x86: x86 ia32 ptrace arch merge

This moves the sys32_ptrace code into arch/x86/kernel/ptrace.c,
verbatim except for a few hard-coded sizes replaced with sizeof.
Here this code can use the shared local functions in this file.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/ptrace.c

@@ -636,6 +636,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 
 #ifdef CONFIG_IA32_EMULATION
 
+#include <linux/compat.h>
+#include <linux/syscalls.h>
+#include <asm/ia32.h>
+#include <asm/fpu32.h>
 #include <asm/user32.h>
 
 #define R32(l,q)							\
@@ -758,6 +762,216 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
 #undef R32
 #undef SEG32
 
+static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
+{
+	siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
+	compat_siginfo_t __user *si32 = compat_ptr(data);
+	siginfo_t ssi;
+	int ret;
+
+	if (request == PTRACE_SETSIGINFO) {
+		memset(&ssi, 0, sizeof(siginfo_t));
+		ret = copy_siginfo_from_user32(&ssi, si32);
+		if (ret)
+			return ret;
+		if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
+			return -EFAULT;
+	}
+	ret = sys_ptrace(request, pid, addr, (unsigned long)si);
+	if (ret)
+		return ret;
+	if (request == PTRACE_GETSIGINFO) {
+		if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
+			return -EFAULT;
+		ret = copy_siginfo_to_user32(si32, &ssi);
+	}
+	return ret;
+}
+
+asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
+{
+	struct task_struct *child;
+	struct pt_regs *childregs;
+	void __user *datap = compat_ptr(data);
+	int ret;
+	__u32 val;
+
+	switch (request) {
+	case PTRACE_TRACEME:
+	case PTRACE_ATTACH:
+	case PTRACE_KILL:
+	case PTRACE_CONT:
+	case PTRACE_SINGLESTEP:
+	case PTRACE_SINGLEBLOCK:
+	case PTRACE_DETACH:
+	case PTRACE_SYSCALL:
+	case PTRACE_OLDSETOPTIONS:
+	case PTRACE_SETOPTIONS:
+	case PTRACE_SET_THREAD_AREA:
+	case PTRACE_GET_THREAD_AREA:
+		return sys_ptrace(request, pid, addr, data);
+
+	default:
+		return -EINVAL;
+
+	case PTRACE_PEEKTEXT:
+	case PTRACE_PEEKDATA:
+	case PTRACE_POKEDATA:
+	case PTRACE_POKETEXT:
+	case PTRACE_POKEUSR:
+	case PTRACE_PEEKUSR:
+	case PTRACE_GETREGS:
+	case PTRACE_SETREGS:
+	case PTRACE_SETFPREGS:
+	case PTRACE_GETFPREGS:
+	case PTRACE_SETFPXREGS:
+	case PTRACE_GETFPXREGS:
+	case PTRACE_GETEVENTMSG:
+		break;
+
+	case PTRACE_SETSIGINFO:
+	case PTRACE_GETSIGINFO:
+		return ptrace32_siginfo(request, pid, addr, data);
+	}
+
+	child = ptrace_get_task_struct(pid);
+	if (IS_ERR(child))
+		return PTR_ERR(child);
+
+	ret = ptrace_check_attach(child, request == PTRACE_KILL);
+	if (ret < 0)
+		goto out;
+
+	childregs = task_pt_regs(child);
+
+	switch (request) {
+	case PTRACE_PEEKDATA:
+	case PTRACE_PEEKTEXT:
+		ret = 0;
+		if (access_process_vm(child, addr, &val, sizeof(u32), 0) !=
+		    sizeof(u32))
+			ret = -EIO;
+		else
+			ret = put_user(val, (unsigned int __user *)datap);
+		break;
+
+	case PTRACE_POKEDATA:
+	case PTRACE_POKETEXT:
+		ret = 0;
+		if (access_process_vm(child, addr, &data, sizeof(u32), 1) !=
+		    sizeof(u32))
+			ret = -EIO;
+		break;
+
+	case PTRACE_PEEKUSR:
+		ret = getreg32(child, addr, &val);
+		if (ret == 0)
+			ret = put_user(val, (__u32 __user *)datap);
+		break;
+
+	case PTRACE_POKEUSR:
+		ret = putreg32(child, addr, data);
+		break;
+
+	case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+		int i;
+
+		if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
+			ret = -EIO;
+			break;
+		}
+		ret = 0;
+		for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(__u32)) {
+			getreg32(child, i, &val);
+			ret |= __put_user(val, (u32 __user *)datap);
+			datap += sizeof(u32);
+		}
+		break;
+	}
+
+	case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+		unsigned long tmp;
+		int i;
+
+		if (!access_ok(VERIFY_READ, datap, 16*4)) {
+			ret = -EIO;
+			break;
+		}
+		ret = 0;
+		for (i = 0; i < sizeof(struct user_regs_struct32); i += sizeof(u32)) {
+			ret |= __get_user(tmp, (u32 __user *)datap);
+			putreg32(child, i, tmp);
+			datap += sizeof(u32);
+		}
+		break;
+	}
+
+	case PTRACE_GETFPREGS:
+		ret = -EIO;
+		if (!access_ok(VERIFY_READ, compat_ptr(data),
+			       sizeof(struct user_i387_struct)))
+			break;
+		save_i387_ia32(child, datap, childregs, 1);
+		ret = 0;
+			break;
+
+	case PTRACE_SETFPREGS:
+		ret = -EIO;
+		if (!access_ok(VERIFY_WRITE, datap,
+			       sizeof(struct user_i387_struct)))
+			break;
+		ret = 0;
+		/* don't check EFAULT to be bug-to-bug compatible to i386 */
+		restore_i387_ia32(child, datap, 1);
+		break;
+
+	case PTRACE_GETFPXREGS: {
+		struct user32_fxsr_struct __user *u = datap;
+
+		init_fpu(child);
+		ret = -EIO;
+		if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
+			break;
+			ret = -EFAULT;
+		if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
+			break;
+		ret = __put_user(childregs->cs, &u->fcs);
+		ret |= __put_user(child->thread.ds, &u->fos);
+		break;
+	}
+	case PTRACE_SETFPXREGS: {
+		struct user32_fxsr_struct __user *u = datap;
+
+		unlazy_fpu(child);
+		ret = -EIO;
+		if (!access_ok(VERIFY_READ, u, sizeof(*u)))
+			break;
+		/*
+		 * no checking to be bug-to-bug compatible with i386.
+		 * but silence warning
+		 */
+		if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
+			;
+		set_stopped_child_used_math(child);
+		child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+		ret = 0;
+		break;
+	}
+
+	case PTRACE_GETEVENTMSG:
+		ret = put_user(child->ptrace_message,
+			       (unsigned int __user *)compat_ptr(data));
+		break;
+
+	default:
+		BUG();
+	}
+
+ out:
+	put_task_struct(child);
+	return ret;
+}
+
 #endif	/* CONFIG_IA32_EMULATION */
 
 #ifdef CONFIG_X86_32