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MIPS: unaligned: Fix regular load/store instruction emulation for EVA 

When emulating a regular lh/lw/lhu/sh/sw we need to use the appropriate
instruction if we are in EVA mode. This is necessary for userspace
applications which trigger alignment exceptions. In such case, the
userspace load/store instruction needs to be emulated with the correct
eva/non-eva instruction by the kernel emulator.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Fixes: c1771216ab ("MIPS: kernel: unaligned: Handle unaligned accesses for EVA")
Cc: <stable@vger.kernel.org> # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9503/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2015-03-09 14:54:52 +00:00 committed by Ralf Baechle
parent 3563c32d65
commit 6eae35485b
1 changed files with 47 additions and 5 deletions
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52
arch/mips/kernel/unaligned.c
View File

@ -1023,7 +1023,15 @@ static void emulate_load_store_insn(struct pt_regs *regs,
if (!access_ok(VERIFY_READ, addr, 2))
goto sigbus;
LoadHW(addr, value, res);
if (config_enabled(CONFIG_EVA)) {
if (segment_eq(get_fs(), get_ds()))
LoadHW(addr, value, res);
else
LoadHWE(addr, value, res);
} else {
LoadHW(addr, value, res);
}
if (res)
goto fault;
compute_return_epc(regs);
@ -1034,7 +1042,15 @@ static void emulate_load_store_insn(struct pt_regs *regs,
if (!access_ok(VERIFY_READ, addr, 4))
goto sigbus;
LoadW(addr, value, res);
if (config_enabled(CONFIG_EVA)) {
if (segment_eq(get_fs(), get_ds()))
LoadW(addr, value, res);
else
LoadWE(addr, value, res);
} else {
LoadW(addr, value, res);
}
if (res)
goto fault;
compute_return_epc(regs);
@ -1045,7 +1061,15 @@ static void emulate_load_store_insn(struct pt_regs *regs,
if (!access_ok(VERIFY_READ, addr, 2))
goto sigbus;
LoadHWU(addr, value, res);
if (config_enabled(CONFIG_EVA)) {
if (segment_eq(get_fs(), get_ds()))
LoadHWU(addr, value, res);
else
LoadHWUE(addr, value, res);
} else {
LoadHWU(addr, value, res);
}
if (res)
goto fault;
compute_return_epc(regs);
@ -1104,7 +1128,16 @@ static void emulate_load_store_insn(struct pt_regs *regs,
compute_return_epc(regs);
value = regs->regs[insn.i_format.rt];
StoreHW(addr, value, res);
if (config_enabled(CONFIG_EVA)) {
if (segment_eq(get_fs(), get_ds()))
StoreHW(addr, value, res);
else
StoreHWE(addr, value, res);
} else {
StoreHW(addr, value, res);
}
if (res)
goto fault;
break;
@ -1115,7 +1148,16 @@ static void emulate_load_store_insn(struct pt_regs *regs,
compute_return_epc(regs);
value = regs->regs[insn.i_format.rt];
StoreW(addr, value, res);
if (config_enabled(CONFIG_EVA)) {
if (segment_eq(get_fs(), get_ds()))
StoreW(addr, value, res);
else
StoreWE(addr, value, res);
} else {
StoreW(addr, value, res);
}
if (res)
goto fault;
break;