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sh: Add unaligned memory access for PC relative intructions 

This adds unaligned memory access support for the following instructions:
  mov.w @(disp,PC),Rn
  mov.l @(disp,PC),Rn

These instructions are often used on SH2A toolchains.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Phil Edworthy 2011-08-24 10:43:59 +00:00 committed by Paul Mundt
parent 0710b91c51
commit 34f7145a63
1 changed files with 35 additions and 0 deletions
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35
arch/sh/kernel/traps_32.c
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@ -316,6 +316,35 @@ static int handle_unaligned_ins(insn_size_t instruction, struct pt_regs *regs,
break;
}
break;
case 9: /* mov.w @(disp,PC),Rn */
srcu = (unsigned char __user *)regs->pc;
srcu += 4;
srcu += (instruction & 0x00FF) << 1;
dst = (unsigned char *)rn;
*(unsigned long *)dst = 0;
#if !defined(__LITTLE_ENDIAN__)
dst += 2;
#endif
if (ma->from(dst, srcu, 2))
goto fetch_fault;
sign_extend(2, dst);
ret = 0;
break;
case 0xd: /* mov.l @(disp,PC),Rn */
srcu = (unsigned char __user *)(regs->pc & ~0x3);
srcu += 4;
srcu += (instruction & 0x00FF) << 2;
dst = (unsigned char *)rn;
*(unsigned long *)dst = 0;
if (ma->from(dst, srcu, 4))
goto fetch_fault;
ret = 0;
break;
}
return ret;
@ -496,6 +525,9 @@ int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
}
break;
case 0x9000: /* mov.w @(disp,Rm),Rn */
goto simple;
case 0xA000: /* bra label */
ret = handle_delayslot(regs, instruction, ma);
if (ret==0)
@ -509,6 +541,9 @@ int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
regs->pc += SH_PC_12BIT_OFFSET(instruction);
}
break;
case 0xD000: /* mov.l @(disp,Rm),Rn */
goto simple;
}
return ret;