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fix #498 by specifying section references using a named label #499

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fix #498 by specifying section references using a named label #499

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8 changes: 5 additions & 3 deletions usdt-impl/src/stapsdt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -153,15 +153,15 @@ fn emit_probe_record(prov: &str, probe: &str, types: Option<&[DataType]>) -> Str
.popsection
.endif
// Second define the actual USDT probe
.pushsection .note.stapsdt, "", "note"
.pushsection .note.stapsdt, "o", "note", .Lprobe_{label}
.balign 4
.4byte 992f-991f, 994f-993f, 3 // length, type
991:
.asciz "stapsdt" // vendor string
992:
.balign 4
993:
.8byte 990b // probe PC address
.8byte .Lprobe_{label} // probe PC address
.8byte _.stapsdt.base // link-time sh_addr of base .stapsdt.base section
.8byte {sema_name} // probe semaphore address
.asciz "{prov}" // provider name
Expand Down Expand Up @@ -223,9 +223,11 @@ fn compile_probe(
#[allow(named_asm_labels)]
unsafe {
::std::arch::asm!(
"990: nop",
".Lprobe_{label}: nop",
#probe_rec,
#in_regs
// hack to get a unique label name.
label = label {},
options(nomem, nostack, preserves_flags)
);
}
Expand Down