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target/ppc: move FP and VMX registers into aligned vsr register array

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The VSX register array is a block of 64 128-bit registers where the first 32
registers consist of the existing 64-bit FP registers extended to 128-bit
using new VSR registers, and the last 32 registers are the VMX 128-bit
registers as show below:

            64-bit               64-bit
    +--------------------+--------------------+
    |        FP0         |                    |  VSR0
    +--------------------+--------------------+
    |        FP1         |                    |  VSR1
    +--------------------+--------------------+
    |        ...         |        ...         |  ...
    +--------------------+--------------------+
    |        FP30        |                    |  VSR30
    +--------------------+--------------------+
    |        FP31        |                    |  VSR31
    +--------------------+--------------------+
    |                  VMX0                   |  VSR32
    +-----------------------------------------+
    |                  VMX1                   |  VSR33
    +-----------------------------------------+
    |                  ...                    |  ...
    +-----------------------------------------+
    |                  VMX30                  |  VSR62
    +-----------------------------------------+
    |                  VMX31                  |  VSR63
    +-----------------------------------------+

In order to allow for future conversion of VSX instructions to use TCG vector
operations, recreate the same layout using an aligned version of the existing
vsr register array.

Since the old fpr and avr register arrays are removed, the existing callers
must also be updated to use the correct offset in the vsr register array. This
also includes switching the relevant VMState fields over to using subarrays
to make sure that migration is preserved.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Mark Cave-Ayland 2019-01-02 09:14:22 +00:00 • committed by David Gibson
parent 05ee3e8aa0
commit ef96e3ae96
13 changed files with 165 additions and 82 deletions
Download patch file Download diff file Expand all files Collapse all files

28
linux-user/ppc/signal.c
View file

@ -258,8 +258,8 @@ static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame)
/* Save Altivec registers if necessary. */
if (env->insns_flags & PPC_ALTIVEC) {
uint32_t *vrsave;
for (i = 0; i < ARRAY_SIZE(env->avr); i++) {
ppc_avr_t *avr = &env->avr[i];
for (i = 0; i < 32; i++) {
ppc_avr_t *avr = cpu_avr_ptr(env, i);
ppc_avr_t *vreg = (ppc_avr_t *)&frame->mc_vregs.altivec[i];
__put_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]);
@ -281,15 +281,17 @@ static void save_user_regs(CPUPPCState *env, struct target_mcontext *frame)
/* Save VSX second halves */
if (env->insns_flags2 & PPC2_VSX) {
uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34];
for (i = 0; i < ARRAY_SIZE(env->vsr); i++) {
__put_user(env->vsr[i], &vsregs[i]);
for (i = 0; i < 32; i++) {
uint64_t *vsrl = cpu_vsrl_ptr(env, i);
__put_user(*vsrl, &vsregs[i]);
}
}
/* Save floating point registers. */
if (env->insns_flags & PPC_FLOAT) {
for (i = 0; i < ARRAY_SIZE(env->fpr); i++) {
__put_user(env->fpr[i], &frame->mc_fregs[i]);
for (i = 0; i < 32; i++) {
uint64_t *fpr = cpu_fpr_ptr(env, i);
__put_user(*fpr, &frame->mc_fregs[i]);
}
__put_user((uint64_t) env->fpscr, &frame->mc_fregs[32]);
}
@ -373,8 +375,8 @@ static void restore_user_regs(CPUPPCState *env,
#else
v_regs = (ppc_avr_t *)frame->mc_vregs.altivec;
#endif
for (i = 0; i < ARRAY_SIZE(env->avr); i++) {
ppc_avr_t *avr = &env->avr[i];
for (i = 0; i < 32; i++) {
ppc_avr_t *avr = cpu_avr_ptr(env, i);
ppc_avr_t *vreg = &v_regs[i];
__get_user(avr->u64[PPC_VEC_HI], &vreg->u64[0]);
@ -393,16 +395,18 @@ static void restore_user_regs(CPUPPCState *env,
/* Restore VSX second halves */
if (env->insns_flags2 & PPC2_VSX) {
uint64_t *vsregs = (uint64_t *)&frame->mc_vregs.altivec[34];
for (i = 0; i < ARRAY_SIZE(env->vsr); i++) {
__get_user(env->vsr[i], &vsregs[i]);
for (i = 0; i < 32; i++) {
uint64_t *vsrl = cpu_vsrl_ptr(env, i);
__get_user(*vsrl, &vsregs[i]);
}
}
/* Restore floating point registers. */
if (env->insns_flags & PPC_FLOAT) {
uint64_t fpscr;
for (i = 0; i < ARRAY_SIZE(env->fpr); i++) {
__get_user(env->fpr[i], &frame->mc_fregs[i]);
for (i = 0; i < 32; i++) {
uint64_t *fpr = cpu_fpr_ptr(env, i);
__get_user(*fpr, &frame->mc_fregs[i]);
}
__get_user(fpscr, &frame->mc_fregs[32]);
env->fpscr = (uint32_t) fpscr;