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root/cebix/SheepShaver/src/thunks.cpp
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Comparing SheepShaver/src/thunks.cpp (file contents):
Revision 1.5 by gbeauche, 2004-01-18T22:10:09Z vs.
Revision 1.6 by gbeauche, 2004-01-24T11:28:04Z

# Line 22 | Line 22
22   #include "thunks.h"
23   #include "emul_op.h"
24   #include "cpu_emulation.h"
25 + #include "xlowmem.h"
26  
27   // Native function declarations
28   #include "main.h"
# Line 31 | Line 32
32   #include "ether.h"
33   #include "macos_util.h"
34  
35 + // Generate PowerPC thunks for GetResource() replacements?
36 + #define POWERPC_GET_RESOURCE_THUNKS 1
37 +
38  
39   /*              NativeOp instruction format:
40                  +------------+--------------------------+--+----------+------------+
# Line 53 | Line 57 | uint32 NativeOpcode(int selector)
57          switch (selector) {
58          case NATIVE_DISABLE_INTERRUPT:
59          case NATIVE_ENABLE_INTERRUPT:
60 +        case NATIVE_CHECK_LOAD_INVOC:
61                  opcode = POWERPC_NATIVE_OP(0, selector);
62                  break;
63          case NATIVE_PATCH_NAME_REGISTRY:
# Line 90 | Line 95 | uint32 NativeOpcode(int selector)
95  
96  
97   /*
98 + *  Generate PowerPC thunks for GetResource() replacements
99 + */
100 +
101 + #if EMULATED_PPC
102 + static uint32 get_resource_func;
103 + static uint32 get_1_resource_func;
104 + static uint32 get_ind_resource_func;
105 + static uint32 get_1_ind_resource_func;
106 + static uint32 r_get_resource_func;
107 +
108 + static void generate_powerpc_thunks(void)
109 + {
110 +        static uint32 get_resource_template[] = {
111 +                PL(0x7c0802a6),         // mflr    r0
112 +                PL(0x90010008),         // stw     r0,8(r1)
113 +                PL(0x9421ffbc),         // stwu    r1,-68(r1)
114 +                PL(0x90610038),         // stw     r3,56(r1)
115 +                PL(0x9081003c),         // stw     r4,60(r1)
116 +                PL(0x00000000),         // lwz     r0,XLM_GET_RESOURCE(r0)
117 +                PL(0x80402834),         // lwz     r2,XLM_RES_LIB_TOC(r0)
118 +                PL(0x7c0903a6),         // mtctr   r0
119 +                PL(0x4e800421),         // bctrl
120 +                PL(0x90610040),         // stw     r3,64(r1)
121 +                PL(0x80610038),         // lwz     r3,56(r1)
122 +                PL(0xa881003e),         // lha     r4,62(r1)
123 +                PL(0x80a10040),         // lwz     r5,64(r1)
124 +                PL(0x00000001),         // <check_load_invoc>
125 +                PL(0x80610040),         // lwz     r3,64(r1)
126 +                PL(0x8001004c),         // lwz     r0,76(r1)
127 +                PL(0x7c0803a6),         // mtlr    r0
128 +                PL(0x38210044),         // addi    r1,r1,68
129 +                PL(0x4e800020)          // blr
130 +        };
131 +        const uint32 get_resource_template_size = sizeof(get_resource_template);
132 +
133 +        int xlm_index = -1, check_load_invoc_index = -1;
134 +        for (int i = 0; i < get_resource_template_size/4; i++) {
135 +                uint32 opcode = ntohl(get_resource_template[i]);
136 +                switch (opcode) {
137 +                case 0x00000000:
138 +                        xlm_index = i;
139 +                        break;
140 +                case 0x00000001:
141 +                        check_load_invoc_index = i;
142 +                        break;
143 +                }
144 +        }
145 +        assert(xlm_index != -1 && check_load_invoc_index != -1);
146 +
147 +        uint32 check_load_invoc_opcode = NativeOpcode(NATIVE_CHECK_LOAD_INVOC);
148 +        uintptr base;
149 +
150 +        // GetResource()
151 +        get_resource_func = base = SheepMem::Reserve(get_resource_template_size);
152 +        Host2Mac_memcpy(base, get_resource_template, get_resource_template_size);
153 +        WriteMacInt32(base + xlm_index * 4, 0x80000000 | XLM_GET_RESOURCE);
154 +        WriteMacInt32(base + check_load_invoc_index * 4, check_load_invoc_opcode);
155 +
156 +        // Get1Resource()
157 +        get_1_resource_func = base = SheepMem::Reserve(get_resource_template_size);
158 +        Host2Mac_memcpy(base, get_resource_template, get_resource_template_size);
159 +        WriteMacInt32(base + xlm_index * 4, 0x80000000 | XLM_GET_1_RESOURCE);
160 +        WriteMacInt32(base + check_load_invoc_index * 4, check_load_invoc_opcode);
161 +
162 +        // GetIndResource()
163 +        get_ind_resource_func = base = SheepMem::Reserve(get_resource_template_size);
164 +        Host2Mac_memcpy(base, get_resource_template, get_resource_template_size);
165 +        WriteMacInt32(base + xlm_index * 4, 0x80000000 | XLM_GET_IND_RESOURCE);
166 +        WriteMacInt32(base + check_load_invoc_index * 4, check_load_invoc_opcode);
167 +
168 +        // Get1IndResource()
169 +        get_1_ind_resource_func = base = SheepMem::Reserve(get_resource_template_size);
170 +        Host2Mac_memcpy(base, get_resource_template, get_resource_template_size);
171 +        WriteMacInt32(base + xlm_index * 4, 0x80000000 | XLM_GET_1_IND_RESOURCE);
172 +        WriteMacInt32(base + check_load_invoc_index * 4, check_load_invoc_opcode);
173 +
174 +        // RGetResource()
175 +        r_get_resource_func = base = SheepMem::Reserve(get_resource_template_size);
176 +        Host2Mac_memcpy(base, get_resource_template, get_resource_template_size);
177 +        WriteMacInt32(base + xlm_index * 4, 0x80000000 | XLM_R_GET_RESOURCE);
178 +        WriteMacInt32(base + check_load_invoc_index * 4, check_load_invoc_opcode);
179 + }
180 + #endif
181 +
182 +
183 + /*
184   *  Initialize the thunks system
185   */
186  
# Line 111 | Line 202 | bool ThunksInit(void)
202                  native_op[i].tvect = base;
203                  native_op[i].func  = base + 8;
204          }
205 + #if POWERPC_GET_RESOURCE_THUNKS
206 +        generate_powerpc_thunks();
207 +        native_op[NATIVE_GET_RESOURCE].func = get_resource_func;
208 +        native_op[NATIVE_GET_1_RESOURCE].func = get_1_resource_func;
209 +        native_op[NATIVE_GET_IND_RESOURCE].func = get_ind_resource_func;
210 +        native_op[NATIVE_GET_1_IND_RESOURCE].func = get_1_ind_resource_func;
211 +        native_op[NATIVE_R_GET_RESOURCE].func = r_get_resource_func;
212 + #endif
213   #else
214   #if defined(__linux__) || (defined(__APPLE__) && defined(__MACH__))
215   #define DEFINE_NATIVE_OP(ID, FUNC) do {                         \

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