| Commit message (Expand) | Author | Age | Files | Lines |
|---|
| * | setjmp: optimize longjmp prologues•••Use a branchless sequence that is one byte shorter on 64-bit, same size
on 32-bit. Thanks to Pete Cawley for suggesting this variant.
| Alexander Monakov | 2020-08-12 | 1 | -5/+3 |
| * | setjmp: optimize x86 longjmp epilogues | Alexander Monakov | 2020-08-11 | 1 | -4/+2 |
| * | setjmp: avoid useless REX-prefix on xor %eax, %eax | Alexander Monakov | 2020-08-11 | 1 | -1/+1 |
| * | setjmp: fix x86-64 longjmp argument adjustment•••longjmp 'val' argument is an int, but the assembly is referencing 64-bit
registers as if the argument was a long, or the caller was responsible
for extending the argument. Though the psABI is not clear on this, the
interpretation in GCC is that high bits may be arbitrary and the callee
is responsible for sign/zero-extending the value as needed (likewise for
return values: callers must anticipate that high bits may be garbage).
Therefore testing %rax is a functional bug: setjmp would wrongly return
zero if longjmp was called with val==0, but high bits of %rsi happened
to be non-zero.
Rewrite the prologue to refer to 32-bit registers. In passing, change
'test' to use %rsi, as there's no advantage to using %rax and the new
form is cheaper on processors that do not perform move elimination.
| Alexander Monakov | 2020-08-11 | 1 | -3/+3 |
| * | update license of njk contributed code (x86_64 asm)•••these changes are based on the following communication via email:
"I hereby grant that all of the code I have contributed to musl on or
before April 23, 2012 may be licensed under the terms of the following
MIT license:
Copyright (c) 2011-2012 Nicholas J. Kain
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE."
| Rich Felker | 2012-05-05 | 2 | -2/+2 |
| * | restore use of .type in asm, but use modern @function (vs %function)•••this seems to be necessary to make the linker accept the functions in
a shared library (perhaps to generate PLT entries?)
strictly speaking libc-internal asm should not need it. i might clean
that up later.
| Rich Felker | 2011-06-14 | 2 | -0/+5 |
| * | remove all .size and .type directives for functions from the asm•••these are useless and have caused problems for users trying to build
with non-gnu tools like tcc's assembler.
| Rich Felker | 2011-06-13 | 2 | -10/+0 |
| * | modernize coding style in sjlj asm | Rich Felker | 2011-05-26 | 2 | -12/+12 |
| * | Port musl to x86-64. One giant commit! | Nicholas J. Kain | 2011-02-15 | 2 | -0/+49 |
