x86_64: move ia32

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 404 insertions, 0 deletions

diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c
new file mode 100644
index 00000000000..4a233ad6269
--- /dev/null
+++ b/arch/x86/ia32/ptrace32.c
@@ -0,0 +1,404 @@
+/* 
+ * 32bit ptrace for x86-64.
+ *
+ * Copyright 2001,2002 Andi Kleen, SuSE Labs.
+ * Some parts copied from arch/i386/kernel/ptrace.c. See that file for earlier 
+ * copyright.
+ * 
+ * This allows to access 64bit processes too; but there is no way to see the extended 
+ * register contents.
+ */ 
+
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/unistd.h>
+#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/ptrace.h>
+#include <asm/ptrace.h>
+#include <asm/compat.h>
+#include <asm/uaccess.h>
+#include <asm/user32.h>
+#include <asm/user.h>
+#include <asm/errno.h>
+#include <asm/debugreg.h>
+#include <asm/i387.h>
+#include <asm/fpu32.h>
+#include <asm/ia32.h>
+
+/*
+ * Determines which flags the user has access to [1 = access, 0 = no access].
+ * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
+ * Also masks reserved bits (31-22, 15, 5, 3, 1).
+ */
+#define FLAG_MASK 0x54dd5UL
+
+#define R32(l,q) \
+	case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
+
+static int putreg32(struct task_struct *child, unsigned regno, u32 val)
+{
+	int i;
+	__u64 *stack = (__u64 *)task_pt_regs(child);
+
+	switch (regno) {
+	case offsetof(struct user32, regs.fs):
+		if (val && (val & 3) != 3) return -EIO; 
+		child->thread.fsindex = val & 0xffff;
+		break;
+	case offsetof(struct user32, regs.gs):
+		if (val && (val & 3) != 3) return -EIO; 
+		child->thread.gsindex = val & 0xffff;
+		break;
+	case offsetof(struct user32, regs.ds):
+		if (val && (val & 3) != 3) return -EIO; 
+		child->thread.ds = val & 0xffff;
+		break;
+	case offsetof(struct user32, regs.es):
+		child->thread.es = val & 0xffff;
+		break;
+	case offsetof(struct user32, regs.ss): 
+		if ((val & 3) != 3) return -EIO;
+        	stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
+		break;
+	case offsetof(struct user32, regs.cs): 
+		if ((val & 3) != 3) return -EIO;
+		stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
+		break;
+
+	R32(ebx, rbx); 
+	R32(ecx, rcx);
+	R32(edx, rdx);
+	R32(edi, rdi);
+	R32(esi, rsi);
+	R32(ebp, rbp);
+	R32(eax, rax);
+	R32(orig_eax, orig_rax);
+	R32(eip, rip);
+	R32(esp, rsp);
+
+	case offsetof(struct user32, regs.eflags): {
+		__u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
+		val &= FLAG_MASK;
+		*flags = val | (*flags & ~FLAG_MASK);
+		break;
+	}
+
+	case offsetof(struct user32, u_debugreg[4]): 
+	case offsetof(struct user32, u_debugreg[5]):
+		return -EIO;
+
+	case offsetof(struct user32, u_debugreg[0]):
+		child->thread.debugreg0 = val;
+		break;
+
+	case offsetof(struct user32, u_debugreg[1]):
+		child->thread.debugreg1 = val;
+		break;
+
+	case offsetof(struct user32, u_debugreg[2]):
+		child->thread.debugreg2 = val;
+		break;
+
+	case offsetof(struct user32, u_debugreg[3]):
+		child->thread.debugreg3 = val;
+		break;
+
+	case offsetof(struct user32, u_debugreg[6]):
+		child->thread.debugreg6 = val;
+		break; 
+
+	case offsetof(struct user32, u_debugreg[7]):
+		val &= ~DR_CONTROL_RESERVED;
+		/* See arch/i386/kernel/ptrace.c for an explanation of
+		 * this awkward check.*/
+		for(i=0; i<4; i++)
+			if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
+			       return -EIO;
+		child->thread.debugreg7 = val; 
+		if (val)
+			set_tsk_thread_flag(child, TIF_DEBUG);
+		else
+			clear_tsk_thread_flag(child, TIF_DEBUG);
+		break; 
+		    
+	default:
+		if (regno > sizeof(struct user32) || (regno & 3))
+			return -EIO;
+	       
+		/* Other dummy fields in the virtual user structure are ignored */ 
+		break; 		
+	}
+	return 0;
+}
+
+#undef R32
+
+#define R32(l,q) \
+	case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
+
+static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
+{
+	__u64 *stack = (__u64 *)task_pt_regs(child);
+
+	switch (regno) {
+	case offsetof(struct user32, regs.fs):
+	        *val = child->thread.fsindex;
+		break;
+	case offsetof(struct user32, regs.gs):
+		*val = child->thread.gsindex;
+		break;
+	case offsetof(struct user32, regs.ds):
+		*val = child->thread.ds;
+		break;
+	case offsetof(struct user32, regs.es):
+		*val = child->thread.es;
+		break;
+
+	R32(cs, cs);
+	R32(ss, ss);
+	R32(ebx, rbx); 
+	R32(ecx, rcx);
+	R32(edx, rdx);
+	R32(edi, rdi);
+	R32(esi, rsi);
+	R32(ebp, rbp);
+	R32(eax, rax);
+	R32(orig_eax, orig_rax);
+	R32(eip, rip);
+	R32(eflags, eflags);
+	R32(esp, rsp);
+
+	case offsetof(struct user32, u_debugreg[0]): 
+		*val = child->thread.debugreg0; 
+		break; 
+	case offsetof(struct user32, u_debugreg[1]): 
+		*val = child->thread.debugreg1; 
+		break; 
+	case offsetof(struct user32, u_debugreg[2]): 
+		*val = child->thread.debugreg2; 
+		break; 
+	case offsetof(struct user32, u_debugreg[3]): 
+		*val = child->thread.debugreg3; 
+		break; 
+	case offsetof(struct user32, u_debugreg[6]): 
+		*val = child->thread.debugreg6; 
+		break; 
+	case offsetof(struct user32, u_debugreg[7]): 
+		*val = child->thread.debugreg7; 
+		break; 
+		    
+	default:
+		if (regno > sizeof(struct user32) || (regno & 3))
+			return -EIO;
+
+		/* Other dummy fields in the virtual user structure are ignored */ 
+		*val = 0;
+		break; 		
+	}
+	return 0;
+}
+
+#undef R32
+
+static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
+{
+	int ret;
+	compat_siginfo_t __user *si32 = compat_ptr(data);
+	siginfo_t ssi; 
+	siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
+	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_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 <= 16*4 ; 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 <= 16*4; 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;
+}
+