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95df04fbe1
Move all ten ISA packages (x86, arm32, arm64, mips, riscv, ppc, ppc_vle, rsp, mos6502, mos65816) from core/rexcode/<arch> to core/rexcode/isa/<arch>, so the import pattern is now `import "core:rexcode/isa/x86"`. The shared core stays at core:rexcode/isa. Mechanical: relative `import "../isa"` / "../../isa" -> absolute "core:rexcode/isa" (the only path that survives the move; the "../" and "../.." self/generated imports move with their packages). build.lua now builds paths as <root>/isa/<name>; stale `cd <arch>` hints in the verify tools and the doc.odin paths updated. WASM stays at core/rexcode/wasm for now -- it is an IR, not an ISA, and will move under the forthcoming core:rexcode/ir once that layer lands. All 10 arches gen/builders/check/test green; import core:rexcode/isa/x86 verified working; wasm still compiles.
47 lines
1.4 KiB
Odin
47 lines
1.4 KiB
Odin
// rexcode · Brendan Punsky (dotbmp@github), original author
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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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