diff options
Diffstat (limited to 'arch/arm/vfp/vfpmodule.c')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 9f476a1be2ca..01599c4ef726 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -266,7 +266,7 @@ void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs) * on VFP subarch 1. */ vfp_raise_exceptions(VFP_EXCEPTION_ERROR, trigger, fpscr, regs); - return; + goto exit; } /* @@ -297,7 +297,7 @@ void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs) * the FPEXC.FP2V bit is valid only if FPEXC.EX is 1. */ if (fpexc ^ (FPEXC_EX | FPEXC_FP2V)) - return; + goto exit; /* * The barrier() here prevents fpinst2 being read @@ -310,6 +310,8 @@ void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs) exceptions = vfp_emulate_instruction(trigger, orig_fpscr, regs); if (exceptions) vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs); + exit: + preempt_enable(); } static void vfp_enable(void *unused) @@ -377,6 +379,55 @@ static void vfp_pm_init(void) static inline void vfp_pm_init(void) { } #endif /* CONFIG_PM */ +/* + * Synchronise the hardware VFP state of a thread other than current with the + * saved one. This function is used by the ptrace mechanism. + */ +#ifdef CONFIG_SMP +void vfp_sync_state(struct thread_info *thread) +{ + /* + * On SMP systems, the VFP state is automatically saved at every + * context switch. We mark the thread VFP state as belonging to a + * non-existent CPU so that the saved one will be reloaded when + * needed. + */ + thread->vfpstate.hard.cpu = NR_CPUS; +} +#else +void vfp_sync_state(struct thread_info *thread) +{ + unsigned int cpu = get_cpu(); + u32 fpexc = fmrx(FPEXC); + + /* + * If VFP is enabled, the previous state was already saved and + * last_VFP_context updated. + */ + if (fpexc & FPEXC_EN) + goto out; + + if (!last_VFP_context[cpu]) + goto out; + + /* + * Save the last VFP state on this CPU. + */ + fmxr(FPEXC, fpexc | FPEXC_EN); + vfp_save_state(last_VFP_context[cpu], fpexc); + fmxr(FPEXC, fpexc); + + /* + * Set the context to NULL to force a reload the next time the thread + * uses the VFP. + */ + last_VFP_context[cpu] = NULL; + +out: + put_cpu(); +} +#endif + #include <linux/smp.h> /* @@ -427,6 +478,18 @@ static int __init vfp_init(void) * in place; report VFP support to userspace. */ elf_hwcap |= HWCAP_VFP; +#ifdef CONFIG_VFPv3 + if (VFP_arch >= 3) { + elf_hwcap |= HWCAP_VFPv3; + + /* + * Check for VFPv3 D16. CPUs in this configuration + * only have 16 x 64bit registers. + */ + if (((fmrx(MVFR0) & MVFR0_A_SIMD_MASK)) == 1) + elf_hwcap |= HWCAP_VFPv3D16; + } +#endif #ifdef CONFIG_NEON /* * Check for the presence of the Advanced SIMD |