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stage2: sparc64: Factor machine offset calculation

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This commit is contained in:
Koakuma
2023-01-04 12:53:11 +07:00
committed by Andrew Kelley
parent cc2a5185d6
commit 486ab3852e
1 changed files with 16 additions and 3 deletions
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19
src/arch/sparc64/CodeGen.zig
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@@ -141,6 +141,8 @@ const MCValue = union(enum) {
/// The value is one of the stack variables.
/// If the type is a pointer, it means the pointer address is in the stack at this offset.
/// Note that this stores the plain value (i.e without the effects of the stack bias).
/// Always convert this value into machine offsets with realStackOffset() before
/// lowering into asm!
stack_offset: u32,
/// The value is a pointer to one of the stack variables (payload is stack offset).
ptr_stack_offset: u32,
@@ -3651,7 +3653,7 @@ fn genSetReg(self: *Self, ty: Type, reg: Register, mcv: MCValue) InnerError!void
return self.genSetReg(ty, reg, .{ .immediate = 0xaaaaaaaaaaaaaaaa });
},
.ptr_stack_offset => |off| {
const real_offset = off + abi.stack_bias + abi.stack_reserved_area;
const real_offset = realStackOffset(off);
const simm13 = math.cast(i13, real_offset) orelse
return self.fail("TODO larger stack offsets: {}", .{real_offset});
@@ -3783,7 +3785,7 @@ fn genSetReg(self: *Self, ty: Type, reg: Register, mcv: MCValue) InnerError!void
try self.genLoad(reg, reg, i13, 0, ty.abiSize(self.target.*));
},
.stack_offset => |off| {
const real_offset = off + abi.stack_bias + abi.stack_reserved_area;
const real_offset = realStackOffset(off);
const simm13 = math.cast(i13, real_offset) orelse
return self.fail("TODO larger stack offsets: {}", .{real_offset});
try self.genLoad(reg, .sp, i13, simm13, ty.abiSize(self.target.*));
@@ -3817,7 +3819,7 @@ fn genSetStack(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerErro
return self.genSetStack(ty, stack_offset, MCValue{ .register = reg });
},
.register => |reg| {
const real_offset = stack_offset + abi.stack_bias + abi.stack_reserved_area;
const real_offset = realStackOffset(stack_offset);
const simm13 = math.cast(i13, real_offset) orelse
return self.fail("TODO larger stack offsets: {}", .{real_offset});
return self.genStore(reg, .sp, i13, simm13, abi_size);
@@ -4252,6 +4254,17 @@ fn processDeath(self: *Self, inst: Air.Inst.Index) void {
}
}
/// Turns stack_offset MCV into a real SPARCv9 stack offset usable for asm.
fn realStackOffset(off: u32) u32 {
return off
// SPARCv9 %sp points away from the stack by some amount.
+ abi.stack_bias
// The first couple bytes of each stack frame is reserved
// for ABI and hardware purposes.
+ abi.stack_reserved_area;
// Only after that we have the usable stack frame portion.
}
/// Caller must call `CallMCValues.deinit`.
fn resolveCallingConventionValues(self: *Self, fn_ty: Type, role: RegisterView) !CallMCValues {
const cc = fn_ty.fnCallingConvention();