144 lines
4.1 KiB
C++
144 lines
4.1 KiB
C++
#include "master.hpp"
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namespace factor
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{
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instruction_operand::instruction_operand(relocation_entry rel_, code_block *compiled_, cell index_) :
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rel(rel_), compiled(compiled_), index(index_), pointer((cell)compiled_->entry_point() + rel_.rel_offset()) {}
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/* Load a 32-bit value from a PowerPC LIS/ORI sequence */
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fixnum instruction_operand::load_value_2_2()
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{
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cell *ptr = (cell *)pointer;
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cell hi = (ptr[-2] & 0xffff);
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cell lo = (ptr[-1] & 0xffff);
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return hi << 16 | lo;
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}
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/* Load a value from a bitfield of a PowerPC instruction */
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fixnum instruction_operand::load_value_masked(cell mask, cell bits, cell shift)
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{
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s32 *ptr = (s32 *)(pointer - sizeof(u32));
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return (((*ptr & (s32)mask) << bits) >> bits) << shift;
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}
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fixnum instruction_operand::load_value(cell relative_to)
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{
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switch(rel.rel_class())
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{
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case RC_ABSOLUTE_CELL:
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return *(cell *)(pointer - sizeof(cell));
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case RC_ABSOLUTE:
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return *(u32 *)(pointer - sizeof(u32));
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case RC_RELATIVE:
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return *(s32 *)(pointer - sizeof(u32)) + relative_to;
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case RC_ABSOLUTE_PPC_2_2:
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return load_value_2_2();
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case RC_ABSOLUTE_PPC_2:
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return load_value_masked(rel_absolute_ppc_2_mask,16,0);
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case RC_RELATIVE_PPC_2:
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return load_value_masked(rel_relative_ppc_2_mask,16,0) + relative_to - sizeof(cell);
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case RC_RELATIVE_PPC_3:
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return load_value_masked(rel_relative_ppc_3_mask,6,0) + relative_to - sizeof(cell);
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case RC_RELATIVE_ARM_3:
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return load_value_masked(rel_relative_arm_3_mask,6,2) + relative_to + sizeof(cell);
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case RC_INDIRECT_ARM:
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return load_value_masked(rel_indirect_arm_mask,20,0) + relative_to;
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case RC_INDIRECT_ARM_PC:
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return load_value_masked(rel_indirect_arm_mask,20,0) + relative_to + sizeof(cell);
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case RC_ABSOLUTE_2:
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return *(u16 *)(pointer - sizeof(u16));
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case RC_ABSOLUTE_1:
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return *(u8 *)(pointer - sizeof(u8));
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default:
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critical_error("Bad rel class",rel.rel_class());
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return 0;
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}
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}
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fixnum instruction_operand::load_value()
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{
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return load_value(pointer);
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}
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code_block *instruction_operand::load_code_block(cell relative_to)
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{
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return ((code_block *)load_value(relative_to) - 1);
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}
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code_block *instruction_operand::load_code_block()
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{
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return load_code_block(pointer);
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}
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/* Store a 32-bit value into a PowerPC LIS/ORI sequence */
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void instruction_operand::store_value_2_2(fixnum value)
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{
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cell *ptr = (cell *)pointer;
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ptr[-2] = ((ptr[-2] & ~0xffff) | ((value >> 16) & 0xffff));
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ptr[-1] = ((ptr[-1] & ~0xffff) | (value & 0xffff));
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}
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/* Store a value into a bitfield of a PowerPC instruction */
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void instruction_operand::store_value_masked(fixnum value, cell mask, cell shift)
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{
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u32 *ptr = (u32 *)(pointer - sizeof(u32));
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*ptr = (u32)((*ptr & ~mask) | ((value >> shift) & mask));
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}
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void instruction_operand::store_value(fixnum absolute_value)
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{
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fixnum relative_value = absolute_value - pointer;
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switch(rel.rel_class())
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{
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case RC_ABSOLUTE_CELL:
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*(cell *)(pointer - sizeof(cell)) = absolute_value;
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break;
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case RC_ABSOLUTE:
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*(u32 *)(pointer - sizeof(u32)) = (u32)absolute_value;
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break;
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case RC_RELATIVE:
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*(s32 *)(pointer - sizeof(s32)) = (s32)relative_value;
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break;
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case RC_ABSOLUTE_PPC_2_2:
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store_value_2_2(absolute_value);
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break;
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case RC_ABSOLUTE_PPC_2:
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store_value_masked(absolute_value,rel_absolute_ppc_2_mask,0);
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break;
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case RC_RELATIVE_PPC_2:
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store_value_masked(relative_value + sizeof(cell),rel_relative_ppc_2_mask,0);
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break;
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case RC_RELATIVE_PPC_3:
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store_value_masked(relative_value + sizeof(cell),rel_relative_ppc_3_mask,0);
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break;
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case RC_RELATIVE_ARM_3:
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store_value_masked(relative_value - sizeof(cell),rel_relative_arm_3_mask,2);
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break;
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case RC_INDIRECT_ARM:
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store_value_masked(relative_value,rel_indirect_arm_mask,0);
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break;
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case RC_INDIRECT_ARM_PC:
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store_value_masked(relative_value - sizeof(cell),rel_indirect_arm_mask,0);
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break;
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case RC_ABSOLUTE_2:
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*(u16 *)(pointer - sizeof(u16)) = (u16)absolute_value;
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break;
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case RC_ABSOLUTE_1:
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*(u8 *)(pointer - sizeof(u8)) = (u8)absolute_value;
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break;
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default:
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critical_error("Bad rel class",rel.rel_class());
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break;
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}
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}
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void instruction_operand::store_code_block(code_block *compiled)
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{
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store_value((cell)compiled->entry_point());
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}
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}
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