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Diffstat (limited to 'arch/x86/ia32/ptrace32.c')
-rw-r--r--arch/x86/ia32/ptrace32.c404
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 000000000000..4a233ad6269c
--- /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;
+}
+
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