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Initial libstd support #17

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merged 2 commits into from Aug 6, 2023
Merged

Initial libstd support #17

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02a29af
cargo: support building as part of libstd
xobs Aug 5, 2023
caab987
find_fde: make `text_base` optional
xobs Aug 5, 2023
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3 changes: 3 additions & 0 deletions Cargo.toml
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Expand Up @@ -14,6 +14,8 @@ members = ["cdylib", "example"]
gimli = { version = "0.26.1", default-features = false, features = ["read-core"] }
libc = { version = "0.2", optional = true }
spin = { version = "0.9.8", optional = true, default-features = false, features = ["mutex", "spin_mutex"] }
core = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-core' }
compiler_builtins = { version = "0.1.2", optional = true }

[features]
alloc = []
Expand All @@ -36,6 +38,7 @@ panic-handler = ["print", "panic"]
panic-handler-dummy = []
system-alloc = []
default = ["unwinder", "dwarf-expr", "hide-trace", "fde-phdr-dl", "fde-registry"]
rustc-dep-of-std = ["core", "gimli/rustc-dep-of-std", "compiler_builtins"]

[profile.release]
debug = true
Expand Down
24 changes: 15 additions & 9 deletions src/unwinder/find_fde/custom.rs
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Expand Up @@ -22,7 +22,7 @@ pub unsafe trait EhFrameFinder {
}

pub struct FrameInfo {
pub text_base: usize,
pub text_base: Option<usize>,
pub kind: FrameInfoKind,
}

Expand Down Expand Up @@ -102,13 +102,14 @@ fn find_fde<T: EhFrameFinder + ?Sized>(eh_frame_finder: &T, pc: usize) -> Option

fn find_fde_with_eh_frame_hdr(
pc: usize,
text_base: usize,
text_base: Option<usize>,
eh_frame_hdr: usize,
) -> Option<FDESearchResult> {
unsafe {
let bases = BaseAddresses::default()
.set_text(text_base as _)
.set_eh_frame_hdr(eh_frame_hdr as _);
let mut bases = BaseAddresses::default().set_eh_frame_hdr(eh_frame_hdr as _);
if let Some(text_base) = text_base {
bases = bases.set_text(text_base as _);
}
let eh_frame_hdr = EhFrameHdr::new(
get_unlimited_slice(eh_frame_hdr as usize as _),
NativeEndian,
Expand Down Expand Up @@ -145,11 +146,16 @@ fn find_fde_with_eh_frame_hdr(
}
}

fn find_fde_with_eh_frame(pc: usize, text_base: usize, eh_frame: usize) -> Option<FDESearchResult> {
fn find_fde_with_eh_frame(
pc: usize,
text_base: Option<usize>,
eh_frame: usize,
) -> Option<FDESearchResult> {
unsafe {
let bases = BaseAddresses::default()
.set_text(text_base as _)
.set_eh_frame(eh_frame as _);
let mut bases = BaseAddresses::default().set_eh_frame(eh_frame as _);
if let Some(text_base) = text_base {
bases = bases.set_text(text_base as _);
}
let eh_frame = EhFrame::new(get_unlimited_slice(eh_frame as _), NativeEndian);

if let Ok(fde) = eh_frame.fde_for_address(&bases, pc as _, EhFrame::cie_from_offset) {
Expand Down