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MIPS: microMIPS: Floating point support.

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Add logic needed to do floating point emulation in microMIPS mode.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Steven J. Hill <Steven. Hill@imgtec.com>
This commit is contained in:
Leonid Yegoshin
2013-03-25 12:09:02 -05:00
committed by Ralf Baechle
parent cf6d905828
commit 102cedc32a
7 changed files with 900 additions and 107 deletions
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30
arch/mips/math-emu/dsemul.c
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@@ -55,7 +55,9 @@ 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;
return 0;
@@ -91,8 +93,16 @@ 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);
@@ -101,7 +111,8 @@ 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);
@@ -114,9 +125,10 @@ 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
@@ -131,7 +143,13 @@ 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))) {