diff options
| -rw-r--r-- | arch/arm/include/asm/ptrace.h | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/thread_info.h | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/user.h | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/ptrace.c | 58 | ||||
| -rw-r--r-- | arch/arm/vfp/vfp.h | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 2 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 49 |
7 files changed, 120 insertions, 4 deletions
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 7319261..236a06b 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -27,6 +27,8 @@ /* PTRACE_SYSCALL is 24 */ #define PTRACE_GETCRUNCHREGS 25 #define PTRACE_SETCRUNCHREGS 26 +#define PTRACE_GETVFPREGS 27 +#define PTRACE_SETVFPREGS 28 /* * PSR bits diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 68b9ec8..b9dc8a8 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -113,6 +113,8 @@ extern void iwmmxt_task_restore(struct thread_info *, void *); extern void iwmmxt_task_release(struct thread_info *); extern void iwmmxt_task_switch(struct thread_info *); +extern void vfp_sync_state(struct thread_info *thread); + #endif /* diff --git a/arch/arm/include/asm/user.h b/arch/arm/include/asm/user.h index 825c1e7..df95e05 100644 --- a/arch/arm/include/asm/user.h +++ b/arch/arm/include/asm/user.h @@ -81,4 +81,13 @@ struct user{ #define HOST_TEXT_START_ADDR (u.start_code) #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG) +/* + * User specific VFP registers. If only VFPv2 is present, registers 16 to 31 + * are ignored by the ptrace system call. + */ +struct user_vfp { + unsigned long long fpregs[32]; + unsigned long fpscr; +}; + #endif /* _ARM_USER_H */ diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index df653ea..89882a1 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -653,6 +653,54 @@ static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) } #endif +#ifdef CONFIG_VFP +/* + * Get the child VFP state. + */ +static int ptrace_getvfpregs(struct task_struct *tsk, void __user *data) +{ + struct thread_info *thread = task_thread_info(tsk); + union vfp_state *vfp = &thread->vfpstate; + struct user_vfp __user *ufp = data; + + vfp_sync_state(thread); + + /* copy the floating point registers */ + if (copy_to_user(&ufp->fpregs, &vfp->hard.fpregs, + sizeof(vfp->hard.fpregs))) + return -EFAULT; + + /* copy the status and control register */ + if (put_user(vfp->hard.fpscr, &ufp->fpscr)) + return -EFAULT; + + return 0; +} + +/* + * Set the child VFP state. + */ +static int ptrace_setvfpregs(struct task_struct *tsk, void __user *data) +{ + struct thread_info *thread = task_thread_info(tsk); + union vfp_state *vfp = &thread->vfpstate; + struct user_vfp __user *ufp = data; + + vfp_sync_state(thread); + + /* copy the floating point registers */ + if (copy_from_user(&vfp->hard.fpregs, &ufp->fpregs, + sizeof(vfp->hard.fpregs))) + return -EFAULT; + + /* copy the status and control register */ + if (get_user(vfp->hard.fpscr, &ufp->fpscr)) + return -EFAULT; + + return 0; +} +#endif + long arch_ptrace(struct task_struct *child, long request, long addr, long data) { int ret; @@ -775,6 +823,16 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) break; #endif +#ifdef CONFIG_VFP + case PTRACE_GETVFPREGS: + ret = ptrace_getvfpregs(child, (void __user *)data); + break; + + case PTRACE_SETVFPREGS: + ret = ptrace_setvfpregs(child, (void __user *)data); + break; +#endif + default: ret = ptrace_request(child, request, addr, data); break; diff --git a/arch/arm/vfp/vfp.h b/arch/arm/vfp/vfp.h index 8de86e4..c8c98dd4 100644 --- a/arch/arm/vfp/vfp.h +++ b/arch/arm/vfp/vfp.h @@ -377,6 +377,4 @@ struct op { u32 flags; }; -#if defined(CONFIG_SMP) || defined(CONFIG_PM) extern void vfp_save_state(void *location, u32 fpexc); -#endif diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index c92a08b..a5a4e57 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -172,7 +172,6 @@ process_exception: @ retry the faulted instruction ENDPROC(vfp_support_entry) -#if defined(CONFIG_SMP) || defined(CONFIG_PM) ENTRY(vfp_save_state) @ Save the current VFP state @ r0 - save location @@ -190,7 +189,6 @@ ENTRY(vfp_save_state) stmia r0, {r1, r2, r3, r12} @ save FPEXC, FPSCR, FPINST, FPINST2 mov pc, lr ENDPROC(vfp_save_state) -#endif last_VFP_context_address: .word last_VFP_context diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 9f476a1..7e12390 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -377,6 +377,55 @@ 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> /* |
