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stage2 AArch64: update function prologue and epilogue to include stack

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joachimschmidt557 2021-01-17 23:09:08 +01:00
parent ea6f3e3fd1
commit 458011f21f
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1 changed files with 16 additions and 1 deletions
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17
src/codegen.zig
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@ -641,20 +641,33 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
const cc = self.fn_type.fnCallingConvention();
if (cc != .Naked) {
// TODO Finish function prologue and epilogue for aarch64.
// Reserve the stack for local variables, etc.
// stp fp, lr, [sp, #-16]!
// mov fp, sp
// sub sp, sp, #reloc
writeInt(u32, try self.code.addManyAsArray(4), Instruction.stp(
.x29,
.x30,
Register.sp,
Instruction.LoadStorePairOffset.pre_index(-16),
).toU32());
writeInt(u32, try self.code.addManyAsArray(4), Instruction.add(.x29, .xzr, 0, false).toU32());
const backpatch_reloc = self.code.items.len;
try self.code.resize(backpatch_reloc + 4);
try self.dbgSetPrologueEnd();
try self.genBody(self.mod_fn.body);
// Backpatch stack offset
const stack_end = self.max_end_stack;
const aligned_stack_end = mem.alignForward(stack_end, self.stack_align);
if (math.cast(u12, aligned_stack_end)) |size| {
writeInt(u32, self.code.items[backpatch_reloc..][0..4], Instruction.sub(.xzr, .xzr, size, false).toU32());
} else |_| {
return self.failSymbol("TODO AArch64: allow larger stacks", .{});
}
try self.dbgSetEpilogueBegin();
// exitlude jumps
@ -690,6 +703,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
Register.sp,
Instruction.LoadStorePairOffset.post_index(16),
).toU32());
// add sp, sp, #stack_size
writeInt(u32, try self.code.addManyAsArray(4), Instruction.add(.xzr, .xzr, @intCast(u12, aligned_stack_end), false).toU32());
// ret lr
writeInt(u32, try self.code.addManyAsArray(4), Instruction.ret(null).toU32());
} else {