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45 lines
1.3 KiB
Odin
45 lines
1.3 KiB
Odin
package rexcode_arm64
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// =============================================================================
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// AArch64 RELOCATIONS
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// =============================================================================
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//
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// Per the cross-arch design (§2.4): each arch owns its own enum + struct.
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// AArch64 has several PC-relative immediate widths plus the unusual
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// ADR/ADRP pair where ADRP carries the page-aligned high bits and ADD
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// (or LDR/STR) carries the low 12. PAC, GOT, and TLS relocations are
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// follow-up work.
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Relocation_Type :: enum u8 {
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NONE = 0,
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// PC-relative branches
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B26, // 26-bit signed offset (×4) -- B / BL
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B_COND19, // 19-bit signed offset (×4) -- B.cond, CBZ/CBNZ
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TBZ14, // 14-bit signed offset (×4) -- TBZ / TBNZ
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// PC-relative addressing
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ADR_PCREL21, // ±1MB signed offset -- ADR
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ADRP_PCREL21, // ±4GB signed offset on 4K page boundary -- ADRP
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PCREL_LO12_I, // low 12 of (sym - page_of(ADRP)) -- ADD/LDR/STR after ADRP
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PCREL_LO12_S, // S-form variant if needed for store-pair-style ops
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// Load-literal (PC-relative 19-bit signed, scaled by 4)
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LDR_LITERAL19,
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// Absolute (filled by linker)
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ABS64,
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ABS32,
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ABS16,
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}
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Relocation :: struct #packed {
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offset: u32,
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label_id: u32,
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addend: i32,
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type: Relocation_Type,
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size: u8,
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inst_idx: u16,
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}
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#assert(size_of(Relocation) == 16)
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