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powerpc: Emulate vector element load/store instructions

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This adds code to analyse_instr() and emulate_step() to handle the
vector element loads and stores:

lvebx, lvehx, lvewx, stvebx, stvehx, stvewx.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras 2017-08-30 14:12:34 +10:00 committed by Michael Ellerman
parent c22435a5f3
commit e61ccc7b0c
1 changed files with 36 additions and 2 deletions
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38
arch/powerpc/lib/sstep.c
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@ -476,7 +476,7 @@ static nokprobe_inline int do_vec_load(int rn, unsigned long ea,
return -EFAULT;
/* align to multiple of size */
ea &= ~(size - 1);
err = copy_mem_in(u.b, ea, size);
err = copy_mem_in(&u.b[ea & 0xf], ea, size);
if (err)
return err;
@ -508,7 +508,7 @@ static nokprobe_inline int do_vec_store(int rn, unsigned long ea,
else
u.v = current->thread.vr_state.vr[rn];
preempt_enable();
return copy_mem_out(u.b, ea, size);
return copy_mem_out(&u.b[ea & 0xf], ea, size);
}
#endif /* CONFIG_ALTIVEC */
@ -1807,12 +1807,46 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
break;
#ifdef CONFIG_ALTIVEC
/*
* Note: for the load/store vector element instructions,
* bits of the EA say which field of the VMX register to use.
*/
case 7: /* lvebx */
op->type = MKOP(LOAD_VMX, 0, 1);
op->element_size = 1;
break;
case 39: /* lvehx */
op->type = MKOP(LOAD_VMX, 0, 2);
op->element_size = 2;
break;
case 71: /* lvewx */
op->type = MKOP(LOAD_VMX, 0, 4);
op->element_size = 4;
break;
case 103: /* lvx */
case 359: /* lvxl */
op->type = MKOP(LOAD_VMX, 0, 16);
op->element_size = 16;
break;
case 135: /* stvebx */
op->type = MKOP(STORE_VMX, 0, 1);
op->element_size = 1;
break;
case 167: /* stvehx */
op->type = MKOP(STORE_VMX, 0, 2);
op->element_size = 2;
break;
case 199: /* stvewx */
op->type = MKOP(STORE_VMX, 0, 4);
op->element_size = 4;
break;
case 231: /* stvx */
case 487: /* stvxl */
op->type = MKOP(STORE_VMX, 0, 16);