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linux-user/s390x: Handle vector regs in signal stack

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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210428193408.233706-16-richard.henderson@linaro.org>
[lv: fix indentation]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-04-28 12:34:08 -07:00 committed by Laurent Vivier
parent 79d6f2baa4
commit 0b16f04c1f
1 changed files with 60 additions and 2 deletions
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62
linux-user/s390x/signal.c
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@ -50,6 +50,12 @@ typedef struct {
target_s390_fp_regs fpregs;
} target_sigregs;
typedef struct {
uint64_t vxrs_low[16];
uint64_t vxrs_high[16][2];
uint8_t reserved[128];
} target_sigregs_ext;
typedef struct {
abi_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
abi_ulong sregs;
@ -60,15 +66,20 @@ typedef struct {
target_sigcontext sc;
target_sigregs sregs;
int signo;
target_sigregs_ext sregs_ext;
uint16_t retcode;
} sigframe;
#define TARGET_UC_VXRS 2
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
target_sigregs tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
target_sigset_t tuc_sigmask;
uint8_t reserved[128 - sizeof(target_sigset_t)];
target_sigregs_ext tuc_mcontext_ext;
};
typedef struct {
@ -128,6 +139,24 @@ static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
}
}
static void save_sigregs_ext(CPUS390XState *env, target_sigregs_ext *ext)
{
int i;
/*
* if (MACHINE_HAS_VX) ...
* That said, we always allocate the stack storage and the
* space is always available in env.
*/
for (i = 0; i < 16; ++i) {
__put_user(env->vregs[i][1], &ext->vxrs_low[i]);
}
for (i = 0; i < 16; ++i) {
__put_user(env->vregs[i + 16][0], &ext->vxrs_high[i][0]);
__put_user(env->vregs[i + 16][1], &ext->vxrs_high[i][1]);
}
}
void setup_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUS390XState *env)
{
@ -161,6 +190,9 @@ void setup_frame(int sig, struct target_sigaction *ka,
*/
__put_user(sig, &frame->signo);
/* Create sigregs_ext on the signal stack. */
save_sigregs_ext(env, &frame->sregs_ext);
/*
* Set up to return from userspace.
* If provided, use a stub already in userspace.
@ -202,6 +234,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
rt_sigframe *frame;
abi_ulong frame_addr;
abi_ulong restorer;
abi_ulong uc_flags;
frame_addr = get_sigframe(ka, env, sizeof *frame);
trace_user_setup_rt_frame(env, frame_addr);
@ -229,10 +262,15 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
tswap_siginfo(&frame->info, info);
/* Create ucontext on the signal stack. */
__put_user(0, &frame->uc.tuc_flags);
uc_flags = 0;
if (s390_has_feat(S390_FEAT_VECTOR)) {
uc_flags |= TARGET_UC_VXRS;
}
__put_user(uc_flags, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
target_save_altstack(&frame->uc.tuc_stack, env);
save_sigregs(env, &frame->uc.tuc_mcontext);
save_sigregs_ext(env, &frame->uc.tuc_mcontext_ext);
tswap_sigset(&frame->uc.tuc_sigmask, set);
/* Set up registers for signal handler */
@ -271,6 +309,24 @@ static void restore_sigregs(CPUS390XState *env, target_sigregs *sc)
}
}
static void restore_sigregs_ext(CPUS390XState *env, target_sigregs_ext *ext)
{
int i;
/*
* if (MACHINE_HAS_VX) ...
* That said, we always allocate the stack storage and the
* space is always available in env.
*/
for (i = 0; i < 16; ++i) {
__get_user(env->vregs[i][1], &ext->vxrs_low[i]);
}
for (i = 0; i < 16; ++i) {
__get_user(env->vregs[i + 16][0], &ext->vxrs_high[i][0]);
__get_user(env->vregs[i + 16][1], &ext->vxrs_high[i][1]);
}
}
long do_sigreturn(CPUS390XState *env)
{
sigframe *frame;
@ -292,6 +348,7 @@ long do_sigreturn(CPUS390XState *env)
set_sigmask(&set); /* ~_BLOCKABLE? */
restore_sigregs(env, &frame->sregs);
restore_sigregs_ext(env, &frame->sregs_ext);
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
@ -313,6 +370,7 @@ long do_rt_sigreturn(CPUS390XState *env)
set_sigmask(&set); /* ~_BLOCKABLE? */
restore_sigregs(env, &frame->uc.tuc_mcontext);
restore_sigregs_ext(env, &frame->uc.tuc_mcontext_ext);
target_restore_altstack(&frame->uc.tuc_stack, env);