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i386-arch.c
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i386-arch.c
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#include <server.h>
#include <breakpoints.h>
#include <sys/stat.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include "x86-linux-ptrace.h"
#include "x86-arch.h"
typedef struct
{
int slot;
int insn_size;
gboolean update_ip;
guint32 code_address;
guint32 original_eip;
} CodeBufferData;
struct ArchInfo
{
INFERIOR_REGS_TYPE current_regs;
INFERIOR_FPREGS_TYPE current_fpregs;
GPtrArray *callback_stack;
CodeBufferData *code_buffer;
guint64 dr_control, dr_status;
int dr_regs [DR_NADDR];
};
typedef struct
{
INFERIOR_REGS_TYPE saved_regs;
INFERIOR_FPREGS_TYPE saved_fpregs;
guint64 callback_argument;
guint32 call_address;
guint32 stack_pointer;
guint32 rti_frame;
guint32 exc_address;
guint32 pushed_registers;
guint32 data_pointer;
guint32 data_size;
int saved_signal;
gboolean debug;
gboolean is_rti;
} CallbackData;
ArchInfo *
x86_arch_initialize (void)
{
ArchInfo *arch = g_new0 (ArchInfo, 1);
arch->callback_stack = g_ptr_array_new ();
return arch;
}
void
x86_arch_finalize (ArchInfo *arch)
{
g_ptr_array_free (arch->callback_stack, TRUE);
g_free (arch);
}
static ServerCommandError
server_ptrace_current_insn_is_bpt (ServerHandle *handle, guint32 *is_breakpoint)
{
mono_debugger_breakpoint_manager_lock ();
if (mono_debugger_breakpoint_manager_lookup (handle->bpm, INFERIOR_REG_EIP (handle->arch->current_regs)))
*is_breakpoint = TRUE;
else
*is_breakpoint = FALSE;
mono_debugger_breakpoint_manager_unlock ();
return COMMAND_ERROR_NONE;
}
void
x86_arch_remove_breakpoints_from_target_memory (ServerHandle *handle, guint64 start,
guint32 size, gpointer buffer)
{
GPtrArray *breakpoints;
guint8 *ptr = buffer;
int i;
mono_debugger_breakpoint_manager_lock ();
breakpoints = mono_debugger_breakpoint_manager_get_breakpoints (handle->bpm);
for (i = 0; i < breakpoints->len; i++) {
BreakpointInfo *info = g_ptr_array_index (breakpoints, i);
guint32 offset;
if (info->is_hardware_bpt || !info->enabled)
continue;
if ((info->address < start) || (info->address >= start+size))
continue;
offset = (guint32) info->address - start;
ptr [offset] = info->saved_insn;
}
mono_debugger_breakpoint_manager_unlock ();
}
static ServerCommandError
server_ptrace_get_frame (ServerHandle *handle, StackFrame *frame)
{
ServerCommandError result;
result = x86_arch_get_registers (handle);
if (result != COMMAND_ERROR_NONE)
return result;
frame->address = (guint32) INFERIOR_REG_EIP (handle->arch->current_regs);
frame->stack_pointer = (guint32) INFERIOR_REG_ESP (handle->arch->current_regs);
frame->frame_address = (guint32) INFERIOR_REG_EBP (handle->arch->current_regs);
return COMMAND_ERROR_NONE;
}
/*
* This method is highly architecture and specific.
* It will only work on the i386.
*/
static ServerCommandError
server_ptrace_call_method (ServerHandle *handle, guint64 method_address,
guint64 method_argument1, guint64 method_argument2,
guint64 callback_argument)
{
ServerCommandError result = COMMAND_ERROR_NONE;
ArchInfo *arch = handle->arch;
guint32 new_esp, call_disp;
CallbackData *cdata;
guint8 code[] = { 0x68, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00,
0x00, 0x00, 0x68, 0x00, 0x00, 0x00, 0x00, 0x68,
0x00, 0x00, 0x00, 0x00, 0xe8, 0x00, 0x00, 0x00,
0x00, 0xcc };
int size = sizeof (code);
cdata = g_new0 (CallbackData, 1);
new_esp = (guint32) INFERIOR_REG_ESP (arch->current_regs) - size;
memcpy (&cdata->saved_regs, &arch->current_regs, sizeof (arch->current_regs));
memcpy (&cdata->saved_fpregs, &arch->current_fpregs, sizeof (arch->current_fpregs));
cdata->call_address = new_esp + 26;
cdata->stack_pointer = new_esp - 16;
cdata->callback_argument = callback_argument;
cdata->saved_signal = handle->inferior->last_signal;
handle->inferior->last_signal = 0;
call_disp = (int) method_address - new_esp;
*((guint32 *) (code+1)) = method_argument2 >> 32;
*((guint32 *) (code+6)) = method_argument2 & 0xffffffff;
*((guint32 *) (code+11)) = method_argument1 >> 32;
*((guint32 *) (code+16)) = method_argument1 & 0xffffffff;
*((guint32 *) (code+21)) = call_disp - 25;
result = server_ptrace_write_memory (handle, (guint32) new_esp, size, code);
if (result != COMMAND_ERROR_NONE)
return result;
INFERIOR_REG_ORIG_EAX (arch->current_regs) = -1;
INFERIOR_REG_ESP (arch->current_regs) = INFERIOR_REG_EIP (arch->current_regs) = new_esp;
g_ptr_array_add (arch->callback_stack, cdata);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return server_ptrace_continue (handle);
}
/*
* This method is highly architecture and specific.
* It will only work on the i386.
*/
static ServerCommandError
server_ptrace_call_method_1 (ServerHandle *handle, guint64 method_address,
guint64 method_argument, guint64 data_argument,
guint64 data_argument2, const gchar *string_argument,
guint64 callback_argument)
{
ServerCommandError result = COMMAND_ERROR_NONE;
ArchInfo *arch = handle->arch;
guint32 new_esp, call_disp;
CallbackData *cdata;
static guint8 static_code[] = { 0x68, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00,
0x00, 0x00, 0x68, 0x00, 0x00, 0x00, 0x00, 0x68,
0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x00,
0x00, 0x68, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00,
0x00, 0x00, 0x00, 0xe8, 0x00, 0x00, 0x00, 0x00,
0xcc };
int static_size = sizeof (static_code);
int size = static_size + strlen (string_argument) + 1;
guint8 *code = g_malloc0 (size);
memcpy (code, static_code, static_size);
strcpy ((char *) (code + static_size), string_argument);
cdata = g_new0 (CallbackData, 1);
new_esp = (guint32) INFERIOR_REG_ESP (arch->current_regs) - size;
memcpy (&cdata->saved_regs, &arch->current_regs, sizeof (arch->current_regs));
memcpy (&cdata->saved_fpregs, &arch->current_fpregs, sizeof (arch->current_fpregs));
cdata->call_address = new_esp + static_size;
cdata->stack_pointer = new_esp - 28;
cdata->callback_argument = callback_argument;
cdata->saved_signal = handle->inferior->last_signal;
handle->inferior->last_signal = 0;
call_disp = (int) method_address - new_esp;
*((guint32 *) (code+1)) = new_esp + static_size;
*((guint32 *) (code+6)) = data_argument2 >> 32;
*((guint32 *) (code+11)) = data_argument2 & 0xffffffff;
*((guint32 *) (code+16)) = data_argument >> 32;
*((guint32 *) (code+21)) = data_argument & 0xffffffff;
*((guint32 *) (code+26)) = method_argument >> 32;
*((guint32 *) (code+31)) = method_argument & 0xffffffff;
*((guint32 *) (code+36)) = call_disp - 40;
result = server_ptrace_write_memory (handle, (guint32) new_esp, size, code);
if (result != COMMAND_ERROR_NONE)
return result;
INFERIOR_REG_ORIG_EAX (arch->current_regs) = -1;
INFERIOR_REG_ESP (arch->current_regs) = INFERIOR_REG_EIP (arch->current_regs) = new_esp;
g_ptr_array_add (arch->callback_stack, cdata);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return server_ptrace_continue (handle);
}
static ServerCommandError
server_ptrace_call_method_2 (ServerHandle *handle, guint64 method_address,
guint32 data_size, gconstpointer data_buffer,
guint64 callback_argument)
{
ServerCommandError result = COMMAND_ERROR_NONE;
ArchInfo *arch = handle->arch;
CallbackData *cdata;
guint32 new_esp;
int size = 57 + data_size;
guint8 *code = g_malloc0 (size);
new_esp = INFERIOR_REG_ESP (arch->current_regs) - size;
*((guint32 *) code) = new_esp + size - 1;
*((guint64 *) (code+4)) = new_esp + 20;
*((guint64 *) (code+12)) = new_esp + 56;
*((guint32 *) (code+20)) = INFERIOR_REG_EAX (arch->current_regs);
*((guint32 *) (code+24)) = INFERIOR_REG_EBX (arch->current_regs);
*((guint32 *) (code+28)) = INFERIOR_REG_ECX (arch->current_regs);
*((guint32 *) (code+32)) = INFERIOR_REG_EDX (arch->current_regs);
*((guint32 *) (code+36)) = INFERIOR_REG_EBP (arch->current_regs);
*((guint32 *) (code+40)) = INFERIOR_REG_ESP (arch->current_regs);
*((guint32 *) (code+44)) = INFERIOR_REG_ESI (arch->current_regs);
*((guint32 *) (code+48)) = INFERIOR_REG_EDI (arch->current_regs);
*((guint32 *) (code+52)) = INFERIOR_REG_EIP (arch->current_regs);
*((guint8 *) (code+data_size+56)) = 0xcc;
cdata = g_new0 (CallbackData, 1);
memcpy (&cdata->saved_regs, &arch->current_regs, sizeof (arch->current_regs));
memcpy (&cdata->saved_fpregs, &arch->current_fpregs, sizeof (arch->current_fpregs));
cdata->call_address = new_esp + size;
cdata->stack_pointer = new_esp + 4;
cdata->exc_address = 0;
cdata->callback_argument = callback_argument;
cdata->saved_signal = handle->inferior->last_signal;
cdata->pushed_registers = new_esp + 4;
handle->inferior->last_signal = 0;
if (data_size > 0) {
memcpy (code+56, data_buffer, data_size);
cdata->data_pointer = new_esp + 56;
cdata->data_size = data_size;
}
result = server_ptrace_write_memory (handle, (guint32) new_esp, size, code);
g_free (code);
if (result != COMMAND_ERROR_NONE)
return result;
INFERIOR_REG_ORIG_EAX (arch->current_regs) = -1;
INFERIOR_REG_EIP (arch->current_regs) = method_address;
INFERIOR_REG_ESP (arch->current_regs) = new_esp;
g_ptr_array_add (arch->callback_stack, cdata);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return server_ptrace_continue (handle);
}
static ServerCommandError
server_ptrace_call_method_3 (ServerHandle *handle, guint64 method_address,
guint64 method_argument, guint64 address_argument,
guint32 blob_size, gconstpointer blob_data,
guint64 callback_argument)
{
ServerCommandError result = COMMAND_ERROR_NONE;
ArchInfo *arch = handle->arch;
CallbackData *cdata;
guint32 new_esp;
int i;
static guint8 static_code[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xcc };
int static_size = sizeof (static_code);
int size = static_size + blob_size;
guint8 *code = g_malloc0 (size);
guint32 *ptr = (guint32 *) (code + static_size + blob_size);
guint32 effective_address;
guint32 blob_start;
memcpy (code, static_code, static_size);
memcpy (code + static_size, blob_data, blob_size);
new_esp = INFERIOR_REG_ESP (arch->current_regs) - size;
blob_start = new_esp + static_size;
effective_address = address_argument ? address_argument : blob_start;
*((guint32 *) code) = new_esp + static_size - 1;
*((guint32 *) (code+4)) = method_argument;
*((guint32 *) (code+12)) = effective_address;
*((guint32 *) (code+20)) = new_esp;
cdata = g_new0 (CallbackData, 1);
memcpy (&cdata->saved_regs, &arch->current_regs, sizeof (arch->current_regs));
memcpy (&cdata->saved_fpregs, &arch->current_fpregs, sizeof (arch->current_fpregs));
cdata->call_address = new_esp + static_size;
cdata->stack_pointer = new_esp + 4;
cdata->callback_argument = callback_argument;
cdata->saved_signal = handle->inferior->last_signal;
handle->inferior->last_signal = 0;
result = server_ptrace_write_memory (handle, (unsigned long) new_esp, size, code);
g_free (code);
if (result != COMMAND_ERROR_NONE)
return result;
INFERIOR_REG_ORIG_EAX (arch->current_regs) = -1;
INFERIOR_REG_EIP (arch->current_regs) = method_address;
INFERIOR_REG_ESP (arch->current_regs) = new_esp;
INFERIOR_REG_EBP (arch->current_regs) = 0;
g_ptr_array_add (arch->callback_stack, cdata);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return server_ptrace_continue (handle);
}
static ServerCommandError
server_ptrace_call_method_invoke (ServerHandle *handle, guint64 invoke_method,
guint64 method_argument, guint32 num_params,
guint32 blob_size, guint64 *param_data,
gint32 *offset_data, gconstpointer blob_data,
guint64 callback_argument, gboolean debug)
{
ServerCommandError result = COMMAND_ERROR_NONE;
ArchInfo *arch = handle->arch;
CallbackData *cdata;
guint32 new_esp;
int i;
static guint8 static_code[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xcc };
int static_size = sizeof (static_code);
int size = static_size + (num_params + 3) * 4 + blob_size;
guint8 *code = g_malloc0 (size);
guint32 *ptr = (guint32 *) (code + static_size + blob_size);
guint64 blob_start;
memcpy (code, static_code, static_size);
memcpy (code + static_size, blob_data, blob_size);
new_esp = (guint32) INFERIOR_REG_ESP (arch->current_regs) - size;
blob_start = new_esp + static_size;
for (i = 0; i < num_params; i++) {
if (offset_data [i] >= 0)
ptr [i] = blob_start + offset_data [i];
else
ptr [i] = param_data [i];
}
*((guint32 *) code) = new_esp + static_size - 1;
*((guint32 *) (code+4)) = method_argument;
*((guint32 *) (code+8)) = ptr [0];
*((guint32 *) (code+12)) = new_esp + static_size + blob_size + 4;
*((guint32 *) (code+16)) = new_esp + 20;
cdata = g_new0 (CallbackData, 1);
memcpy (&cdata->saved_regs, &arch->current_regs, sizeof (arch->current_regs));
memcpy (&cdata->saved_fpregs, &arch->current_fpregs, sizeof (arch->current_fpregs));
cdata->call_address = new_esp + static_size;
cdata->stack_pointer = new_esp + 4;
cdata->exc_address = new_esp + 20;
cdata->callback_argument = callback_argument;
cdata->debug = debug;
cdata->is_rti = TRUE;
cdata->saved_signal = handle->inferior->last_signal;
handle->inferior->last_signal = 0;
result = server_ptrace_write_memory (handle, (guint32) new_esp, size, code);
g_free (code);
if (result != COMMAND_ERROR_NONE)
return result;
INFERIOR_REG_ORIG_EAX (arch->current_regs) = -1;
INFERIOR_REG_EIP (arch->current_regs) = invoke_method;
INFERIOR_REG_ESP (arch->current_regs) = new_esp;
INFERIOR_REG_EBP (arch->current_regs) = 0;
g_ptr_array_add (arch->callback_stack, cdata);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return server_ptrace_continue (handle);
}
static gboolean
check_breakpoint (ServerHandle *handle, guint64 address, guint64 *retval)
{
BreakpointInfo *info;
mono_debugger_breakpoint_manager_lock ();
info = (BreakpointInfo *) mono_debugger_breakpoint_manager_lookup (handle->bpm, address);
if (!info || !info->enabled) {
mono_debugger_breakpoint_manager_unlock ();
return FALSE;
}
*retval = info->id;
mono_debugger_breakpoint_manager_unlock ();
return TRUE;
}
static CallbackData *
get_callback_data (ArchInfo *arch)
{
if (!arch->callback_stack->len)
return NULL;
return g_ptr_array_index (arch->callback_stack, arch->callback_stack->len - 1);
}
static ServerCommandError
x86_arch_get_registers (ServerHandle *handle)
{
ServerCommandError result;
result = _server_ptrace_get_registers (handle->inferior, &handle->arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
result = _server_ptrace_get_fp_registers (handle->inferior, &handle->arch->current_fpregs);
if (result != COMMAND_ERROR_NONE)
return result;
result = _server_ptrace_get_dr (handle->inferior, DR_STATUS, &handle->arch->dr_status);
if (result != COMMAND_ERROR_NONE)
return result;
return COMMAND_ERROR_NONE;
}
ChildStoppedAction
x86_arch_child_stopped (ServerHandle *handle, int stopsig,
guint64 *callback_arg, guint64 *retval, guint64 *retval2,
guint32 *opt_data_size, gpointer *opt_data)
{
ArchInfo *arch = handle->arch;
InferiorHandle *inferior = handle->inferior;
CodeBufferData *cbuffer = NULL;
CallbackData *cdata;
guint64 code;
int i;
x86_arch_get_registers (handle);
if (stopsig == SIGSTOP)
return STOP_ACTION_INTERRUPTED;
#if defined(__linux__) || defined(__FreeBSD__)
if (stopsig != SIGTRAP)
return STOP_ACTION_STOPPED;
#endif
if (handle->mono_runtime &&
((guint32) INFERIOR_REG_EIP (arch->current_regs) - 1 == handle->mono_runtime->notification_address)) {
guint32 addr = (guint32) INFERIOR_REG_ESP (arch->current_regs) + 4;
guint64 data [3];
if (stopsig != SIGTRAP)
return STOP_ACTION_STOPPED;
if (server_ptrace_read_memory (handle, addr, 24, &data))
return STOP_ACTION_STOPPED;
*callback_arg = data [0];
*retval = data [1];
*retval2 = data [2];
return STOP_ACTION_NOTIFICATION;
}
for (i = 0; i < DR_NADDR; i++) {
if (X86_DR_WATCH_HIT (arch, i)) {
_server_ptrace_set_dr (inferior, DR_STATUS, 0);
arch->dr_status = 0;
*retval = arch->dr_regs [i];
return STOP_ACTION_BREAKPOINT_HIT;
}
}
if (check_breakpoint (handle, (guint32) INFERIOR_REG_EIP (arch->current_regs) - 1, retval)) {
INFERIOR_REG_EIP (arch->current_regs)--;
_server_ptrace_set_registers (inferior, &arch->current_regs);
return STOP_ACTION_BREAKPOINT_HIT;
}
cdata = get_callback_data (arch);
if (cdata && (cdata->call_address == INFERIOR_REG_EIP (arch->current_regs))) {
guint64 exc_object;
if (cdata->pushed_registers) {
guint32 pushed_regs [9];
if (_server_ptrace_read_memory (handle, cdata->pushed_registers, 36, &pushed_regs))
g_error (G_STRLOC ": Can't restore registers after returning from a call");
INFERIOR_REG_EAX (cdata->saved_regs) = pushed_regs [0];
INFERIOR_REG_EBX (cdata->saved_regs) = pushed_regs [1];
INFERIOR_REG_ECX (cdata->saved_regs) = pushed_regs [2];
INFERIOR_REG_EDX (cdata->saved_regs) = pushed_regs [3];
INFERIOR_REG_EBP (cdata->saved_regs) = pushed_regs [4];
INFERIOR_REG_ESP (cdata->saved_regs) = pushed_regs [5];
INFERIOR_REG_ESI (cdata->saved_regs) = pushed_regs [6];
INFERIOR_REG_EDI (cdata->saved_regs) = pushed_regs [7];
INFERIOR_REG_EIP (cdata->saved_regs) = pushed_regs [8];
}
if (_server_ptrace_set_registers (inferior, &cdata->saved_regs) != COMMAND_ERROR_NONE)
g_error (G_STRLOC ": Can't restore registers after returning from a call");
if (_server_ptrace_set_fp_registers (inferior, &cdata->saved_fpregs) != COMMAND_ERROR_NONE)
g_error (G_STRLOC ": Can't restore FP registers after returning from a call");
*callback_arg = cdata->callback_argument;
*retval = (guint32) INFERIOR_REG_EAX (arch->current_regs);
if (cdata->data_pointer) {
*opt_data_size = cdata->data_size;
*opt_data = g_malloc0 (cdata->data_size);
if (_server_ptrace_read_memory (
handle, cdata->data_pointer, cdata->data_size, *opt_data))
g_error (G_STRLOC ": Can't read data buffer after returning from a call");
} else {
*opt_data_size = 0;
*opt_data = NULL;
}
if (cdata->exc_address &&
(server_ptrace_peek_word (handle, cdata->exc_address, &exc_object) != COMMAND_ERROR_NONE))
g_error (G_STRLOC ": Can't get exc object");
*retval2 = (guint32) exc_object;
inferior->last_signal = cdata->saved_signal;
g_ptr_array_remove (arch->callback_stack, cdata);
x86_arch_get_registers (handle);
if (cdata->is_rti) {
g_free (cdata);
return STOP_ACTION_RTI_DONE;
}
if (cdata->debug) {
*retval = 0;
g_free (cdata);
return STOP_ACTION_CALLBACK_COMPLETED;
}
g_free (cdata);
return STOP_ACTION_CALLBACK;
}
cbuffer = arch->code_buffer;
if (cbuffer) {
handle->mono_runtime->executable_code_bitfield [cbuffer->slot] = 0;
if (cbuffer->code_address + cbuffer->insn_size != INFERIOR_REG_EIP (arch->current_regs)) {
g_warning (G_STRLOC ": %x - %x,%d - %x - %x", cbuffer->original_eip,
cbuffer->code_address, cbuffer->insn_size,
cbuffer->code_address + cbuffer->insn_size,
INFERIOR_REG_EIP (arch->current_regs));
return STOP_ACTION_STOPPED;
}
INFERIOR_REG_EIP (arch->current_regs) = cbuffer->original_eip;
if (cbuffer->update_ip)
INFERIOR_REG_EIP (arch->current_regs) += cbuffer->insn_size;
if (_server_ptrace_set_registers (inferior, &arch->current_regs) != COMMAND_ERROR_NONE) {
g_error (G_STRLOC ": Can't restore registers");
}
g_free (cbuffer);
arch->code_buffer = NULL;
return STOP_ACTION_STOPPED;
}
if (server_ptrace_peek_word (handle, GPOINTER_TO_SIZE (INFERIOR_REG_EIP (arch->current_regs) - 1), &code) != COMMAND_ERROR_NONE)
return STOP_ACTION_STOPPED;
if ((code & 0xff) == 0xcc) {
*retval = 0;
return STOP_ACTION_BREAKPOINT_HIT;
}
return STOP_ACTION_STOPPED;
}
static ServerCommandError
server_ptrace_get_target_info (guint32 *target_int_size, guint32 *target_long_size,
guint32 *target_address_size, guint32 *is_bigendian)
{
*target_int_size = sizeof (guint32);
*target_long_size = sizeof (guint32);
*target_address_size = sizeof (void *);
*is_bigendian = 0;
return COMMAND_ERROR_NONE;
}
static ServerCommandError
server_ptrace_get_registers (ServerHandle *handle, guint64 *values)
{
ArchInfo *arch = handle->arch;
values [DEBUGGER_REG_RBX] = (guint32) INFERIOR_REG_EBX (arch->current_regs);
values [DEBUGGER_REG_RCX] = (guint32) INFERIOR_REG_ECX (arch->current_regs);
values [DEBUGGER_REG_RDX] = (guint32) INFERIOR_REG_EDX (arch->current_regs);
values [DEBUGGER_REG_RSI] = (guint32) INFERIOR_REG_ESI (arch->current_regs);
values [DEBUGGER_REG_RDI] = (guint32) INFERIOR_REG_EDI (arch->current_regs);
values [DEBUGGER_REG_RBP] = (guint32) INFERIOR_REG_EBP (arch->current_regs);
values [DEBUGGER_REG_RAX] = (guint32) INFERIOR_REG_EAX (arch->current_regs);
values [DEBUGGER_REG_DS] = (guint32) INFERIOR_REG_DS (arch->current_regs);
values [DEBUGGER_REG_ES] = (guint32) INFERIOR_REG_ES (arch->current_regs);
values [DEBUGGER_REG_FS] = (guint32) INFERIOR_REG_FS (arch->current_regs);
values [DEBUGGER_REG_GS] = (guint32) INFERIOR_REG_GS (arch->current_regs);
values [DEBUGGER_REG_RIP] = (guint32) INFERIOR_REG_EIP (arch->current_regs);
values [DEBUGGER_REG_CS] = (guint32) INFERIOR_REG_CS (arch->current_regs);
values [DEBUGGER_REG_EFLAGS] = (guint32) INFERIOR_REG_EFLAGS (arch->current_regs);
values [DEBUGGER_REG_RSP] = (guint32) INFERIOR_REG_ESP (arch->current_regs);
values [DEBUGGER_REG_SS] = (guint32) INFERIOR_REG_SS (arch->current_regs);
return COMMAND_ERROR_NONE;
}
static ServerCommandError
server_ptrace_set_registers (ServerHandle *handle, guint64 *values)
{
ArchInfo *arch = handle->arch;
INFERIOR_REG_EBX (arch->current_regs) = values [DEBUGGER_REG_RBX];
INFERIOR_REG_ECX (arch->current_regs) = values [DEBUGGER_REG_RCX];
INFERIOR_REG_EDX (arch->current_regs) = values [DEBUGGER_REG_RDX];
INFERIOR_REG_ESI (arch->current_regs) = values [DEBUGGER_REG_RSI];
INFERIOR_REG_EDI (arch->current_regs) = values [DEBUGGER_REG_RDI];
INFERIOR_REG_EBP (arch->current_regs) = values [DEBUGGER_REG_RBP];
INFERIOR_REG_EAX (arch->current_regs) = values [DEBUGGER_REG_RAX];
INFERIOR_REG_DS (arch->current_regs) = values [DEBUGGER_REG_DS];
INFERIOR_REG_ES (arch->current_regs) = values [DEBUGGER_REG_ES];
INFERIOR_REG_FS (arch->current_regs) = values [DEBUGGER_REG_FS];
INFERIOR_REG_GS (arch->current_regs) = values [DEBUGGER_REG_GS];
INFERIOR_REG_EIP (arch->current_regs) = values [DEBUGGER_REG_RIP];
INFERIOR_REG_CS (arch->current_regs) = values [DEBUGGER_REG_CS];
INFERIOR_REG_EFLAGS (arch->current_regs) = values [DEBUGGER_REG_EFLAGS];
INFERIOR_REG_ESP (arch->current_regs) = values [DEBUGGER_REG_RSP];
INFERIOR_REG_SS (arch->current_regs) = values [DEBUGGER_REG_SS];
return _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
}
static ServerCommandError
server_ptrace_push_registers (ServerHandle *handle, guint64 *new_esp)
{
ArchInfo *arch = handle->arch;
ServerCommandError result;
INFERIOR_REG_ESP (arch->current_regs) -= sizeof (arch->current_regs);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
*new_esp = INFERIOR_REG_ESP (arch->current_regs);
result = server_ptrace_write_memory (
handle, *new_esp, sizeof (arch->current_regs), &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return COMMAND_ERROR_NONE;
}
static ServerCommandError
server_ptrace_pop_registers (ServerHandle *handle)
{
ArchInfo *arch = handle->arch;
ServerCommandError result;
INFERIOR_REG_ESP (arch->current_regs) += sizeof (arch->current_regs);
result = _server_ptrace_set_registers (handle->inferior, &arch->current_regs);
if (result != COMMAND_ERROR_NONE)
return result;
return COMMAND_ERROR_NONE;
}
static void
server_ptrace_get_registers_from_core_file (guint64 *values, const guint8 *buffer)
{
INFERIOR_REGS_TYPE regs = * (INFERIOR_REGS_TYPE *) buffer;
values [DEBUGGER_REG_RBX] = (guint32) INFERIOR_REG_EBX (regs);
values [DEBUGGER_REG_RCX] = (guint32) INFERIOR_REG_ECX (regs);
values [DEBUGGER_REG_RDX] = (guint32) INFERIOR_REG_EDX (regs);
values [DEBUGGER_REG_RSI] = (guint32) INFERIOR_REG_ESI (regs);
values [DEBUGGER_REG_RDI] = (guint32) INFERIOR_REG_EDI (regs);
values [DEBUGGER_REG_RBP] = (guint32) INFERIOR_REG_EBP (regs);
values [DEBUGGER_REG_RAX] = (guint32) INFERIOR_REG_EAX (regs);
values [DEBUGGER_REG_DS] = (guint32) INFERIOR_REG_DS (regs);
values [DEBUGGER_REG_ES] = (guint32) INFERIOR_REG_ES (regs);
values [DEBUGGER_REG_FS] = (guint32) INFERIOR_REG_FS (regs);
values [DEBUGGER_REG_GS] = (guint32) INFERIOR_REG_GS (regs);
values [DEBUGGER_REG_RIP] = (guint32) INFERIOR_REG_EIP (regs);
values [DEBUGGER_REG_CS] = (guint32) INFERIOR_REG_CS (regs);
values [DEBUGGER_REG_EFLAGS] = (guint32) INFERIOR_REG_EFLAGS (regs);
values [DEBUGGER_REG_RSP] = (guint32) INFERIOR_REG_ESP (regs);
values [DEBUGGER_REG_SS] = (guint32) INFERIOR_REG_SS (regs);
}
static int
find_breakpoint_table_slot (MonoRuntimeInfo *runtime)
{
int i;
for (i = 1; i < runtime->breakpoint_table_size; i++) {
if (runtime->breakpoint_table_bitfield [i])
continue;
runtime->breakpoint_table_bitfield [i] = 1;
return i;
}
return -1;
}
static ServerCommandError
runtime_info_enable_breakpoint (ServerHandle *handle, BreakpointInfo *breakpoint)
{
MonoRuntimeInfo *runtime;
ServerCommandError result;
guint64 table_address, index_address;
int slot;
runtime = handle->mono_runtime;
g_assert (runtime);
slot = find_breakpoint_table_slot (runtime);
if (slot < 0)
return COMMAND_ERROR_INTERNAL_ERROR;
breakpoint->runtime_table_slot = slot;
table_address = runtime->breakpoint_info_area + 8 * slot;
index_address = runtime->breakpoint_table + 4 * slot;
result = server_ptrace_poke_word (handle, table_address, breakpoint->address);
if (result != COMMAND_ERROR_NONE)
return result;
result = server_ptrace_poke_word (handle, table_address + 4, (gsize) breakpoint->saved_insn);
if (result != COMMAND_ERROR_NONE)
return result;
result = server_ptrace_poke_word (handle, index_address, (gsize) slot);
if (result != COMMAND_ERROR_NONE)
return result;
return COMMAND_ERROR_NONE;
}
static ServerCommandError
runtime_info_disable_breakpoint (ServerHandle *handle, BreakpointInfo *breakpoint)
{
MonoRuntimeInfo *runtime;
ServerCommandError result;
guint64 index_address;
int slot;
runtime = handle->mono_runtime;
g_assert (runtime);
slot = breakpoint->runtime_table_slot;
index_address = runtime->breakpoint_table + runtime->address_size * slot;
result = server_ptrace_poke_word (handle, index_address, 0);
if (result != COMMAND_ERROR_NONE)
return result;
runtime->breakpoint_table_bitfield [slot] = 0;
return COMMAND_ERROR_NONE;
}
static ServerCommandError
x86_arch_enable_breakpoint (ServerHandle *handle, BreakpointInfo *breakpoint)
{
ServerCommandError result;
ArchInfo *arch = handle->arch;
InferiorHandle *inferior = handle->inferior;
char bopcode = 0xcc;
guint32 address;
if (breakpoint->enabled)
return COMMAND_ERROR_NONE;
address = (guint32) breakpoint->address;
if (breakpoint->dr_index >= 0) {
X86_DR_SET_RW_LEN (arch, breakpoint->dr_index, DR_RW_EXECUTE | DR_LEN_1);
X86_DR_LOCAL_ENABLE (arch, breakpoint->dr_index);
result = _server_ptrace_set_dr (inferior, breakpoint->dr_index, address);
if (result != COMMAND_ERROR_NONE) {
g_warning (G_STRLOC);
return result;
}
result = _server_ptrace_set_dr (inferior, DR_CONTROL, arch->dr_control);
if (result != COMMAND_ERROR_NONE) {
g_warning (G_STRLOC);
return result;
}
arch->dr_regs [breakpoint->dr_index] = breakpoint->id;
} else {
result = server_ptrace_read_memory (handle, address, 1, &breakpoint->saved_insn);
if (result != COMMAND_ERROR_NONE)
return result;
if (handle->mono_runtime) {
result = runtime_info_enable_breakpoint (handle, breakpoint);
if (result != COMMAND_ERROR_NONE)
return result;
}
result = server_ptrace_write_memory (handle, address, 1, &bopcode);
if (result != COMMAND_ERROR_NONE)
return result;
}
return COMMAND_ERROR_NONE;
}
static ServerCommandError
x86_arch_disable_breakpoint (ServerHandle *handle, BreakpointInfo *breakpoint)
{
ServerCommandError result;
ArchInfo *arch = handle->arch;
InferiorHandle *inferior = handle->inferior;
guint32 address;
if (!breakpoint->enabled)
return COMMAND_ERROR_NONE;
address = (guint32) breakpoint->address;
if (breakpoint->dr_index >= 0) {
X86_DR_DISABLE (arch, breakpoint->dr_index);
result = _server_ptrace_set_dr (inferior, breakpoint->dr_index, 0L);
if (result != COMMAND_ERROR_NONE) {
g_warning (G_STRLOC ": %d", result);
return result;
}
result = _server_ptrace_set_dr (inferior, DR_CONTROL, arch->dr_control);
if (result != COMMAND_ERROR_NONE) {
g_warning (G_STRLOC ": %d", result);
return result;
}
arch->dr_regs [breakpoint->dr_index] = 0;
} else {
result = server_ptrace_write_memory (handle, address, 1, &breakpoint->saved_insn);
if (result != COMMAND_ERROR_NONE)
return result;
if (handle->mono_runtime) {
result = runtime_info_disable_breakpoint (handle, breakpoint);
if (result != COMMAND_ERROR_NONE)
return result;
}
}
return COMMAND_ERROR_NONE;
}
static ServerCommandError
server_ptrace_insert_breakpoint (ServerHandle *handle, guint64 address, guint32 *bhandle)
{
BreakpointInfo *breakpoint;
ServerCommandError result;
mono_debugger_breakpoint_manager_lock ();
breakpoint = (BreakpointInfo *) mono_debugger_breakpoint_manager_lookup (handle->bpm, address);
if (breakpoint) {
/*
* You cannot have a hardware breakpoint and a normal breakpoint on the same
* instruction.
*/
if (breakpoint->is_hardware_bpt) {
mono_debugger_breakpoint_manager_unlock ();
return COMMAND_ERROR_DR_OCCUPIED;
}
breakpoint->refcount++;
goto done;
}
breakpoint = g_new0 (BreakpointInfo, 1);
breakpoint->refcount = 1;
breakpoint->address = address;
breakpoint->is_hardware_bpt = FALSE;
breakpoint->id = mono_debugger_breakpoint_manager_get_next_id ();
breakpoint->dr_index = -1;
result = x86_arch_enable_breakpoint (handle, breakpoint);
if (result != COMMAND_ERROR_NONE) {
mono_debugger_breakpoint_manager_unlock ();
g_free (breakpoint);
return result;
}
breakpoint->enabled = TRUE;
mono_debugger_breakpoint_manager_insert (handle->bpm, (BreakpointInfo *) breakpoint);
done:
*bhandle = breakpoint->id;
mono_debugger_breakpoint_manager_unlock ();
return COMMAND_ERROR_NONE;
}
static ServerCommandError
server_ptrace_remove_breakpoint (ServerHandle *handle, guint32 bhandle)
{
BreakpointInfo *breakpoint;
ServerCommandError result;
mono_debugger_breakpoint_manager_lock ();
breakpoint = (BreakpointInfo *) mono_debugger_breakpoint_manager_lookup_by_id (handle->bpm, bhandle);
if (!breakpoint) {
result = COMMAND_ERROR_NO_SUCH_BREAKPOINT;
goto out;
}