diff options
Diffstat (limited to 'arch/mips/math-emu/dsemul.c')
| -rw-r--r-- | arch/mips/math-emu/dsemul.c | 68 |
1 files changed, 32 insertions, 36 deletions
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c index 36d975ae08f..4f514f3724c 100644 --- a/arch/mips/math-emu/dsemul.c +++ b/arch/mips/math-emu/dsemul.c @@ -1,38 +1,19 @@ -#include <linux/compiler.h> -#include <linux/mm.h> -#include <linux/signal.h> -#include <linux/smp.h> - -#include <asm/asm.h> -#include <asm/bootinfo.h> -#include <asm/byteorder.h> -#include <asm/cpu.h> -#include <asm/inst.h> -#include <asm/processor.h> -#include <asm/uaccess.h> #include <asm/branch.h> -#include <asm/mipsregs.h> -#include <asm/system.h> #include <asm/cacheflush.h> - #include <asm/fpu_emulator.h> +#include <asm/inst.h> +#include <asm/mipsregs.h> +#include <asm/uaccess.h> #include "ieee754.h" -/* Strap kernel emulator for full MIPS IV emulation */ - -#ifdef __mips -#undef __mips -#endif -#define __mips 4 - /* * Emulate the arbritrary instruction ir at xcp->cp0_epc. Required when * we have to emulate the instruction in a COP1 branch delay slot. Do * not change cp0_epc due to the instruction * * According to the spec: - * 1) it shouldnt be a branch :-) + * 1) it shouldn't be a branch :-) * 2) it can be a COP instruction :-( * 3) if we are tring to run a protected memory space we must take * special care on memory access instructions :-( @@ -56,15 +37,15 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc) struct emuframe __user *fr; int err; - if (ir == 0) { /* a nop is easy */ + if ((get_isa16_mode(regs->cp0_epc) && ((ir >> 16) == MM_NOP16)) || + (ir == 0)) { + /* NOP is easy */ regs->cp0_epc = cpc; - regs->cp0_cause &= ~CAUSEF_BD; + clear_delay_slot(regs); return 0; } -#ifdef DSEMUL_TRACE - printk("dsemul %lx %lx\n", regs->cp0_epc, cpc); -#endif + pr_debug("dsemul %lx %lx\n", regs->cp0_epc, cpc); /* * The strategy is to push the instruction onto the user stack @@ -92,8 +73,16 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc) if (unlikely(!access_ok(VERIFY_WRITE, fr, sizeof(struct emuframe)))) return SIGBUS; - err = __put_user(ir, &fr->emul); - err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst); + if (get_isa16_mode(regs->cp0_epc)) { + err = __put_user(ir >> 16, (u16 __user *)(&fr->emul)); + err |= __put_user(ir & 0xffff, (u16 __user *)((long)(&fr->emul) + 2)); + err |= __put_user(BREAK_MATH >> 16, (u16 __user *)(&fr->badinst)); + err |= __put_user(BREAK_MATH & 0xffff, (u16 __user *)((long)(&fr->badinst) + 2)); + } else { + err = __put_user(ir, &fr->emul); + err |= __put_user((mips_instruction)BREAK_MATH, &fr->badinst); + } + err |= __put_user((mips_instruction)BD_COOKIE, &fr->cookie); err |= __put_user(cpc, &fr->epc); @@ -102,7 +91,8 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc) return SIGBUS; } - regs->cp0_epc = (unsigned long) &fr->emul; + regs->cp0_epc = ((unsigned long) &fr->emul) | + get_isa16_mode(regs->cp0_epc); flush_cache_sigtramp((unsigned long)&fr->badinst); @@ -115,9 +105,10 @@ int do_dsemulret(struct pt_regs *xcp) unsigned long epc; u32 insn, cookie; int err = 0; + u16 instr[2]; fr = (struct emuframe __user *) - (xcp->cp0_epc - sizeof(mips_instruction)); + (msk_isa16_mode(xcp->cp0_epc) - sizeof(mips_instruction)); /* * If we can't even access the area, something is very wrong, but we'll @@ -132,7 +123,13 @@ int do_dsemulret(struct pt_regs *xcp) * - Is the instruction pointed to by the EPC an BREAK_MATH? * - Is the following memory word the BD_COOKIE? */ - err = __get_user(insn, &fr->badinst); + if (get_isa16_mode(xcp->cp0_epc)) { + err = __get_user(instr[0], (u16 __user *)(&fr->badinst)); + err |= __get_user(instr[1], (u16 __user *)((long)(&fr->badinst) + 2)); + insn = (instr[0] << 16) | instr[1]; + } else { + err = __get_user(insn, &fr->badinst); + } err |= __get_user(cookie, &fr->cookie); if (unlikely(err || (insn != BREAK_MATH) || (cookie != BD_COOKIE))) { @@ -150,9 +147,8 @@ int do_dsemulret(struct pt_regs *xcp) * emulating the branch delay instruction. */ -#ifdef DSEMUL_TRACE - printk("dsemulret\n"); -#endif + pr_debug("dsemulret\n"); + if (__get_user(epc, &fr->epc)) { /* Saved EPC */ /* This is not a good situation to be in */ force_sig(SIGBUS, current); |