1 /** @file
2
3 Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
4 This program and the accompanying materials
5 are licensed and made available under the terms and conditions of the BSD License
6 which accompanies this distribution. The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.php
8
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11
12
13 **/
14
15 #include "Edb.h"
16
17 /**
18
19 Check whether current IP is EBC CALL instruction (NOTE: CALLEX is exclusive)
20
21 @param Address - EBC IP address.
22
23 @retval TRUE - Current IP is EBC CALL instruction
24 @retval FALSE - Current IP is not EBC CALL instruction
25
26 **/
27 BOOLEAN
IsEBCCALL(IN UINTN Address)28 IsEBCCALL (
29 IN UINTN Address
30 )
31 {
32 if (GET_OPCODE(Address) != OPCODE_CALL) {
33 return FALSE;
34 }
35
36 if (GET_OPERANDS (Address) & OPERAND_M_NATIVE_CALL) {
37 return FALSE;
38 } else {
39 return TRUE;
40 }
41 }
42
43 /**
44
45 Check whether current IP is EBC RET instruction.
46
47 @param Address - EBC IP address.
48
49 @retval TRUE - Current IP is EBC RET instruction
50 @retval FALSE - Current IP is not EBC RET instruction
51
52 **/
53 BOOLEAN
IsEBCRET(IN UINTN Address)54 IsEBCRET (
55 IN UINTN Address
56 )
57 {
58 if (GET_OPCODE(Address) != OPCODE_RET) {
59 return FALSE;
60 }
61
62 if (GET_OPERANDS (Address) != 0) {
63 return FALSE;
64 } else {
65 return TRUE;
66 }
67 }
68
69 /**
70
71 DebuggerCommand - StepInto.
72
73 @param CommandArg - The argument for this command
74 @param DebuggerPrivate - EBC Debugger private data structure
75 @param ExceptionType - Exception type.
76 @param SystemContext - EBC system context.
77
78 @retval EFI_DEBUG_CONTINUE - formal return value
79
80 **/
81 EFI_DEBUG_STATUS
DebuggerStepInto(IN CHAR16 * CommandArg,IN EFI_DEBUGGER_PRIVATE_DATA * DebuggerPrivate,IN EFI_EXCEPTION_TYPE ExceptionType,IN OUT EFI_SYSTEM_CONTEXT SystemContext)82 DebuggerStepInto (
83 IN CHAR16 *CommandArg,
84 IN EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
85 IN EFI_EXCEPTION_TYPE ExceptionType,
86 IN OUT EFI_SYSTEM_CONTEXT SystemContext
87 )
88 {
89 SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
90
91 return EFI_DEBUG_BREAK;
92 }
93
94 /**
95
96 DebuggerCommand - StepOver.
97
98 @param CommandArg - The argument for this command
99 @param DebuggerPrivate - EBC Debugger private data structure
100 @param ExceptionType - Exception type.
101 @param SystemContext - EBC system context.
102
103 @retval EFI_DEBUG_CONTINUE - formal return value
104
105 **/
106 EFI_DEBUG_STATUS
DebuggerStepOver(IN CHAR16 * CommandArg,IN EFI_DEBUGGER_PRIVATE_DATA * DebuggerPrivate,IN EFI_EXCEPTION_TYPE ExceptionType,IN OUT EFI_SYSTEM_CONTEXT SystemContext)107 DebuggerStepOver (
108 IN CHAR16 *CommandArg,
109 IN EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
110 IN EFI_EXCEPTION_TYPE ExceptionType,
111 IN OUT EFI_SYSTEM_CONTEXT SystemContext
112 )
113 {
114 if (IsEBCCALL((UINTN)SystemContext.SystemContextEbc->Ip)) {
115 //
116 // Check CALL (NOTE: CALLEX is exclusive)
117 //
118 DebuggerPrivate->FeatureFlags |= EFI_DEBUG_FLAG_EBC_STEPOVER;
119 } else {
120 //
121 // Other instruction including CALLEX
122 //
123 SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
124 }
125
126 return EFI_DEBUG_BREAK;
127 }
128
129 /**
130
131 DebuggerCommand - StepOut.
132
133 @param CommandArg - The argument for this command
134 @param DebuggerPrivate - EBC Debugger private data structure
135 @param ExceptionType - Exception type.
136 @param SystemContext - EBC system context.
137
138 @retval EFI_DEBUG_CONTINUE - formal return value
139
140 **/
141 EFI_DEBUG_STATUS
DebuggerStepOut(IN CHAR16 * CommandArg,IN EFI_DEBUGGER_PRIVATE_DATA * DebuggerPrivate,IN EFI_EXCEPTION_TYPE ExceptionType,IN OUT EFI_SYSTEM_CONTEXT SystemContext)142 DebuggerStepOut (
143 IN CHAR16 *CommandArg,
144 IN EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
145 IN EFI_EXCEPTION_TYPE ExceptionType,
146 IN OUT EFI_SYSTEM_CONTEXT SystemContext
147 )
148 {
149 if (IsEBCRET((UINTN)SystemContext.SystemContextEbc->Ip)) {
150 //
151 // Check RET
152 //
153 SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
154 } else {
155 //
156 // Other instruction
157 //
158 DebuggerPrivate->FeatureFlags |= EFI_DEBUG_FLAG_EBC_STEPOUT;
159 }
160
161 return EFI_DEBUG_BREAK;
162 }
163