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stage2 AArch64: add very basic return values

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This commit is contained in:
joachimschmidt557
2021-01-16 14:15:40 +01:00
committed by Andrew Kelley
parent b204ea0349
commit fbd5fbe729
2 changed files with 31 additions and 16 deletions
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20
src/codegen.zig
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@@ -2935,8 +2935,10 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
).toU32());
// ldr x28, [sp], #16
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.ldr(.x28, .{
.rn = Register.sp,
.offset = Instruction.LoadStoreOffset.imm_post_index(16),
.register = .{
.rn = Register.sp,
.offset = Instruction.LoadStoreOffset.imm_post_index(16),
},
}).toU32());
} else {
// stp x0, x28, [sp, #-16]
@@ -2978,7 +2980,7 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
// 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());
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.ldr(reg, .{ .register = .{ .rn = reg } }).toU32());
}
},
else => return self.fail(src, "TODO implement genSetReg for aarch64 {}", .{mcv}),
@@ -3620,6 +3622,18 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
},
else => return self.fail(src, "TODO implement function return values for {}", .{cc}),
},
.aarch64 => switch (cc) {
.Naked => unreachable,
.Unspecified, .C => {
const ret_ty_size = @intCast(u32, ret_ty.abiSize(self.target.*));
if (ret_ty_size <= 8) {
result.return_value = .{ .register = c_abi_int_return_regs[0] };
} else {
return self.fail(src, "TODO support more return types for ARM backend", .{});
}
},
else => return self.fail(src, "TODO implement function return values for {}", .{cc}),
},
else => return self.fail(src, "TODO implement codegen return values for {}", .{self.target.cpu.arch}),
}
return result;