| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | remove the last of possible-textrels from i386 asm | Rich Felker | 2015-04-18 | 1 | -2/+3 |
| | | | | | | | | | | | | | none of these are actual textrels because of ld-time binding performed by -Bsymbolic-functions, but I'm changing them with the goal of making ld-time binding purely an optimization rather than relying on it for semantic purposes. in the case of memmove's call to memcpy, making it explicit that the memmove asm is assuming the forward-copying behavior of the memcpy asm is desirable anyway; in case memcpy is ever changed, the semantic mismatch would be apparent while editing memmcpy.s. | ||||
| * | redesign sigsetjmp so that signal mask is restored after longjmp | Rich Felker | 2015-04-17 | 1 | -8/+16 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | the conventional way to implement sigsetjmp is to save the signal mask then tail-call to setjmp; siglongjmp then restores the signal mask and calls longjmp. the problem with this approach is that a signal already pending, or arriving between unmasking of signals and restoration of the saved stack pointer, will have its signal handler run on the stack that was active before siglongjmp was called. this can lead to unbounded stack usage when siglongjmp is used to leave a signal handler. in the new design, sigsetjmp saves its own return address inside the extended part of the sigjmp_buf (outside the __jmp_buf part used by setjmp) then calls setjmp to save a jmp_buf inside its own execution. it then tail-calls to __sigsetjmp_tail, which uses the return value of setjmp to determine whether to save the current signal mask or restore a previously-saved mask. as an added bonus, this design makes it so that siglongjmp and longjmp are identical. this is useful because the __longjmp_chk function we need to add for ABI-compatibility assumes siglongjmp and longjmp are the same, but for different reasons -- it was designed assuming either can access a flag just past the __jmp_buf indicating whether the signal masked was saved, and act on that flag. however, early versions of musl did not have space past the __jmp_buf for the non-sigjmp_buf version of jmp_buf, so our setjmp cannot store such a flag without risking clobbering memory on (very) old binaries. | ||||
| * | add __sigsetjmp ABI-compat alias for sigsetjmp | Rich Felker | 2014-04-02 | 1 | -0/+3 |
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| * | restore use of .type in asm, but use modern @function (vs %function) | Rich Felker | 2011-06-14 | 2 | -0/+3 |
| | | | | | | | | | 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. | ||||
| * | remove all .size and .type directives for functions from the asm | Rich Felker | 2011-06-13 | 1 | -5/+0 |
| | | | | | | these are useless and have caused problems for users trying to build with non-gnu tools like tcc's assembler. | ||||
| * | fix previous commit that broke sigreturn. looks like the asm is needed. | Rich Felker | 2011-02-13 | 1 | -0/+15 |
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| * | initial check-in, version 0.5.0 v0.5.0 | Rich Felker | 2011-02-12 | 1 | -0/+13 |
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| mirror of git://git.musl-libc.org/musl | Leah Neukirchen |
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