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MIPS: Compute branch returns for Cavium OCTEON specific branch instructions.

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For Cavium OCTEON, compute the return epc value for OCTEON specific
branch instructions.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2008-12-11 15:33:34 -08:00 committed by Ralf Baechle
parent 2a219b0eaa
commit 126336f065
1 changed files with 33 additions and 0 deletions
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33
arch/mips/kernel/branch.c
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@ -205,6 +205,39 @@ int __compute_return_epc(struct pt_regs *regs)
break;
}
break;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
case lwc2_op: /* This is bbit0 on Octeon */
if ((regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt))
== 0)
epc = epc + 4 + (insn.i_format.simmediate << 2);
else
epc += 8;
regs->cp0_epc = epc;
break;
case ldc2_op: /* This is bbit032 on Octeon */
if ((regs->regs[insn.i_format.rs] &
(1ull<<(insn.i_format.rt+32))) == 0)
epc = epc + 4 + (insn.i_format.simmediate << 2);
else
epc += 8;
regs->cp0_epc = epc;
break;
case swc2_op: /* This is bbit1 on Octeon */
if (regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt))
epc = epc + 4 + (insn.i_format.simmediate << 2);
else
epc += 8;
regs->cp0_epc = epc;
break;
case sdc2_op: /* This is bbit132 on Octeon */
if (regs->regs[insn.i_format.rs] &
(1ull<<(insn.i_format.rt+32)))
epc = epc + 4 + (insn.i_format.simmediate << 2);
else
epc += 8;
regs->cp0_epc = epc;
break;
#endif
}
return 0;