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-rw-r--r--arch/arm/include/asm/elf.h1
-rw-r--r--arch/arm/include/asm/ptrace.h6
-rw-r--r--arch/arm/kernel/ptrace.c348
3 files changed, 246 insertions, 109 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h
index c3cd8755e648..0e9ce8d9686e 100644
--- a/arch/arm/include/asm/elf.h
+++ b/arch/arm/include/asm/elf.h
@@ -108,6 +108,7 @@ struct task_struct;
int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs);
#define ELF_CORE_COPY_TASK_REGS dump_task_regs
+#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE 4096
/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index a8ff22b2a391..312d10877bd7 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -128,6 +128,12 @@ struct pt_regs {
#define ARM_r0 uregs[0]
#define ARM_ORIG_r0 uregs[17]
+/*
+ * The size of the user-visible VFP state as seen by PTRACE_GET/SETVFPREGS
+ * and core dumps.
+ */
+#define ARM_VFPREGS_SIZE ( 32 * 8 /*fpregs*/ + 4 /*fpscr*/ )
+
#ifdef __KERNEL__
#define user_mode(regs) \
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 8182f45ca493..97260060bf26 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -21,6 +21,7 @@
#include <linux/uaccess.h>
#include <linux/perf_event.h>
#include <linux/hw_breakpoint.h>
+#include <linux/regset.h>
#include <asm/pgtable.h>
#include <asm/system.h>
@@ -308,58 +309,6 @@ static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
return put_user_reg(tsk, off >> 2, val);
}
-/*
- * Get all user integer registers.
- */
-static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
-{
- struct pt_regs *regs = task_pt_regs(tsk);
-
- return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
-}
-
-/*
- * Set all user integer registers.
- */
-static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
-{
- struct pt_regs newregs;
- int ret;
-
- ret = -EFAULT;
- if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
- struct pt_regs *regs = task_pt_regs(tsk);
-
- ret = -EINVAL;
- if (valid_user_regs(&newregs)) {
- *regs = newregs;
- ret = 0;
- }
- }
-
- return ret;
-}
-
-/*
- * Get the child FPU state.
- */
-static int ptrace_getfpregs(struct task_struct *tsk, void __user *ufp)
-{
- return copy_to_user(ufp, &task_thread_info(tsk)->fpstate,
- sizeof(struct user_fp)) ? -EFAULT : 0;
-}
-
-/*
- * Set the child FPU state.
- */
-static int ptrace_setfpregs(struct task_struct *tsk, void __user *ufp)
-{
- struct thread_info *thread = task_thread_info(tsk);
- thread->used_cp[1] = thread->used_cp[2] = 1;
- return copy_from_user(&thread->fpstate, ufp,
- sizeof(struct user_fp)) ? -EFAULT : 0;
-}
-
#ifdef CONFIG_IWMMXT
/*
@@ -418,56 +367,6 @@ 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_hwstate(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_hwstate(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;
-
- vfp_flush_hwstate(thread);
-
- return 0;
-}
-#endif
-
#ifdef CONFIG_HAVE_HW_BREAKPOINT
/*
* Convert a virtual register number into an index for a thread_info
@@ -694,6 +593,219 @@ out:
}
#endif
+/* regset get/set implementations */
+
+static int gpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs,
+ 0, sizeof(*regs));
+}
+
+static int gpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct pt_regs newregs;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &newregs,
+ 0, sizeof(newregs));
+ if (ret)
+ return ret;
+
+ if (!valid_user_regs(&newregs))
+ return -EINVAL;
+
+ *task_pt_regs(target) = newregs;
+ return 0;
+}
+
+static int fpa_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &task_thread_info(target)->fpstate,
+ 0, sizeof(struct user_fp));
+}
+
+static int fpa_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct thread_info *thread = task_thread_info(target);
+
+ thread->used_cp[1] = thread->used_cp[2] = 1;
+
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &thread->fpstate,
+ 0, sizeof(struct user_fp));
+}
+
+#ifdef CONFIG_VFP
+/*
+ * VFP register get/set implementations.
+ *
+ * With respect to the kernel, struct user_fp is divided into three chunks:
+ * 16 or 32 real VFP registers (d0-d15 or d0-31)
+ * These are transferred to/from the real registers in the task's
+ * vfp_hard_struct. The number of registers depends on the kernel
+ * configuration.
+ *
+ * 16 or 0 fake VFP registers (d16-d31 or empty)
+ * i.e., the user_vfp structure has space for 32 registers even if
+ * the kernel doesn't have them all.
+ *
+ * vfp_get() reads this chunk as zero where applicable
+ * vfp_set() ignores this chunk
+ *
+ * 1 word for the FPSCR
+ *
+ * The bounds-checking logic built into user_regset_copyout and friends
+ * means that we can make a simple sequence of calls to map the relevant data
+ * to/from the specified slice of the user regset structure.
+ */
+static int vfp_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ int ret;
+ struct thread_info *thread = task_thread_info(target);
+ struct vfp_hard_struct const *vfp = &thread->vfpstate.hard;
+ const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+ const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+ vfp_sync_hwstate(thread);
+
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &vfp->fpregs,
+ user_fpregs_offset,
+ user_fpregs_offset + sizeof(vfp->fpregs));
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ user_fpregs_offset + sizeof(vfp->fpregs),
+ user_fpscr_offset);
+ if (ret)
+ return ret;
+
+ return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ &vfp->fpscr,
+ user_fpscr_offset,
+ user_fpscr_offset + sizeof(vfp->fpscr));
+}
+
+/*
+ * For vfp_set() a read-modify-write is done on the VFP registers,
+ * in order to avoid writing back a half-modified set of registers on
+ * failure.
+ */
+static int vfp_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct thread_info *thread = task_thread_info(target);
+ struct vfp_hard_struct new_vfp = thread->vfpstate.hard;
+ const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+ const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &new_vfp.fpregs,
+ user_fpregs_offset,
+ user_fpregs_offset + sizeof(new_vfp.fpregs));
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ user_fpregs_offset + sizeof(new_vfp.fpregs),
+ user_fpscr_offset);
+ if (ret)
+ return ret;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ &new_vfp.fpscr,
+ user_fpscr_offset,
+ user_fpscr_offset + sizeof(new_vfp.fpscr));
+ if (ret)
+ return ret;
+
+ vfp_sync_hwstate(thread);
+ thread->vfpstate.hard = new_vfp;
+ vfp_flush_hwstate(thread);
+
+ return 0;
+}
+#endif /* CONFIG_VFP */
+
+enum arm_regset {
+ REGSET_GPR,
+ REGSET_FPR,
+#ifdef CONFIG_VFP
+ REGSET_VFP,
+#endif
+};
+
+static const struct user_regset arm_regsets[] = {
+ [REGSET_GPR] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = gpr_get,
+ .set = gpr_set
+ },
+ [REGSET_FPR] = {
+ /*
+ * For the FPA regs in fpstate, the real fields are a mixture
+ * of sizes, so pretend that the registers are word-sized:
+ */
+ .core_note_type = NT_PRFPREG,
+ .n = sizeof(struct user_fp) / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = fpa_get,
+ .set = fpa_set
+ },
+#ifdef CONFIG_VFP
+ [REGSET_VFP] = {
+ /*
+ * Pretend that the VFP regs are word-sized, since the FPSCR is
+ * a single word dangling at the end of struct user_vfp:
+ */
+ .core_note_type = NT_ARM_VFP,
+ .n = ARM_VFPREGS_SIZE / sizeof(u32),
+ .size = sizeof(u32),
+ .align = sizeof(u32),
+ .get = vfp_get,
+ .set = vfp_set
+ },
+#endif /* CONFIG_VFP */
+};
+
+static const struct user_regset_view user_arm_view = {
+ .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
+ .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_arm_view;
+}
+
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
@@ -710,19 +822,31 @@ long arch_ptrace(struct task_struct *child, long request,
break;
case PTRACE_GETREGS:
- ret = ptrace_getregs(child, datap);
+ ret = copy_regset_to_user(child,
+ &user_arm_view, REGSET_GPR,
+ 0, sizeof(struct pt_regs),
+ datap);
break;
case PTRACE_SETREGS:
- ret = ptrace_setregs(child, datap);
+ ret = copy_regset_from_user(child,
+ &user_arm_view, REGSET_GPR,
+ 0, sizeof(struct pt_regs),
+ datap);
break;
case PTRACE_GETFPREGS:
- ret = ptrace_getfpregs(child, datap);
+ ret = copy_regset_to_user(child,
+ &user_arm_view, REGSET_FPR,
+ 0, sizeof(union fp_state),
+ datap);
break;
-
+
case PTRACE_SETFPREGS:
- ret = ptrace_setfpregs(child, datap);
+ ret = copy_regset_from_user(child,
+ &user_arm_view, REGSET_FPR,
+ 0, sizeof(union fp_state),
+ datap);
break;
#ifdef CONFIG_IWMMXT
@@ -757,11 +881,17 @@ long arch_ptrace(struct task_struct *child, long request,
#ifdef CONFIG_VFP
case PTRACE_GETVFPREGS:
- ret = ptrace_getvfpregs(child, datap);
+ ret = copy_regset_to_user(child,
+ &user_arm_view, REGSET_VFP,
+ 0, ARM_VFPREGS_SIZE,
+ datap);
break;
case PTRACE_SETVFPREGS:
- ret = ptrace_setvfpregs(child, datap);
+ ret = copy_regset_from_user(child,
+ &user_arm_view, REGSET_VFP,
+ 0, ARM_VFPREGS_SIZE,
+ datap);
break;
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 10:21:19 +0000