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target-ppc: Allow little-endian user mode.

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This allows running PPC64 little-endian in user mode if target is configured
that way.  In PPC64 LE user mode we set MSR.LE during initialization.

Signed-off-by: Doug Kwan <dougkwan@google.com>
Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Doug Kwan 2014-05-29 09:12:20 -05:00 • committed by Alexander Graf
parent d90b94cd78
commit e22c357b3e
4 changed files with 92 additions and 96 deletions
Download patch file Download diff file Expand all files Collapse all files

26
target-ppc/mem_helper.c
View file

@ -25,6 +25,15 @@
//#define DEBUG_OP
static inline bool needs_byteswap(const CPUPPCState *env)
{
#if defined(TARGET_WORDS_BIGENDIAN)
return msr_le;
#else
return !msr_le;
#endif
}
/*****************************************************************************/
/* Memory load and stores */
@ -44,7 +53,7 @@ static inline target_ulong addr_add(CPUPPCState *env, target_ulong addr,
void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
for (; reg < 32; reg++) {
if (msr_le) {
if (needs_byteswap(env)) {
env->gpr[reg] = bswap32(cpu_ldl_data(env, addr));
} else {
env->gpr[reg] = cpu_ldl_data(env, addr);
@ -56,7 +65,7 @@ void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
for (; reg < 32; reg++) {
if (msr_le) {
if (needs_byteswap(env)) {
cpu_stl_data(env, addr, bswap32((uint32_t)env->gpr[reg]));
} else {
cpu_stl_data(env, addr, (uint32_t)env->gpr[reg]);
@ -199,6 +208,11 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
#define LO_IDX 0
#endif
/* We use msr_le to determine index ordering in a vector. However,
byteswapping is not simply controlled by msr_le. We also need to take
into account endianness of the target. This is done for the little-endian
PPC64 user-mode target. */
#define LVE(name, access, swap, element) \
void helper_##name(CPUPPCState *env, ppc_avr_t *r, \
target_ulong addr) \
@ -207,9 +221,11 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
int adjust = HI_IDX*(n_elems - 1); \
int sh = sizeof(r->element[0]) >> 1; \
int index = (addr & 0xf) >> sh; \
\
if (msr_le) { \
index = n_elems - index - 1; \
} \
\
if (needs_byteswap(env)) { \
r->element[LO_IDX ? index : (adjust - index)] = \
swap(access(env, addr)); \
} else { \
@ -232,9 +248,11 @@ LVE(lvewx, cpu_ldl_data, bswap32, u32)
int adjust = HI_IDX * (n_elems - 1); \
int sh = sizeof(r->element[0]) >> 1; \
int index = (addr & 0xf) >> sh; \
\
if (msr_le) { \
index = n_elems - index - 1; \
} \
\
if (needs_byteswap(env)) { \
access(env, addr, swap(r->element[LO_IDX ? index : \
(adjust - index)])); \
} else { \