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stage2 macho: Hello, Silicon!

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This commit is contained in:
Jakub Konka
2020-11-25 11:10:17 +01:00
parent 2cd84b1b3f
commit 10942e3f86
2 changed files with 50 additions and 19 deletions
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26
src/codegen.zig
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@@ -1689,6 +1689,7 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
},
.aarch64 => {
try self.genSetReg(inst.base.src, .x30, .{ .memory = got_addr });
// blr x30
writeInt(u32, try self.code.addManyAsArray(4), Instruction.blr(.x30).toU32());
},
else => unreachable, // unsupported architecture on MachO
@@ -2583,10 +2584,27 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
},
.register => return self.fail(src, "TODO implement genSetReg for aarch64 {}", .{mcv}),
.memory => |addr| {
// The value is in memory at a hard-coded address.
// If the type is a pointer, it means the pointer address is at this memory location.
try self.genSetReg(src, reg, .{ .immediate = addr });
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.ldr(reg, .{ .rn = reg }).toU32());
if (self.bin_file.cast(link.File.MachO)) |macho_file| {
// For MachO, the binary, with the exception of object files, has to be a PIE.
// Therefore we cannot load an absolute address.
// Instead, we need to make use of PC-relative addressing.
// if (reg.id() == 0) { // x0 is special-cased
try self.mod_fn.owner_decl.link.macho.addPieFixup(self.bin_file.allocator, .{
.address = addr,
.start = self.code.items.len,
.len = 4,
});
// bl [label]
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.bl(0).toU32());
// } else {
// unreachable; // TODO
// }
} else {
// The value is in memory at a hard-coded address.
// If the type is a pointer, it means the pointer address is at this memory location.
try self.genSetReg(src, reg, .{ .immediate = addr });
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.ldr(reg, .{ .rn = reg }).toU32());
}
},
else => return self.fail(src, "TODO implement genSetReg for aarch64 {}", .{mcv}),
},