elf: enable adding support for additional cpu archs

1 files changed, 264 insertions, 0 deletions

diff --git a/src/link/Elf/relocation.zig b/src/link/Elf/relocation.zig
new file mode 100644
index 0000000000..5441663948
--- /dev/null
+++ b/src/link/Elf/relocation.zig
@@ -0,0 +1,264 @@
+pub const Kind = enum {
+    abs,
+    copy,
+    rel,
+    irel,
+    glob_dat,
+    jump_slot,
+    dtpmod,
+    dtpoff,
+    tpoff,
+    tlsdesc,
+};
+
+const x86_64_relocs = [_]struct { Kind, u32 }{
+    .{ .abs, elf.R_X86_64_64 },
+    .{ .copy, elf.R_X86_64_COPY },
+    .{ .rel, elf.R_X86_64_RELATIVE },
+    .{ .irel, elf.R_X86_64_IRELATIVE },
+    .{ .glob_dat, elf.R_X86_64_GLOB_DAT },
+    .{ .jump_slot, elf.R_X86_64_JUMP_SLOT },
+    .{ .dtpmod, elf.R_X86_64_DTPMOD64 },
+    .{ .dtpoff, elf.R_X86_64_DTPOFF64 },
+    .{ .tpoff, elf.R_X86_64_TPOFF64 },
+    .{ .tlsdesc, elf.R_X86_64_TLSDESC },
+};
+
+const aarch64_relocs = [_]struct { Kind, u32 }{
+    .{ .abs, elf.R_AARCH64_ABS64 },
+    .{ .copy, elf.R_AARCH64_COPY },
+    .{ .rel, elf.R_AARCH64_RELATIVE },
+    .{ .irel, elf.R_AARCH64_IRELATIVE },
+    .{ .glob_dat, elf.R_AARCH64_GLOB_DAT },
+    .{ .jump_slot, elf.R_AARCH64_JUMP_SLOT },
+    .{ .dtpmod, elf.R_AARCH64_TLS_DTPMOD },
+    .{ .dtpoff, elf.R_AARCH64_TLS_DTPREL },
+    .{ .tpoff, elf.R_AARCH64_TLS_TPREL },
+    .{ .tlsdesc, elf.R_AARCH64_TLSDESC },
+};
+
+pub fn decode(r_type: u32, cpu_arch: std.Target.Cpu.Arch) ?Kind {
+    const relocs = switch (cpu_arch) {
+        .x86_64 => &x86_64_relocs,
+        .aarch64 => &aarch64_relocs,
+        else => @panic("TODO unhandled cpu arch"),
+    };
+    inline for (relocs) |entry| {
+        if (entry[1] == r_type) return entry[0];
+    }
+    return null;
+}
+
+pub fn encode(comptime kind: Kind, cpu_arch: std.Target.Cpu.Arch) u32 {
+    const relocs = switch (cpu_arch) {
+        .x86_64 => &x86_64_relocs,
+        .aarch64 => &aarch64_relocs,
+        else => @panic("TODO unhandled cpu arch"),
+    };
+    inline for (relocs) |entry| {
+        if (entry[0] == kind) return entry[1];
+    }
+    unreachable;
+}
+
+const FormatRelocTypeCtx = struct {
+    r_type: u32,
+    cpu_arch: std.Target.Cpu.Arch,
+};
+
+pub fn fmtRelocType(r_type: u32, cpu_arch: std.Target.Cpu.Arch) std.fmt.Formatter(formatRelocType) {
+    return .{ .data = .{
+        .r_type = r_type,
+        .cpu_arch = cpu_arch,
+    } };
+}
+
+fn formatRelocType(
+    ctx: FormatRelocTypeCtx,
+    comptime unused_fmt_string: []const u8,
+    options: std.fmt.FormatOptions,
+    writer: anytype,
+) !void {
+    _ = unused_fmt_string;
+    _ = options;
+    const r_type = ctx.r_type;
+    const str = switch (ctx.cpu_arch) {
+        .x86_64 => switch (r_type) {
+            elf.R_X86_64_NONE => "R_X86_64_NONE",
+            elf.R_X86_64_64 => "R_X86_64_64",
+            elf.R_X86_64_PC32 => "R_X86_64_PC32",
+            elf.R_X86_64_GOT32 => "R_X86_64_GOT32",
+            elf.R_X86_64_PLT32 => "R_X86_64_PLT32",
+            elf.R_X86_64_COPY => "R_X86_64_COPY",
+            elf.R_X86_64_GLOB_DAT => "R_X86_64_GLOB_DAT",
+            elf.R_X86_64_JUMP_SLOT => "R_X86_64_JUMP_SLOT",
+            elf.R_X86_64_RELATIVE => "R_X86_64_RELATIVE",
+            elf.R_X86_64_GOTPCREL => "R_X86_64_GOTPCREL",
+            elf.R_X86_64_32 => "R_X86_64_32",
+            elf.R_X86_64_32S => "R_X86_64_32S",
+            elf.R_X86_64_16 => "R_X86_64_16",
+            elf.R_X86_64_PC16 => "R_X86_64_PC16",
+            elf.R_X86_64_8 => "R_X86_64_8",
+            elf.R_X86_64_PC8 => "R_X86_64_PC8",
+            elf.R_X86_64_DTPMOD64 => "R_X86_64_DTPMOD64",
+            elf.R_X86_64_DTPOFF64 => "R_X86_64_DTPOFF64",
+            elf.R_X86_64_TPOFF64 => "R_X86_64_TPOFF64",
+            elf.R_X86_64_TLSGD => "R_X86_64_TLSGD",
+            elf.R_X86_64_TLSLD => "R_X86_64_TLSLD",
+            elf.R_X86_64_DTPOFF32 => "R_X86_64_DTPOFF32",
+            elf.R_X86_64_GOTTPOFF => "R_X86_64_GOTTPOFF",
+            elf.R_X86_64_TPOFF32 => "R_X86_64_TPOFF32",
+            elf.R_X86_64_PC64 => "R_X86_64_PC64",
+            elf.R_X86_64_GOTOFF64 => "R_X86_64_GOTOFF64",
+            elf.R_X86_64_GOTPC32 => "R_X86_64_GOTPC32",
+            elf.R_X86_64_GOT64 => "R_X86_64_GOT64",
+            elf.R_X86_64_GOTPCREL64 => "R_X86_64_GOTPCREL64",
+            elf.R_X86_64_GOTPC64 => "R_X86_64_GOTPC64",
+            elf.R_X86_64_GOTPLT64 => "R_X86_64_GOTPLT64",
+            elf.R_X86_64_PLTOFF64 => "R_X86_64_PLTOFF64",
+            elf.R_X86_64_SIZE32 => "R_X86_64_SIZE32",
+            elf.R_X86_64_SIZE64 => "R_X86_64_SIZE64",
+            elf.R_X86_64_GOTPC32_TLSDESC => "R_X86_64_GOTPC32_TLSDESC",
+            elf.R_X86_64_TLSDESC_CALL => "R_X86_64_TLSDESC_CALL",
+            elf.R_X86_64_TLSDESC => "R_X86_64_TLSDESC",
+            elf.R_X86_64_IRELATIVE => "R_X86_64_IRELATIVE",
+            elf.R_X86_64_RELATIVE64 => "R_X86_64_RELATIVE64",
+            elf.R_X86_64_GOTPCRELX => "R_X86_64_GOTPCRELX",
+            elf.R_X86_64_REX_GOTPCRELX => "R_X86_64_REX_GOTPCRELX",
+            elf.R_X86_64_NUM => "R_X86_64_NUM",
+            else => "R_X86_64_UNKNOWN",
+        },
+        .aarch64 => switch (r_type) {
+            elf.R_AARCH64_NONE => "R_AARCH64_NONE",
+            elf.R_AARCH64_ABS64 => "R_AARCH64_ABS64",
+            elf.R_AARCH64_ABS32 => "R_AARCH64_ABS32",
+            elf.R_AARCH64_ABS16 => "R_AARCH64_ABS16",
+            elf.R_AARCH64_PREL64 => "R_AARCH64_PREL64",
+            elf.R_AARCH64_PREL32 => "R_AARCH64_PREL32",
+            elf.R_AARCH64_PREL16 => "R_AARCH64_PREL16",
+            elf.R_AARCH64_MOVW_UABS_G0 => "R_AARCH64_MOVW_UABS_G0",
+            elf.R_AARCH64_MOVW_UABS_G0_NC => "R_AARCH64_MOVW_UABS_G0_NC",
+            elf.R_AARCH64_MOVW_UABS_G1 => "R_AARCH64_MOVW_UABS_G1",
+            elf.R_AARCH64_MOVW_UABS_G1_NC => "R_AARCH64_MOVW_UABS_G1_NC",
+            elf.R_AARCH64_MOVW_UABS_G2 => "R_AARCH64_MOVW_UABS_G2",
+            elf.R_AARCH64_MOVW_UABS_G2_NC => "R_AARCH64_MOVW_UABS_G2_NC",
+            elf.R_AARCH64_MOVW_UABS_G3 => "R_AARCH64_MOVW_UABS_G3",
+            elf.R_AARCH64_MOVW_SABS_G0 => "R_AARCH64_MOVW_SABS_G0",
+            elf.R_AARCH64_MOVW_SABS_G1 => "R_AARCH64_MOVW_SABS_G1",
+            elf.R_AARCH64_MOVW_SABS_G2 => "R_AARCH64_MOVW_SABS_G2",
+            elf.R_AARCH64_LD_PREL_LO19 => "R_AARCH64_LD_PREL_LO19",
+            elf.R_AARCH64_ADR_PREL_LO21 => "R_AARCH64_ADR_PREL_LO21",
+            elf.R_AARCH64_ADR_PREL_PG_HI21 => "R_AARCH64_ADR_PREL_PG_HI21",
+            elf.R_AARCH64_ADR_PREL_PG_HI21_NC => "R_AARCH64_ADR_PREL_PG_HI21_NC",
+            elf.R_AARCH64_ADD_ABS_LO12_NC => "R_AARCH64_ADD_ABS_LO12_NC",
+            elf.R_AARCH64_LDST8_ABS_LO12_NC => "R_AARCH64_LDST8_ABS_LO12_NC",
+            elf.R_AARCH64_TSTBR14 => "R_AARCH64_TSTBR14",
+            elf.R_AARCH64_CONDBR19 => "R_AARCH64_CONDBR19",
+            elf.R_AARCH64_JUMP26 => "R_AARCH64_JUMP26",
+            elf.R_AARCH64_CALL26 => "R_AARCH64_CALL26",
+            elf.R_AARCH64_LDST16_ABS_LO12_NC => "R_AARCH64_LDST16_ABS_LO12_NC",
+            elf.R_AARCH64_LDST32_ABS_LO12_NC => "R_AARCH64_LDST32_ABS_LO12_NC",
+            elf.R_AARCH64_LDST64_ABS_LO12_NC => "R_AARCH64_LDST64_ABS_LO12_NC",
+            elf.R_AARCH64_MOVW_PREL_G0 => "R_AARCH64_MOVW_PREL_G0",
+            elf.R_AARCH64_MOVW_PREL_G0_NC => "R_AARCH64_MOVW_PREL_G0_NC",
+            elf.R_AARCH64_MOVW_PREL_G1 => "R_AARCH64_MOVW_PREL_G1",
+            elf.R_AARCH64_MOVW_PREL_G1_NC => "R_AARCH64_MOVW_PREL_G1_NC",
+            elf.R_AARCH64_MOVW_PREL_G2 => "R_AARCH64_MOVW_PREL_G2",
+            elf.R_AARCH64_MOVW_PREL_G2_NC => "R_AARCH64_MOVW_PREL_G2_NC",
+            elf.R_AARCH64_MOVW_PREL_G3 => "R_AARCH64_MOVW_PREL_G3",
+            elf.R_AARCH64_LDST128_ABS_LO12_NC => "R_AARCH64_LDST128_ABS_LO12_NC",
+            elf.R_AARCH64_MOVW_GOTOFF_G0 => "R_AARCH64_MOVW_GOTOFF_G0",
+            elf.R_AARCH64_MOVW_GOTOFF_G0_NC => "R_AARCH64_MOVW_GOTOFF_G0_NC",
+            elf.R_AARCH64_MOVW_GOTOFF_G1 => "R_AARCH64_MOVW_GOTOFF_G1",
+            elf.R_AARCH64_MOVW_GOTOFF_G1_NC => "R_AARCH64_MOVW_GOTOFF_G1_NC",
+            elf.R_AARCH64_MOVW_GOTOFF_G2 => "R_AARCH64_MOVW_GOTOFF_G2",
+            elf.R_AARCH64_MOVW_GOTOFF_G2_NC => "R_AARCH64_MOVW_GOTOFF_G2_NC",
+            elf.R_AARCH64_MOVW_GOTOFF_G3 => "R_AARCH64_MOVW_GOTOFF_G3",
+            elf.R_AARCH64_GOTREL64 => "R_AARCH64_GOTREL64",
+            elf.R_AARCH64_GOTREL32 => "R_AARCH64_GOTREL32",
+            elf.R_AARCH64_GOT_LD_PREL19 => "R_AARCH64_GOT_LD_PREL19",
+            elf.R_AARCH64_LD64_GOTOFF_LO15 => "R_AARCH64_LD64_GOTOFF_LO15",
+            elf.R_AARCH64_ADR_GOT_PAGE => "R_AARCH64_ADR_GOT_PAGE",
+            elf.R_AARCH64_LD64_GOT_LO12_NC => "R_AARCH64_LD64_GOT_LO12_NC",
+            elf.R_AARCH64_LD64_GOTPAGE_LO15 => "R_AARCH64_LD64_GOTPAGE_LO15",
+            elf.R_AARCH64_TLSGD_ADR_PREL21 => "R_AARCH64_TLSGD_ADR_PREL21",
+            elf.R_AARCH64_TLSGD_ADR_PAGE21 => "R_AARCH64_TLSGD_ADR_PAGE21",
+            elf.R_AARCH64_TLSGD_ADD_LO12_NC => "R_AARCH64_TLSGD_ADD_LO12_NC",
+            elf.R_AARCH64_TLSGD_MOVW_G1 => "R_AARCH64_TLSGD_MOVW_G1",
+            elf.R_AARCH64_TLSGD_MOVW_G0_NC => "R_AARCH64_TLSGD_MOVW_G0_NC",
+            elf.R_AARCH64_TLSLD_ADR_PREL21 => "R_AARCH64_TLSLD_ADR_PREL21",
+            elf.R_AARCH64_TLSLD_ADR_PAGE21 => "R_AARCH64_TLSLD_ADR_PAGE21",
+            elf.R_AARCH64_TLSLD_ADD_LO12_NC => "R_AARCH64_TLSLD_ADD_LO12_NC",
+            elf.R_AARCH64_TLSLD_MOVW_G1 => "R_AARCH64_TLSLD_MOVW_G1",
+            elf.R_AARCH64_TLSLD_MOVW_G0_NC => "R_AARCH64_TLSLD_MOVW_G0_NC",
+            elf.R_AARCH64_TLSLD_LD_PREL19 => "R_AARCH64_TLSLD_LD_PREL19",
+            elf.R_AARCH64_TLSLD_MOVW_DTPREL_G2 => "R_AARCH64_TLSLD_MOVW_DTPREL_G2",
+            elf.R_AARCH64_TLSLD_MOVW_DTPREL_G1 => "R_AARCH64_TLSLD_MOVW_DTPREL_G1",
+            elf.R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC => "R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC",
+            elf.R_AARCH64_TLSLD_MOVW_DTPREL_G0 => "R_AARCH64_TLSLD_MOVW_DTPREL_G0",
+            elf.R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC => "R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC",
+            elf.R_AARCH64_TLSLD_ADD_DTPREL_HI12 => "R_AARCH64_TLSLD_ADD_DTPREL_HI12",
+            elf.R_AARCH64_TLSLD_ADD_DTPREL_LO12 => "R_AARCH64_TLSLD_ADD_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC => "R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC",
+            elf.R_AARCH64_TLSLD_LDST8_DTPREL_LO12 => "R_AARCH64_TLSLD_LDST8_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC => "R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC",
+            elf.R_AARCH64_TLSLD_LDST16_DTPREL_LO12 => "R_AARCH64_TLSLD_LDST16_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC => "R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC",
+            elf.R_AARCH64_TLSLD_LDST32_DTPREL_LO12 => "R_AARCH64_TLSLD_LDST32_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC => "R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC",
+            elf.R_AARCH64_TLSLD_LDST64_DTPREL_LO12 => "R_AARCH64_TLSLD_LDST64_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC => "R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC",
+            elf.R_AARCH64_TLSIE_MOVW_GOTTPREL_G1 => "R_AARCH64_TLSIE_MOVW_GOTTPREL_G1",
+            elf.R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC => "R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC",
+            elf.R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21 => "R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21",
+            elf.R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC => "R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC",
+            elf.R_AARCH64_TLSIE_LD_GOTTPREL_PREL19 => "R_AARCH64_TLSIE_LD_GOTTPREL_PREL19",
+            elf.R_AARCH64_TLSLE_MOVW_TPREL_G2 => "R_AARCH64_TLSLE_MOVW_TPREL_G2",
+            elf.R_AARCH64_TLSLE_MOVW_TPREL_G1 => "R_AARCH64_TLSLE_MOVW_TPREL_G1",
+            elf.R_AARCH64_TLSLE_MOVW_TPREL_G1_NC => "R_AARCH64_TLSLE_MOVW_TPREL_G1_NC",
+            elf.R_AARCH64_TLSLE_MOVW_TPREL_G0 => "R_AARCH64_TLSLE_MOVW_TPREL_G0",
+            elf.R_AARCH64_TLSLE_MOVW_TPREL_G0_NC => "R_AARCH64_TLSLE_MOVW_TPREL_G0_NC",
+            elf.R_AARCH64_TLSLE_ADD_TPREL_HI12 => "R_AARCH64_TLSLE_ADD_TPREL_HI12",
+            elf.R_AARCH64_TLSLE_ADD_TPREL_LO12 => "R_AARCH64_TLSLE_ADD_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_ADD_TPREL_LO12_NC => "R_AARCH64_TLSLE_ADD_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSLE_LDST8_TPREL_LO12 => "R_AARCH64_TLSLE_LDST8_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC => "R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSLE_LDST16_TPREL_LO12 => "R_AARCH64_TLSLE_LDST16_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC => "R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSLE_LDST32_TPREL_LO12 => "R_AARCH64_TLSLE_LDST32_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC => "R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSLE_LDST64_TPREL_LO12 => "R_AARCH64_TLSLE_LDST64_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC => "R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSDESC_LD_PREL19 => "R_AARCH64_TLSDESC_LD_PREL19",
+            elf.R_AARCH64_TLSDESC_ADR_PREL21 => "R_AARCH64_TLSDESC_ADR_PREL21",
+            elf.R_AARCH64_TLSDESC_ADR_PAGE21 => "R_AARCH64_TLSDESC_ADR_PAGE21",
+            elf.R_AARCH64_TLSDESC_LD64_LO12 => "R_AARCH64_TLSDESC_LD64_LO12",
+            elf.R_AARCH64_TLSDESC_ADD_LO12 => "R_AARCH64_TLSDESC_ADD_LO12",
+            elf.R_AARCH64_TLSDESC_OFF_G1 => "R_AARCH64_TLSDESC_OFF_G1",
+            elf.R_AARCH64_TLSDESC_OFF_G0_NC => "R_AARCH64_TLSDESC_OFF_G0_NC",
+            elf.R_AARCH64_TLSDESC_LDR => "R_AARCH64_TLSDESC_LDR",
+            elf.R_AARCH64_TLSDESC_ADD => "R_AARCH64_TLSDESC_ADD",
+            elf.R_AARCH64_TLSDESC_CALL => "R_AARCH64_TLSDESC_CALL",
+            elf.R_AARCH64_TLSLE_LDST128_TPREL_LO12 => "R_AARCH64_TLSLE_LDST128_TPREL_LO12",
+            elf.R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC => "R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC",
+            elf.R_AARCH64_TLSLD_LDST128_DTPREL_LO12 => "R_AARCH64_TLSLD_LDST128_DTPREL_LO12",
+            elf.R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC => "R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC",
+            elf.R_AARCH64_COPY => "R_AARCH64_COPY",
+            elf.R_AARCH64_GLOB_DAT => "R_AARCH64_GLOB_DAT",
+            elf.R_AARCH64_JUMP_SLOT => "R_AARCH64_JUMP_SLOT",
+            elf.R_AARCH64_RELATIVE => "R_AARCH64_RELATIVE",
+            elf.R_AARCH64_TLS_DTPMOD => "R_AARCH64_TLS_DTPMOD",
+            elf.R_AARCH64_TLS_DTPREL => "R_AARCH64_TLS_DTPREL",
+            elf.R_AARCH64_TLS_TPREL => "R_AARCH64_TLS_TPREL",
+            elf.R_AARCH64_TLSDESC => "R_AARCH64_TLSDESC",
+            elf.R_AARCH64_IRELATIVE => "R_AARCH64_IRELATIVE",
+            else => "R_AARCH64_UNKNOWN",
+        },
+        else => unreachable,
+    };
+    try writer.print("{s}", .{str});
+}
+
+const assert = std.debug.assert;
+const elf = std.elf;
+const std = @import("std");