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author | Florian Weimer <fweimer@redhat.com> | 2019-10-07 19:03:50 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2019-10-07 19:03:51 +0200 |
commit | 921abe47299255a6480456c98fbb53bdc5db92a2 (patch) | |
tree | e8201c2596a51eacfadcad4f030373fba6df2fad /sysdeps/unix/sysv/linux/microblaze/be/libpthread.abilist | |
parent | 0caab6638e22a301e8aa0b35f790b15aaf0791d9 (diff) | |
download | glibc-921abe47299255a6480456c98fbb53bdc5db92a2.tar.gz glibc-921abe47299255a6480456c98fbb53bdc5db92a2.tar.xz glibc-921abe47299255a6480456c98fbb53bdc5db92a2.zip |
riscv: Remove support for variable page sizes
_dl_var_init is used to patch the read-only data section after relocation. Several architectures use this to update GLRO(page_size) with the correct value for the static dlopen case, where _rtld_global_ro has not been initialized by the dynamic loader. RISC-V does not need this. The RISC-V Instruction Set Manual, Volume II: Privileged Architecture, Document Version 20190608-Priv-MSU-Ratified says this: After much deliberation, we have settled on a conventional page size of 4 KiB for both RV32 and RV64. We expect this decision to ease the porting of low-level runtime software and device drivers. The TLB reach problem is ameliorated by transparent superpage support in modern operating systems [2]. Additionally, multi-level TLB hierarchies are quite inexpensive relative to the multi-level cache hierarchies whose address space they map. [2] Juan Navarro, Sitaram Iyer, Peter Druschel, and Alan Cox. Practical, transparent operating system support for superpages. SIGOPS Oper. Syst. Rev., 36(SI):89–104, December 2002. This means that the initialization of _rtld_global_ro._dl_page_size in elf/rtld.c with EXEC_PAGESIZE is sufficient for RISC-V.
Diffstat (limited to 'sysdeps/unix/sysv/linux/microblaze/be/libpthread.abilist')
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