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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-03-12 13:21:19 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-03-19 14:53:30 -0300 |
commit | 64c7e344289ed085517c2227d8e3b06388242c13 (patch) | |
tree | 3978be8526aa1137ce5420c32d74b6f5ce656b32 /sysdeps/generic | |
parent | 968b0ca9440040a2b31248a572891f0e55c1ab10 (diff) | |
download | glibc-64c7e344289ed085517c2227d8e3b06388242c13.tar.gz glibc-64c7e344289ed085517c2227d8e3b06388242c13.tar.xz glibc-64c7e344289ed085517c2227d8e3b06388242c13.zip |
arm: Update _dl_tlsdesc_dynamic to preserve caller-saved registers (BZ 31372)
ARM _dl_tlsdesc_dynamic slow path has two issues: * The ip/r12 is defined by AAPCS as a scratch register, and gcc is used to save the stack pointer before on some function calls. So it should also be saved/restored as well. It fixes the tst-gnu2-tls2. * None of the possible VFP registers are saved/restored. ARM has the additional complexity to have different VFP bank sizes (depending of VFP support by the chip). The tst-gnu2-tls2 test is extended to check for VFP registers, although only for hardfp builds. Different than setcontext, _dl_tlsdesc_dynamic does not have HWCAP_ARM_IWMMXT (I don't have a way to properly test it and it is almost a decade since newer hardware was released). With this patch there is no need to mark tst-gnu2-tls2 as XFAIL. Checked on arm-linux-gnueabihf. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Diffstat (limited to 'sysdeps/generic')
0 files changed, 0 insertions, 0 deletions