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sh: Add a few more branch types to the branch emulator. 

This plugs in some extra encodings for matching more bsr/bsrf/jsr
branches.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-11-26 13:06:04 +09:00
parent 5dd614761f
commit edfd6da040
1 changed files with 11 additions and 6 deletions
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17
arch/sh/kernel/traps_32.c
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@ -689,7 +689,7 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
} }
#ifdef CONFIG_SH_FPU_EMU #ifdef CONFIG_SH_FPU_EMU
static int emulate_branch(unsigned short inst, struct pt_regs* regs) static int emulate_branch(unsigned short inst, struct pt_regs *regs)
{ {
/* /*
* bfs: 8fxx: PC+=d*2+4; * bfs: 8fxx: PC+=d*2+4;
@ -702,27 +702,32 @@ static int emulate_branch(unsigned short inst, struct pt_regs* regs)
* jsr: 4x0b: PC=Rn after PR=PC+4; * jsr: 4x0b: PC=Rn after PR=PC+4;
* rts: 000b: PC=PR; * rts: 000b: PC=PR;
*/ */
if ((inst & 0xfd00) == 0x8d00) { if (((inst & 0xf000) == 0xb000) || /* bsr */
((inst & 0xf0ff) == 0x0003) || /* bsrf */
((inst & 0xf0ff) == 0x400b)) /* jsr */
regs->pr = regs->pc + 4;
if ((inst & 0xfd00) == 0x8d00) { /* bfs, bts */
regs->pc += SH_PC_8BIT_OFFSET(inst); regs->pc += SH_PC_8BIT_OFFSET(inst);
return 0; return 0;
} }
if ((inst & 0xe000) == 0xa000) { if ((inst & 0xe000) == 0xa000) { /* bra, bsr */
regs->pc += SH_PC_12BIT_OFFSET(inst); regs->pc += SH_PC_12BIT_OFFSET(inst);
return 0; return 0;
} }
if ((inst & 0xf0df) == 0x0003) { if ((inst & 0xf0df) == 0x0003) { /* braf, bsrf */
regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4; regs->pc += regs->regs[(inst & 0x0f00) >> 8] + 4;
return 0; return 0;
} }
if ((inst & 0xf0df) == 0x400b) { if ((inst & 0xf0df) == 0x400b) { /* jmp, jsr */
regs->pc = regs->regs[(inst & 0x0f00) >> 8]; regs->pc = regs->regs[(inst & 0x0f00) >> 8];
return 0; return 0;
} }
if ((inst & 0xffff) == 0x000b) { if ((inst & 0xffff) == 0x000b) { /* rts */
regs->pc = regs->pr; regs->pc = regs->pr;
return 0; return 0;
} }