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pub const Kind = enum {
none,
other,
abs,
copy,
rel,
irel,
glob_dat,
jump_slot,
dtpmod,
dtpoff,
tpoff,
tlsdesc,
};
fn Table(comptime len: comptime_int, comptime RelType: type, comptime mapping: [len]struct { Kind, RelType }) type {
return struct {
fn decode(r_type: u32) Kind {
inline for (mapping) |entry| {
if (@intFromEnum(entry[1]) == r_type) return entry[0];
}
return .other;
}
fn encode(comptime kind: Kind) u32 {
inline for (mapping) |entry| {
if (entry[0] == kind) return @intFromEnum(entry[1]);
}
@panic("encoding .other is ambiguous");
}
};
}
const x86_64_relocs = Table(11, elf.R_X86_64, .{
.{ .none, .NONE },
.{ .abs, .@"64" },
.{ .copy, .COPY },
.{ .rel, .RELATIVE },
.{ .irel, .IRELATIVE },
.{ .glob_dat, .GLOB_DAT },
.{ .jump_slot, .JUMP_SLOT },
.{ .dtpmod, .DTPMOD64 },
.{ .dtpoff, .DTPOFF64 },
.{ .tpoff, .TPOFF64 },
.{ .tlsdesc, .TLSDESC },
});
const aarch64_relocs = Table(11, elf.R_AARCH64, .{
.{ .none, .NONE },
.{ .abs, .ABS64 },
.{ .copy, .COPY },
.{ .rel, .RELATIVE },
.{ .irel, .IRELATIVE },
.{ .glob_dat, .GLOB_DAT },
.{ .jump_slot, .JUMP_SLOT },
.{ .dtpmod, .TLS_DTPMOD },
.{ .dtpoff, .TLS_DTPREL },
.{ .tpoff, .TLS_TPREL },
.{ .tlsdesc, .TLSDESC },
});
const riscv64_relocs = Table(11, elf.R_RISCV, .{
.{ .none, .NONE },
.{ .abs, .@"64" },
.{ .copy, .COPY },
.{ .rel, .RELATIVE },
.{ .irel, .IRELATIVE },
.{ .glob_dat, .@"64" },
.{ .jump_slot, .JUMP_SLOT },
.{ .dtpmod, .TLS_DTPMOD64 },
.{ .dtpoff, .TLS_DTPREL64 },
.{ .tpoff, .TLS_TPREL64 },
.{ .tlsdesc, .TLSDESC },
});
pub fn decode(r_type: u32, cpu_arch: std.Target.Cpu.Arch) ?Kind {
return switch (cpu_arch) {
.x86_64 => x86_64_relocs.decode(r_type),
.aarch64 => aarch64_relocs.decode(r_type),
.riscv64 => riscv64_relocs.decode(r_type),
else => @panic("TODO unhandled cpu arch"),
};
}
pub fn encode(comptime kind: Kind, cpu_arch: std.Target.Cpu.Arch) u32 {
return switch (cpu_arch) {
.x86_64 => x86_64_relocs.encode(kind),
.aarch64 => aarch64_relocs.encode(kind),
.riscv64 => riscv64_relocs.encode(kind),
else => @panic("TODO unhandled cpu arch"),
};
}
pub const dwarf = struct {
pub fn crossSectionRelocType(format: DW.Format, cpu_arch: std.Target.Cpu.Arch) u32 {
return switch (cpu_arch) {
.x86_64 => @intFromEnum(switch (format) {
.@"32" => elf.R_X86_64.@"32",
.@"64" => .@"64",
}),
.riscv64 => @intFromEnum(switch (format) {
.@"32" => elf.R_RISCV.@"32",
.@"64" => .@"64",
}),
else => @panic("TODO unhandled cpu arch"),
};
}
pub fn externalRelocType(
target: Symbol,
source_section: Dwarf.Section.Index,
address_size: Dwarf.AddressSize,
cpu_arch: std.Target.Cpu.Arch,
) u32 {
return switch (cpu_arch) {
.x86_64 => @intFromEnum(@as(elf.R_X86_64, switch (source_section) {
else => switch (address_size) {
.@"32" => if (target.flags.is_tls) .DTPOFF32 else .@"32",
.@"64" => if (target.flags.is_tls) .DTPOFF64 else .@"64",
else => unreachable,
},
.debug_frame => .PC32,
})),
.riscv64 => @intFromEnum(@as(elf.R_RISCV, switch (source_section) {
else => switch (address_size) {
.@"32" => .@"32",
.@"64" => .@"64",
else => unreachable,
},
.debug_frame => unreachable,
})),
else => @panic("TODO unhandled cpu arch"),
};
}
const DW = std.dwarf;
};
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;
switch (ctx.cpu_arch) {
.x86_64 => try writer.print("R_X86_64_{s}", .{@tagName(@as(elf.R_X86_64, @enumFromInt(r_type)))}),
.aarch64 => try writer.print("R_AARCH64_{s}", .{@tagName(@as(elf.R_AARCH64, @enumFromInt(r_type)))}),
.riscv64 => try writer.print("R_RISCV_{s}", .{@tagName(@as(elf.R_RISCV, @enumFromInt(r_type)))}),
else => unreachable,
}
}
const assert = std.debug.assert;
const elf = std.elf;
const std = @import("std");
const Dwarf = @import("../Dwarf.zig");
const Elf = @import("../Elf.zig");
const Symbol = @import("Symbol.zig");
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