include <asm/mipsregs.h> #include <asm/mipsmtregs.h> #include <asm/module.h> @@ -837,7 +838,7 @@ out: exception_exit(prev_state); } -static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, +void do_trap_or_bp(struct pt_regs *regs, unsigned int code, const char *str) { siginfo_t info; @@ -1027,7 +1028,34 @@ asmlinkage void do_ri(struct pt_regs *regs) unsigned int opcode = 0; int status = -1; + /* + * Avoid any kernel code. Just emulate the R2 instruction + * as quickly as possible. + */ + if (mipsr2_emulation && cpu_has_mips_r6 && + likely(user_mode(regs))) { + if (likely(get_user(opcode, epc) >= 0)) { + status = mipsr2_decoder(regs, opcode); + switch (status) { + case 0: + case SIGEMT: + task_thread_info(current)->r2_emul_return = 1; + return; + case SIGILL: + goto no_r2_instr; + default: + process_fpemu_return(status, + ¤t->thread.cp0_baduaddr); + task_thread_info(current)->r2_emul_return = 1; + return; + } + } + } + +no_r2_instr: + prev_state = exception_enter(); + if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL) == NOTIFY_STOP) goto out; @@ -1559,6 +1587,7 @@ static inline void parity_protection_init(void) case CPU_INTERAPTIV: case CPU_PROAPTIV: case CPU_P5600: + case CPU_QEMU_GENERIC: { #define ERRCTL_PE 0x80000000 #define ERRCTL_L2P 0x00800000 @@ -1648,7 +1677,7 @@ asmlinkage void cache_parity_error(void) printk("Decoded c0_cacheerr: %s cache fault in %s reference.\n", reg_val & (1<<30) ? "secondary" : "primary", reg_val & (1<<31) ? "data" : "insn"); - if (cpu_has_mips_r2 && + if ((cpu_has_mips_r2_r6) && ((current_cpu_data.processor_id & 0xff0000) == PRID_COMP_MIPS)) { pr_err("Error bits: %s%s%s%s%s%s%s%s\n", reg_val & (1<<29) ? "ED " : "", @@ -1688,7 +1717,7 @@ asmlinkage void do_ftlb(void) unsigned int reg_val; /* For the moment, report the problem and hang. */ - if (cpu_has_mips_r2 && + if ((cpu_has_mips_r2_r6) && ((current_cpu_data.processor_id & 0xff0000) == PRID_COMP_MIPS)) { pr_err("FTLB error exception, cp0_ecc=0x%08x:\n", read_c0_ecc()); @@ -1977,7 +2006,7 @@ static void configure_hwrena(void) { unsigned int hwrena = cpu_hwrena_impl_bits; - if (cpu_has_mips_r2) + if (cpu_has_mips_r2_r6) hwrena |= 0x0000000f; if (!noulri && cpu_has_userlocal) @@ -2021,7 +2050,7 @@ void per_cpu_trap_init(bool is_boot_cpu) * o read IntCtl.IPTI to determine the timer interrupt * o read IntCtl.IPPCI to determine the performance counter interrupt */ - if (cpu_has_mips_r2) { + if (cpu_has_mips_r2_r6) { cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP; cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7; cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7; @@ -2112,7 +2141,7 @@ void __init trap_init(void) #else ebase = CKSEG0; #endif - if (cpu_has_mips_r2) + if (cpu_has_mips_r2_r6) ebase += (read_c0_ebase() & 0x3ffff000); } |