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Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r--arch/mips/kernel/traps.c60
1 files changed, 54 insertions, 6 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index c3b41e24c05a..33984c04b60b 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,
+ &current->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;
@@ -1134,10 +1162,29 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action,
return NOTIFY_OK;
}
+static int wait_on_fp_mode_switch(atomic_t *p)
+{
+ /*
+ * The FP mode for this task is currently being switched. That may
+ * involve modifications to the format of this tasks FP context which
+ * make it unsafe to proceed with execution for the moment. Instead,
+ * schedule some other task.
+ */
+ schedule();
+ return 0;
+}
+
static int enable_restore_fp_context(int msa)
{
int err, was_fpu_owner, prior_msa;
+ /*
+ * If an FP mode switch is currently underway, wait for it to
+ * complete before proceeding.
+ */
+ wait_on_atomic_t(&current->mm->context.fp_mode_switching,
+ wait_on_fp_mode_switch, TASK_KILLABLE);
+
if (!used_math()) {
/* First time FP context user. */
preempt_disable();
@@ -1541,6 +1588,7 @@ 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
@@ -1630,7 +1678,7 @@ 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 " : "",
@@ -1670,7 +1718,7 @@ 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());
@@ -1959,7 +2007,7 @@ 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)
@@ -2003,7 +2051,7 @@ 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;
@@ -2094,7 +2142,7 @@ 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);
}