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MIPS: Switch FPU emulator trap to BREAK instruction.

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Arguably using the address error handler has always been ugly.  But with
processors that handle unaligned loads and stores in hardware the
current mechanism ceases to work so switch it to a BREAK instruction and
allocate break code 514 to the FPU emulator.

Yoichi Yuasa provided a build fix for CONFIG_BUG=n.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
This commit is contained in:
Ralf Baechle
2008-10-28 17:38:42 +00:00
parent 076c6e4f4d
commit ba3049ed40
7 changed files with 37 additions and 37 deletions
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4
arch/mips/math-emu/cp1emu.c
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@ -48,7 +48,6 @@
#include <asm/branch.h>
#include "ieee754.h"
#include "dsemul.h"
/* Strap kernel emulator for full MIPS IV emulation */
@ -346,9 +345,6 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
/* cop control register rd -> gpr[rt] */
u32 value;
if (ir == CP1UNDEF) {
return do_dsemulret(xcp);
}
if (MIPSInst_RD(ir) == FPCREG_CSR) {
value = ctx->fcr31;
value = (value & ~0x3) | mips_rm[value & 0x3];