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powerpc: Implement emulation of string loads and stores 

The size field of the op.type word is now the total number of bytes
to be loaded or stored.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Paul Mackerras 2014-09-02 14:35:09 +10:00 committed by Michael Ellerman
parent cf87c3f6b6
commit c9f6f4ed95
1 changed files with 49 additions and 10 deletions
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59
arch/powerpc/lib/sstep.c
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@ -1433,11 +1433,24 @@ int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs,
break;
#endif
case 533: /* lswx */
op->type = MKOP(LOAD_MULTI, 0, regs->xer & 0x7f);
break;
case 534: /* lwbrx */
op->type = MKOP(LOAD, BYTEREV, 4);
break;
case 597: /* lswi */
if (rb == 0)
rb = 32; /* # bytes to load */
op->type = MKOP(LOAD_MULTI, 0, rb);
op->ea = 0;
if (ra)
op->ea = truncate_if_32bit(regs->msr,
regs->gpr[ra]);
break;
#ifdef CONFIG_PPC_FPU
case 535: /* lfsx */
case 567: /* lfsux */
@ -1475,11 +1488,25 @@ int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs,
break;
#endif
case 661: /* stswx */
op->type = MKOP(STORE_MULTI, 0, regs->xer & 0x7f);
break;
case 662: /* stwbrx */
op->type = MKOP(STORE, BYTEREV, 4);
op->val = byterev_4(regs->gpr[rd]);
break;
case 725:
if (rb == 0)
rb = 32; /* # bytes to store */
op->type = MKOP(STORE_MULTI, 0, rb);
op->ea = 0;
if (ra)
op->ea = truncate_if_32bit(regs->msr,
regs->gpr[ra]);
break;
case 790: /* lhbrx */
op->type = MKOP(LOAD, BYTEREV, 2);
break;
@ -1553,15 +1580,14 @@ int __kprobes analyse_instr(struct instruction_op *op, struct pt_regs *regs,
break;
case 46: /* lmw */
ra = (instr >> 16) & 0x1f;
if (ra >= rd)
break; /* invalid form, ra in range to load */
op->type = MKOP(LOAD_MULTI, 0, 4);
op->type = MKOP(LOAD_MULTI, 0, 4 * (32 - rd));
op->ea = dform_ea(instr, regs);
break;
case 47: /* stmw */
op->type = MKOP(STORE_MULTI, 0, 4);
op->type = MKOP(STORE_MULTI, 0, 4 * (32 - rd));
op->ea = dform_ea(instr, regs);
break;
@ -1744,7 +1770,7 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
int r, err, size;
unsigned long val;
unsigned int cr;
int rd;
int i, rd, nb;
r = analyse_instr(&op, regs, instr);
if (r != 0)
@ -1866,12 +1892,18 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
if (regs->msr & MSR_LE)
return 0;
rd = op.reg;
do {
err = read_mem(&regs->gpr[rd], op.ea, 4, regs);
for (i = 0; i < size; i += 4) {
nb = size - i;
if (nb > 4)
nb = 4;
err = read_mem(&regs->gpr[rd], op.ea, nb, regs);
if (err)
return 0;
if (nb < 4) /* left-justify last bytes */
regs->gpr[rd] <<= 32 - 8 * nb;
op.ea += 4;
} while (++rd < 32);
++rd;
}
goto instr_done;
case STORE:
@ -1914,12 +1946,19 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
if (regs->msr & MSR_LE)
return 0;
rd = op.reg;
do {
err = write_mem(regs->gpr[rd], op.ea, 4, regs);
for (i = 0; i < size; i += 4) {
val = regs->gpr[rd];
nb = size - i;
if (nb > 4)
nb = 4;
else
val >>= 32 - 8 * nb;
err = write_mem(val, op.ea, nb, regs);
if (err)
return 0;
op.ea += 4;
} while (++rd < 32);
++rd;
}
goto instr_done;
case MFMSR: