diff options
Diffstat (limited to 'src/inline_asm.rs')
| -rw-r--r-- | src/inline_asm.rs | 214 |
1 files changed, 11 insertions, 203 deletions
diff --git a/src/inline_asm.rs b/src/inline_asm.rs index 0517c609337..331649b2ec2 100644 --- a/src/inline_asm.rs +++ b/src/inline_asm.rs @@ -8,7 +8,6 @@ use rustc_span::sym; use rustc_target::asm::*; use target_lexicon::BinaryFormat; -use crate::global_asm::asm_supported; use crate::prelude::*; enum CInlineAsmOperand<'tcx> { @@ -45,208 +44,11 @@ pub(crate) fn codegen_inline_asm<'tcx>( ) { // FIXME add .eh_frame unwind info directives - if !asm_supported(fx.tcx) { - if template.is_empty() { - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } - - // Used by panic_abort - if template[0] == InlineAsmTemplatePiece::String("int $$0x29".to_string()) { - fx.bcx.ins().trap(TrapCode::User(1)); - return; - } - - // Used by stdarch - if template[0] == InlineAsmTemplatePiece::String("mov ".to_string()) - && matches!( - template[1], - InlineAsmTemplatePiece::Placeholder { - operand_idx: 0, - modifier: Some('r'), - span: _ - } - ) - && template[2] == InlineAsmTemplatePiece::String(", rbx".to_string()) - && template[3] == InlineAsmTemplatePiece::String("\n".to_string()) - && template[4] == InlineAsmTemplatePiece::String("cpuid".to_string()) - && template[5] == InlineAsmTemplatePiece::String("\n".to_string()) - && template[6] == InlineAsmTemplatePiece::String("xchg ".to_string()) - && matches!( - template[7], - InlineAsmTemplatePiece::Placeholder { - operand_idx: 0, - modifier: Some('r'), - span: _ - } - ) - && template[8] == InlineAsmTemplatePiece::String(", rbx".to_string()) - { - assert_eq!(operands.len(), 4); - let (leaf, eax_place) = match operands[1] { - InlineAsmOperand::InOut { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::ax)), - late: _, - ref in_value, - out_place: Some(out_place), - } => ( - crate::base::codegen_operand(fx, in_value).load_scalar(fx), - crate::base::codegen_place(fx, out_place), - ), - _ => unreachable!(), - }; - let ebx_place = match operands[0] { - InlineAsmOperand::Out { - reg: - InlineAsmRegOrRegClass::RegClass(InlineAsmRegClass::X86( - X86InlineAsmRegClass::reg, - )), - late: _, - place: Some(place), - } => crate::base::codegen_place(fx, place), - _ => unreachable!(), - }; - let (sub_leaf, ecx_place) = match operands[2] { - InlineAsmOperand::InOut { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::cx)), - late: _, - ref in_value, - out_place: Some(out_place), - } => ( - crate::base::codegen_operand(fx, in_value).load_scalar(fx), - crate::base::codegen_place(fx, out_place), - ), - _ => unreachable!(), - }; - let edx_place = match operands[3] { - InlineAsmOperand::Out { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::dx)), - late: _, - place: Some(place), - } => crate::base::codegen_place(fx, place), - _ => unreachable!(), - }; - - let (eax, ebx, ecx, edx) = crate::intrinsics::codegen_cpuid_call(fx, leaf, sub_leaf); - - eax_place.write_cvalue(fx, CValue::by_val(eax, fx.layout_of(fx.tcx.types.u32))); - ebx_place.write_cvalue(fx, CValue::by_val(ebx, fx.layout_of(fx.tcx.types.u32))); - ecx_place.write_cvalue(fx, CValue::by_val(ecx, fx.layout_of(fx.tcx.types.u32))); - edx_place.write_cvalue(fx, CValue::by_val(edx, fx.layout_of(fx.tcx.types.u32))); - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } - - // Used by compiler-builtins - if fx.tcx.symbol_name(fx.instance).name.starts_with("___chkstk") { - // ___chkstk, ___chkstk_ms and __alloca are only used on Windows - crate::trap::trap_unimplemented(fx, "Stack probes are not supported"); - return; - } else if fx.tcx.symbol_name(fx.instance).name == "__alloca" { - crate::trap::trap_unimplemented(fx, "Alloca is not supported"); - return; - } - - // Used by core::hint::spin_loop() - if template[0] - == InlineAsmTemplatePiece::String(".insn i 0x0F, 0, x0, x0, 0x010".to_string()) - && template.len() == 1 - { - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } - - // Used by measureme - if template[0] == InlineAsmTemplatePiece::String("xor %eax, %eax".to_string()) - && template[1] == InlineAsmTemplatePiece::String("\n".to_string()) - && template[2] == InlineAsmTemplatePiece::String("mov %rbx, ".to_string()) - && matches!( - template[3], - InlineAsmTemplatePiece::Placeholder { - operand_idx: 0, - modifier: Some('r'), - span: _ - } - ) - && template[4] == InlineAsmTemplatePiece::String("\n".to_string()) - && template[5] == InlineAsmTemplatePiece::String("cpuid".to_string()) - && template[6] == InlineAsmTemplatePiece::String("\n".to_string()) - && template[7] == InlineAsmTemplatePiece::String("mov ".to_string()) - && matches!( - template[8], - InlineAsmTemplatePiece::Placeholder { - operand_idx: 0, - modifier: Some('r'), - span: _ - } - ) - && template[9] == InlineAsmTemplatePiece::String(", %rbx".to_string()) - { - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } else if template[0] == InlineAsmTemplatePiece::String("rdpmc".to_string()) { - // Return zero dummy values for all performance counters - match operands[0] { - InlineAsmOperand::In { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::cx)), - value: _, - } => {} - _ => unreachable!(), - }; - let lo = match operands[1] { - InlineAsmOperand::Out { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::ax)), - late: true, - place: Some(place), - } => crate::base::codegen_place(fx, place), - _ => unreachable!(), - }; - let hi = match operands[2] { - InlineAsmOperand::Out { - reg: InlineAsmRegOrRegClass::Reg(InlineAsmReg::X86(X86InlineAsmReg::dx)), - late: true, - place: Some(place), - } => crate::base::codegen_place(fx, place), - _ => unreachable!(), - }; - - let u32_layout = fx.layout_of(fx.tcx.types.u32); - let zero = fx.bcx.ins().iconst(types::I32, 0); - lo.write_cvalue(fx, CValue::by_val(zero, u32_layout)); - hi.write_cvalue(fx, CValue::by_val(zero, u32_layout)); - - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } else if template[0] == InlineAsmTemplatePiece::String("lock xadd ".to_string()) - && matches!( - template[1], - InlineAsmTemplatePiece::Placeholder { operand_idx: 1, modifier: None, span: _ } - ) - && template[2] == InlineAsmTemplatePiece::String(", (".to_string()) - && matches!( - template[3], - InlineAsmTemplatePiece::Placeholder { operand_idx: 0, modifier: None, span: _ } - ) - && template[4] == InlineAsmTemplatePiece::String(")".to_string()) - { - let destination_block = fx.get_block(destination.unwrap()); - fx.bcx.ins().jump(destination_block, &[]); - return; - } - - if cfg!(not(feature = "inline_asm")) { - fx.tcx.sess.span_err( - span, - "asm! and global_asm! support is disabled while compiling rustc_codegen_cranelift", - ); - } else { - fx.tcx.sess.span_err(span, "asm! and global_asm! are not yet supported on Windows"); - } + // Used by panic_abort on Windows, but uses a syntax which only happens to work with + // asm!() by accident and breaks with the GNU assembler as well as global_asm!() for + // the LLVM backend. + if template[0] == InlineAsmTemplatePiece::String("int $$0x29".to_string()) { + fx.bcx.ins().trap(TrapCode::User(1)); return; } @@ -280,6 +82,12 @@ pub(crate) fn codegen_inline_asm<'tcx>( CInlineAsmOperand::Const { value } } InlineAsmOperand::SymFn { ref value } => { + if cfg!(not(feature = "inline_asm_sym")) { + fx.tcx + .sess + .span_err(span, "asm! and global_asm! sym operands are not yet supported"); + } + let const_ = fx.monomorphize(value.const_); if let ty::FnDef(def_id, args) = *const_.ty().kind() { let instance = ty::Instance::resolve_for_fn_ptr( |