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Paul Murphy
c340e8a2ba
Sometimes it is necessary to group patchable function entrypoint records in distinct linker sections. This is the case for some bpf functions within the linux kernel which shouldn't be visible to ftrace. Extend `-Zpatchable-function-entry` to accept an argument of the form `prefix_nops,total_nops,record_section`, which places all entry record into a user specified section. Likewise, extend the `patchable_function_entry` attribute to accept an optional `section="name"` option to place a function into a specific section. This is made possible by llvm attribute `patchable-function-entry-section` added in llvm 21.
43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
#![feature(patchable_function_entry)]
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fn main() {}
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#[patchable_function_entry(prefix_nops = 256, entry_nops = 0)]
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//~^ ERROR malformed
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pub fn too_high_pnops() {}
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#[patchable_function_entry(prefix_nops = "stringvalue", entry_nops = 0)]
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//~^ ERROR malformed
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pub fn non_int_nop() {}
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#[patchable_function_entry]
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//~^ ERROR malformed `patchable_function_entry` attribute input
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pub fn malformed_attribute() {}
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#[patchable_function_entry(prefix_nops = 10, something = 0)]
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//~^ ERROR malformed
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pub fn unexpected_parameter_name() {}
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#[patchable_function_entry()]
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//~^ ERROR malformed
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pub fn no_parameters_given() {}
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#[patchable_function_entry(prefix_nops = 255, prefix_nops = 255)]
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//~^ ERROR malformed
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pub fn duplicate_parameter() {}
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#[patchable_function_entry(section = 255)]
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//~^ ERROR malformed
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pub fn invalid_section_parameter() {}
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#[patchable_function_entry(section = "foo", section = "bar")]
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//~^ ERROR malformed
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pub fn duplicate_section_parameter() {}
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#[patchable_function_entry(section = "fo\0o")]
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//~^ ERROR null characters
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pub fn nul_in_section_parameter() {}
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#[patchable_function_entry(section = "")]
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//~^ ERROR empty
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pub fn empty_section_parameter() {}
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