50fcab2984
Implement the tls_value for s390 in the ELF general-dynamic mode. Notable differences to the x86_64 implementation are: - We use a __tls_get_offset libcall instead of __tls_get_addr. - The current thread pointer (stored in a pair of access registers) needs to be added to the result of __tls_get_offset. - __tls_get_offset has a variant ABI that requires the address of the GOT (global offset table) is passed in %r12. This means we need a new libcall entries for __tls_get_offset. In addition, we also need a way to access _GLOBAL_OFFSET_TABLE_. The latter is a "magic" symbol with a well-known name defined by the ABI and recognized by the linker. This patch introduces a new ExternalName::KnownSymbol variant to support such names (originally due to @afonso360). We also need to emit a relocation on a symbol placed in a constant pool, as well as an extra relocation on the call to __tls_get_offset required for TLS linker optimization. Needed by the cg_clif frontend.
84 lines
3.0 KiB
Rust
84 lines
3.0 KiB
Rust
//! Top-level lib.rs for `cranelift_module`.
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#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
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#![warn(unused_import_braces)]
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#![cfg_attr(feature = "std", deny(unstable_features))]
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#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
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#![cfg_attr(feature = "cargo-clippy", allow(clippy::new_without_default))]
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#![cfg_attr(
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feature = "cargo-clippy",
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warn(
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clippy::float_arithmetic,
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clippy::mut_mut,
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clippy::nonminimal_bool,
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clippy::map_unwrap_or,
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clippy::clippy::print_stdout,
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clippy::unicode_not_nfc,
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clippy::use_self
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)
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)]
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#![no_std]
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#[cfg(not(feature = "std"))]
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#[macro_use]
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extern crate alloc as std;
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#[cfg(feature = "std")]
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#[macro_use]
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extern crate std;
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#[cfg(not(feature = "std"))]
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use hashbrown::{hash_map, HashMap};
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use std::borrow::ToOwned;
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use std::boxed::Box;
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#[cfg(feature = "std")]
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use std::collections::{hash_map, HashMap};
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use std::string::String;
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use cranelift_codegen::ir;
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mod data_context;
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mod module;
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mod traps;
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pub use crate::data_context::{DataContext, DataDescription, Init};
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pub use crate::module::{
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DataId, FuncId, FuncOrDataId, Linkage, Module, ModuleCompiledFunction, ModuleDeclarations,
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ModuleError, ModuleResult,
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};
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pub use crate::traps::TrapSite;
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/// Version number of this crate.
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pub const VERSION: &str = env!("CARGO_PKG_VERSION");
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/// Default names for `ir::LibCall`s. A function by this name is imported into the object as
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/// part of the translation of a `ir::ExternalName::LibCall` variant.
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pub fn default_libcall_names() -> Box<dyn Fn(ir::LibCall) -> String + Send + Sync> {
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Box::new(move |libcall| match libcall {
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ir::LibCall::Probestack => "__cranelift_probestack".to_owned(),
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ir::LibCall::UdivI64 => "__udivdi3".to_owned(),
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ir::LibCall::SdivI64 => "__divdi3".to_owned(),
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ir::LibCall::UremI64 => "__umoddi3".to_owned(),
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ir::LibCall::SremI64 => "__moddi3".to_owned(),
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ir::LibCall::IshlI64 => "__ashldi3".to_owned(),
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ir::LibCall::UshrI64 => "__lshrdi3".to_owned(),
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ir::LibCall::SshrI64 => "__ashrdi3".to_owned(),
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ir::LibCall::CeilF32 => "ceilf".to_owned(),
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ir::LibCall::CeilF64 => "ceil".to_owned(),
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ir::LibCall::FloorF32 => "floorf".to_owned(),
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ir::LibCall::FloorF64 => "floor".to_owned(),
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ir::LibCall::TruncF32 => "truncf".to_owned(),
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ir::LibCall::TruncF64 => "trunc".to_owned(),
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ir::LibCall::NearestF32 => "nearbyintf".to_owned(),
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ir::LibCall::NearestF64 => "nearbyint".to_owned(),
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ir::LibCall::FmaF32 => "fmaf".to_owned(),
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ir::LibCall::FmaF64 => "fma".to_owned(),
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ir::LibCall::Memcpy => "memcpy".to_owned(),
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ir::LibCall::Memset => "memset".to_owned(),
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ir::LibCall::Memmove => "memmove".to_owned(),
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ir::LibCall::Memcmp => "memcmp".to_owned(),
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ir::LibCall::ElfTlsGetAddr => "__tls_get_addr".to_owned(),
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ir::LibCall::ElfTlsGetOffset => "__tls_get_offset".to_owned(),
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})
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}
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