6 instruction_operand::instruction_operand(relocation_entry rel_, code_block *compiled_, cell index_) :
7 rel(rel_), compiled(compiled_), index(index_), pointer((cell)compiled_->entry_point() + rel_.rel_offset()) {}
9 /* Load a 32-bit value from a PowerPC LIS/ORI sequence */
10 fixnum instruction_operand::load_value_2_2()
12 cell *ptr = (cell *)pointer;
13 cell hi = (ptr[-2] & 0xffff);
14 cell lo = (ptr[-1] & 0xffff);
18 /* Load a value from a bitfield of a PowerPC instruction */
19 fixnum instruction_operand::load_value_masked(cell mask, cell bits, cell shift)
21 s32 *ptr = (s32 *)(pointer - sizeof(u32));
23 return (((*ptr & (s32)mask) << bits) >> bits) << shift;
26 fixnum instruction_operand::load_value(cell relative_to)
28 switch(rel.rel_class())
30 case RC_ABSOLUTE_CELL:
31 return *(cell *)(pointer - sizeof(cell));
33 return *(u32 *)(pointer - sizeof(u32));
35 return *(s32 *)(pointer - sizeof(u32)) + relative_to;
36 case RC_ABSOLUTE_PPC_2_2:
37 return load_value_2_2();
38 case RC_ABSOLUTE_PPC_2:
39 return load_value_masked(rel_absolute_ppc_2_mask,16,0);
40 case RC_RELATIVE_PPC_2:
41 return load_value_masked(rel_relative_ppc_2_mask,16,0) + relative_to - sizeof(cell);
42 case RC_RELATIVE_PPC_3:
43 return load_value_masked(rel_relative_ppc_3_mask,6,0) + relative_to - sizeof(cell);
44 case RC_RELATIVE_ARM_3:
45 return load_value_masked(rel_relative_arm_3_mask,6,2) + relative_to + sizeof(cell);
47 return load_value_masked(rel_indirect_arm_mask,20,0) + relative_to;
48 case RC_INDIRECT_ARM_PC:
49 return load_value_masked(rel_indirect_arm_mask,20,0) + relative_to + sizeof(cell);
51 return *(u16 *)(pointer - sizeof(u16));
53 return *(u8 *)(pointer - sizeof(u8));
55 critical_error("Bad rel class",rel.rel_class());
60 fixnum instruction_operand::load_value()
62 return load_value(pointer);
65 code_block *instruction_operand::load_code_block(cell relative_to)
67 return ((code_block *)load_value(relative_to) - 1);
70 code_block *instruction_operand::load_code_block()
72 return load_code_block(pointer);
75 /* Store a 32-bit value into a PowerPC LIS/ORI sequence */
76 void instruction_operand::store_value_2_2(fixnum value)
78 cell *ptr = (cell *)pointer;
79 ptr[-2] = ((ptr[-2] & ~0xffff) | ((value >> 16) & 0xffff));
80 ptr[-1] = ((ptr[-1] & ~0xffff) | (value & 0xffff));
83 /* Store a value into a bitfield of a PowerPC instruction */
84 void instruction_operand::store_value_masked(fixnum value, cell mask, cell shift)
86 u32 *ptr = (u32 *)(pointer - sizeof(u32));
87 *ptr = (u32)((*ptr & ~mask) | ((value >> shift) & mask));
90 void instruction_operand::store_value(fixnum absolute_value)
92 fixnum relative_value = absolute_value - pointer;
94 switch(rel.rel_class())
96 case RC_ABSOLUTE_CELL:
97 *(cell *)(pointer - sizeof(cell)) = absolute_value;
100 *(u32 *)(pointer - sizeof(u32)) = (u32)absolute_value;
103 *(s32 *)(pointer - sizeof(s32)) = (s32)relative_value;
105 case RC_ABSOLUTE_PPC_2_2:
106 store_value_2_2(absolute_value);
108 case RC_ABSOLUTE_PPC_2:
109 store_value_masked(absolute_value,rel_absolute_ppc_2_mask,0);
111 case RC_RELATIVE_PPC_2:
112 store_value_masked(relative_value + sizeof(cell),rel_relative_ppc_2_mask,0);
114 case RC_RELATIVE_PPC_3:
115 store_value_masked(relative_value + sizeof(cell),rel_relative_ppc_3_mask,0);
117 case RC_RELATIVE_ARM_3:
118 store_value_masked(relative_value - sizeof(cell),rel_relative_arm_3_mask,2);
120 case RC_INDIRECT_ARM:
121 store_value_masked(relative_value,rel_indirect_arm_mask,0);
123 case RC_INDIRECT_ARM_PC:
124 store_value_masked(relative_value - sizeof(cell),rel_indirect_arm_mask,0);
127 *(u16 *)(pointer - sizeof(u16)) = (u16)absolute_value;
130 *(u8 *)(pointer - sizeof(u8)) = (u8)absolute_value;
133 critical_error("Bad rel class",rel.rel_class());
138 void instruction_operand::store_code_block(code_block *compiled)
140 store_value((cell)compiled->entry_point());