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sketch out extra disasm instruction outputs for determining read/write locations from instructions (autos)

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Ryan Fleury
2026-05-11 14:53:05 -07:00
parent d1536953b0
commit cbbacf0b5f
2 changed files with 26 additions and 10 deletions
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src/disasm/disasm.c
+21 -9
View File
@@ -39,11 +39,22 @@ dasm_inst_from_code(Arena *arena, Arch arch, U64 vaddr, String8 code, DASM_Synta
// rjf: analyze
DASM_InstFlags flags = 0;
U64 jump_dest_vaddr = 0;
U64 dst_vaddr = 0;
{
ZydisDecodedOperand *first_visible_op = (zinst.info.operand_count_visible > 0 ? &zinst.operands[0] : 0);
ZydisDecodedOperand *first_op = (zinst.info.operand_count > 0 ? &zinst.operands[0] : 0);
ZydisDecodedOperand *second_op = (zinst.info.operand_count > 1 ? &zinst.operands[1] : 0);
if(first_op != 0 &&
first_op->actions & ZYDIS_OPERAND_ACTION_WRITE)
{
// TODO(rjf): need to pass back register + offset
}
if(second_op != 0 &&
second_op->actions & ZYDIS_OPERAND_ACTION_READ)
{
// TODO(rjf): need to pass back register + offset
}
if(first_visible_op != 0 &&
(first_visible_op->encoding == ZYDIS_OPERAND_ENCODING_JIMM8 ||
first_visible_op->encoding == ZYDIS_OPERAND_ENCODING_JIMM16 ||
@@ -53,7 +64,7 @@ dasm_inst_from_code(Arena *arena, Arch arch, U64 vaddr, String8 code, DASM_Synta
first_visible_op->encoding == ZYDIS_OPERAND_ENCODING_JIMM32_32_64 ||
first_visible_op->encoding == ZYDIS_OPERAND_ENCODING_JIMM16_32_32))
{
ZydisCalcAbsoluteAddress(&zinst.info, first_visible_op, vaddr, &jump_dest_vaddr);
ZydisCalcAbsoluteAddress(&zinst.info, first_visible_op, vaddr, &dst_vaddr);
}
if(first_op != 0 && second_op != 0 && first_op->type == ZYDIS_OPERAND_TYPE_REGISTER &&
(first_op->reg.value == ZYDIS_REGISTER_RSP ||
@@ -136,8 +147,9 @@ dasm_inst_from_code(Arena *arena, Arch arch, U64 vaddr, String8 code, DASM_Synta
{
inst.flags = flags;
inst.size = zinst.info.length;
inst.string = push_str8_copy(arena, str8_cstring(zinst.text));
inst.jump_dest_vaddr = jump_dest_vaddr;
inst.string = str8_copy(arena, str8_cstring(zinst.text));
inst.dst_vaddr = dst_vaddr;
inst.src_vaddr = src_vaddr;
}
}break;
}
@@ -163,7 +175,7 @@ dasm_ctrl_flow_info_from_arch_vaddr_code(Arena *arena, DASM_InstFlags exit_point
DASM_CtrlFlowPoint point = {0};
point.inst_flags = inst.flags;
point.vaddr = inst_vaddr;
point.jump_dest_vaddr = inst.jump_dest_vaddr;
point.jump_dest_vaddr = inst.dst_vaddr;
DASM_CtrlFlowPointNode *node = push_array(arena, DASM_CtrlFlowPointNode, 1);
node->v = point;
SLLQueuePush(info.exit_points.first, info.exit_points.last, node);
@@ -405,9 +417,9 @@ dasm_artifact_create(String8 key, B32 *cancel_signal, B32 *retry_out, U64 *gen_o
code_bytes_part = str8_list_join(scratch.arena, &code_bytes_strings, 0);
}
String8 symbol_part = {0};
if(inst.jump_dest_vaddr != 0 && rdi != &rdi_parsed_nil && params.style_flags & DASM_StyleFlag_SymbolNames)
if(inst.dst_vaddr != 0 && rdi != &rdi_parsed_nil && params.style_flags & DASM_StyleFlag_SymbolNames)
{
RDI_U32 scope_idx = rdi_vmap_idx_from_section_kind_voff(rdi, RDI_SectionKind_ScopeVMap, inst.jump_dest_vaddr-params.base_vaddr);
RDI_U32 scope_idx = rdi_vmap_idx_from_section_kind_voff(rdi, RDI_SectionKind_ScopeVMap, inst.dst_vaddr-params.base_vaddr);
if(scope_idx != 0)
{
RDI_Scope *scope = rdi_element_from_name_idx(rdi, Scopes, scope_idx);
@@ -422,8 +434,8 @@ dasm_artifact_create(String8 key, B32 *cancel_signal, B32 *retry_out, U64 *gen_o
}
}
String8 inst_string = push_str8f(scratch.arena, "%S%S%S%S", addr_part, code_bytes_part, inst.string, symbol_part);
DASM_Line line = {u32_from_u64_saturate(off), 0, inst.jump_dest_vaddr, r1u64(inst_strings.total_size + inst_strings.node_count,
inst_strings.total_size + inst_strings.node_count + inst_string.size)};
DASM_Line line = {u32_from_u64_saturate(off), 0, inst.dst_vaddr, r1u64(inst_strings.total_size + inst_strings.node_count,
inst_strings.total_size + inst_strings.node_count + inst_string.size)};
dasm_line_chunk_list_push(scratch.arena, &line_list, 1024, &line);
str8_list_push(scratch.arena, &inst_strings, inst_string);
src/disasm/disasm.h
+5 -1
View File
@@ -37,7 +37,11 @@ struct DASM_Inst
DASM_InstFlags flags;
U32 size;
String8 string;
U64 jump_dest_vaddr;
U64 dst_vaddr;
ARCH_RegCode dst_base_reg;
U64 dst_off;
ARCH_RegCode src_base_reg;
U64 src_off;
};
////////////////////////////////