From: Tom Hughes <tom@compton.nu>
Date: Sat, 11 Feb 2006 16:26:46 +0000 (+0000)
Subject: Implement the vm86 and vm86old system calls based on a patch
X-Git-Tag: svn/VALGRIND_3_2_0~279
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c2633355ff45d4fdd0222e45ac48826109d0b80;p=thirdparty%2Fvalgrind.git

Implement the vm86 and vm86old system calls based on a patch
from Alper Akcan. Fixes bug #118939.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5635
---

diff --git a/coregrind/m_syswrap/syswrap-x86-linux.c b/coregrind/m_syswrap/syswrap-x86-linux.c
index 8f1ecf5119..e277efe779 100644
--- a/coregrind/m_syswrap/syswrap-x86-linux.c
+++ b/coregrind/m_syswrap/syswrap-x86-linux.c
@@ -772,6 +772,8 @@ DECL_TEMPLATE(x86_linux, sys_get_thread_area);
 DECL_TEMPLATE(x86_linux, sys_ptrace);
 DECL_TEMPLATE(x86_linux, sys_sigaction);
 DECL_TEMPLATE(x86_linux, old_select);
+DECL_TEMPLATE(x86_linux, sys_vm86old);
+DECL_TEMPLATE(x86_linux, sys_vm86);
 DECL_TEMPLATE(x86_linux, sys_syscall223);
 
 PRE(old_select)
@@ -1677,6 +1679,32 @@ POST(sys_sigaction)
       POST_MEM_WRITE( ARG3, sizeof(struct vki_old_sigaction));
 }
 
+PRE(sys_vm86old)
+{
+   PRINT("sys_vm86old ( %p )", ARG1);
+   PRE_REG_READ1(int, "vm86old", struct vm86_struct *, info);
+   PRE_MEM_WRITE( "vm86old(info)", ARG1, sizeof(struct vki_vm86_struct));
+}
+
+POST(sys_vm86old)
+{
+   POST_MEM_WRITE( ARG1, sizeof(struct vki_vm86_struct));
+}
+
+PRE(sys_vm86)
+{
+   PRINT("sys_vm86 ( %d, %p )", ARG1,ARG2);
+   PRE_REG_READ2(int, "vm86", unsigned long, fn, struct vm86plus_struct *, v86);
+   if (ARG1 == VKI_VM86_ENTER || ARG1 == VKI_VM86_ENTER_NO_BYPASS)
+      PRE_MEM_WRITE( "vm86(v86)", ARG2, sizeof(struct vki_vm86plus_struct));
+}
+
+POST(sys_vm86)
+{
+   if (ARG1 == VKI_VM86_ENTER || ARG1 == VKI_VM86_ENTER_NO_BYPASS)
+      POST_MEM_WRITE( ARG2, sizeof(struct vki_vm86plus_struct));
+}
+
 
 /* ---------------------------------------------------------------
    PRE/POST wrappers for x86/Linux-variant specific syscalls
@@ -1869,7 +1897,7 @@ const SyscallTableEntry ML_(syscall_table)[] = {
    GENX_(__NR_iopl,              sys_iopl),           // 110
    LINX_(__NR_vhangup,           sys_vhangup),        // 111
    GENX_(__NR_idle,              sys_ni_syscall),     // 112
-//zz    //   (__NR_vm86old,           sys_vm86old),        // 113 x86/Linux-only
+   PLAXY(__NR_vm86old,           sys_vm86old),        // 113 x86/Linux-only
    GENXY(__NR_wait4,             sys_wait4),          // 114
 //zz 
 //zz    //   (__NR_swapoff,           sys_swapoff),        // 115 */Linux 
@@ -1935,7 +1963,7 @@ const SyscallTableEntry ML_(syscall_table)[] = {
    LINX_(__NR_setresuid,         sys_setresuid16),    // 164
 
    LINXY(__NR_getresuid,         sys_getresuid16),    // 165
-//zz    //   (__NR_vm86,              sys_vm86),           // 166 x86/Linux-only
+   PLAXY(__NR_vm86,              sys_vm86),           // 166 x86/Linux-only
    GENX_(__NR_query_module,      sys_ni_syscall),     // 167
    GENXY(__NR_poll,              sys_poll),           // 168
 //zz    //   (__NR_nfsservctl,        sys_nfsservctl),     // 169 */Linux
diff --git a/include/vki-x86-linux.h b/include/vki-x86-linux.h
index 3efc9649cf..eb1c99edac 100644
--- a/include/vki-x86-linux.h
+++ b/include/vki-x86-linux.h
@@ -785,6 +785,80 @@ struct vki_shminfo64 {
 #define VKI_PTRACE_GETFPXREGS         18
 #define VKI_PTRACE_SETFPXREGS         19
 
+//----------------------------------------------------------------------
+// From linux-2.6.15.4/include/asm-i386/vm86.h
+//----------------------------------------------------------------------
+
+#define VKI_VM86_PLUS_INSTALL_CHECK	0
+#define VKI_VM86_ENTER			1
+#define VKI_VM86_ENTER_NO_BYPASS	2
+#define	VKI_VM86_REQUEST_IRQ		3
+#define VKI_VM86_FREE_IRQ		4
+#define VKI_VM86_GET_IRQ_BITS		5
+#define VKI_VM86_GET_AND_RESET_IRQ	6
+
+struct vki_vm86_regs {
+/*
+ * normal regs, with special meaning for the segment descriptors..
+ */
+	long ebx;
+	long ecx;
+	long edx;
+	long esi;
+	long edi;
+	long ebp;
+	long eax;
+	long __null_ds;
+	long __null_es;
+	long __null_fs;
+	long __null_gs;
+	long orig_eax;
+	long eip;
+	unsigned short cs, __csh;
+	long eflags;
+	long esp;
+	unsigned short ss, __ssh;
+/*
+ * these are specific to v86 mode:
+ */
+	unsigned short es, __esh;
+	unsigned short ds, __dsh;
+	unsigned short fs, __fsh;
+	unsigned short gs, __gsh;
+};
+
+struct vki_revectored_struct {
+	unsigned long __map[8];			/* 256 bits */
+};
+
+struct vki_vm86_struct {
+	struct vki_vm86_regs regs;
+	unsigned long flags;
+	unsigned long screen_bitmap;
+	unsigned long cpu_type;
+	struct vki_revectored_struct int_revectored;
+	struct vki_revectored_struct int21_revectored;
+};
+
+struct vki_vm86plus_info_struct {
+	unsigned long force_return_for_pic:1;
+	unsigned long vm86dbg_active:1;       /* for debugger */
+	unsigned long vm86dbg_TFpendig:1;     /* for debugger */
+	unsigned long unused:28;
+	unsigned long is_vm86pus:1;	      /* for vm86 internal use */
+	unsigned char vm86dbg_intxxtab[32];   /* for debugger */
+};
+
+struct vki_vm86plus_struct {
+	struct vki_vm86_regs regs;
+	unsigned long flags;
+	unsigned long screen_bitmap;
+	unsigned long cpu_type;
+	struct vki_revectored_struct int_revectored;
+	struct vki_revectored_struct int21_revectored;
+	struct vki_vm86plus_info_struct vm86plus;
+};
+
 //----------------------------------------------------------------------
 // And that's it!
 //----------------------------------------------------------------------