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| author | Mark Rutland <mark.rutland@arm.com> | 2018-07-05 16:16:50 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-07-05 18:24:13 +0200 |
| commit | 25dc2c80cfa33153057aa94984855acd57adf92a (patch) | |
| tree | 4986cc958d9e0c174b45807f5d9f8a970550923c /arch/arm64 | |
| parent | arm64: don't zero DIT on signal return (diff) | |
| download | linux-25dc2c80cfa33153057aa94984855acd57adf92a.tar.xz linux-25dc2c80cfa33153057aa94984855acd57adf92a.zip | |
arm64: compat: map SPSR_ELx<->PSR for signals
The SPSR_ELx format for exceptions taken from AArch32 differs from the
AArch32 PSR format. Thus, we must translate between the two when setting
up a compat sigframe, or restoring context from a compat sigframe.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Fixes: 7206dc93a58fb764 ("arm64: Expose Arm v8.4 features")
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Suzuki Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/signal32.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c index 77b91f478995..12aec0a66376 100644 --- a/arch/arm64/kernel/signal32.c +++ b/arch/arm64/kernel/signal32.c @@ -243,6 +243,7 @@ static int compat_restore_sigframe(struct pt_regs *regs, int err; sigset_t set; struct compat_aux_sigframe __user *aux; + unsigned long psr; err = get_sigset_t(&set, &sf->uc.uc_sigmask); if (err == 0) { @@ -266,7 +267,9 @@ static int compat_restore_sigframe(struct pt_regs *regs, __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); - __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + __get_user_error(psr, &sf->uc.uc_mcontext.arm_cpsr, err); + + regs->pstate = compat_psr_to_pstate(psr); /* * Avoid compat_sys_sigreturn() restarting. @@ -414,6 +417,7 @@ static int compat_setup_sigframe(struct compat_sigframe __user *sf, struct pt_regs *regs, sigset_t *set) { struct compat_aux_sigframe __user *aux; + unsigned long psr = pstate_to_compat_psr(regs->pstate); int err = 0; __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); @@ -432,7 +436,7 @@ static int compat_setup_sigframe(struct compat_sigframe __user *sf, __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); - __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + __put_user_error(psr, &sf->uc.uc_mcontext.arm_cpsr, err); __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); /* set the compat FSR WnR */ |