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parser for .eh_frame versions of CIE and FDE and new helper for

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mapping PC -> CFI Row
This commit is contained in:
Nikita Smith
2025-11-07 14:39:45 -08:00
committed by Ryan Fleury
parent ecbce1efdf
commit da38f266d9
11 changed files with 487 additions and 166 deletions
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src/eh/eh_frame.h
+44 -3
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@@ -4,6 +4,9 @@
#ifndef EH_FRAME_H
#define EH_FRAME_H
////////////////////////////////
//~ Format
typedef U8 EH_PtrEnc;
enum
{
@@ -65,10 +68,48 @@ typedef struct EH_Augmentation
} EH_Augmentation;
////////////////////////////////
//~ Parser
internal U64 eh_read_ptr(String8 frame_base, U64 off, EH_PtrCtx *ptr_ctx, EH_PtrEnc encoding, U64 *ptr_out);
internal U64 eh_parse_aug_data(String8 aug_string, String8 aug_data, EH_PtrCtx *ptr_ctx, EH_Augmentation *aug_out);
internal U64 eh_size_from_aug_data(String8 aug_string, String8 data, EH_PtrCtx *ptr_ctx);
enum
{
EH_CIE_Ext_AddrEnc,
EH_CIE_Ext_LSDAEnc,
EH_CIE_Ext_HandlerEnc,
EH_CIE_Ext_HandlerIp,
} EH_CIE_Ext;
typedef struct EH_FrameHdrEntry
{
U64 addr;
U64 fde_offset;
} EH_FrameHdrEntry;
typedef struct EH_FrameHdr
{
U8 version;
EH_PtrEnc eh_frame_ptr_enc;
EH_PtrEnc fde_count_enc;
EH_PtrEnc table_enc;
U64 field_byte_size;
U64 entry_byte_size;
U64 fde_count;
String8 table;
} EH_FrameHdr;
typedef struct EH_DecodePtrCtx
{
EH_PtrEnc addr_enc;
EH_PtrCtx *ptr_ctx;
} EH_DecodePtrCtx;
////////////////////////////////
internal U64 eh_parse_ptr(String8 frame_base, U64 off, EH_PtrCtx *ptr_ctx, EH_PtrEnc encoding, U64 *ptr_out);
internal EH_FrameHdr eh_parse_frame_hdr(String8 data, U64 address_size, EH_PtrCtx *ptr_ctx);
internal U64 eh_parse_aug_data(String8 aug_string, String8 aug_data, EH_PtrCtx *ptr_ctx, EH_Augmentation *aug_out);
internal B32 eh_parse_cfi(String8 eh_frame, U64 fde_offset, Arch arch, EH_PtrCtx *ptr_ctx, struct DW_CIE *cie_out, struct DW_FDE *fde_out);
internal U64 eh_find_nearest_fde(EH_FrameHdr header, EH_PtrCtx *ptr_ctx, U64 pc);
internal String8 eh_frame_hdr_from_call_frame_info(Arena *arena, U64 fde_count, U64 *fde_offsets, struct DW_FDE *fde);
////////////////////////////////
//~ Enum -> String