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_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.
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| .. | ||
| bits | ||
| rv64 | ||
| sys | ||
| atomic-machine.h | ||
| clone.S | ||
| configure | ||
| configure.ac | ||
| dl-cache.h | ||
| flush-icache.c | ||
| getcontext.S | ||
| Implies | ||
| ipc_priv.h | ||
| kernel-features.h | ||
| ldconfig.h | ||
| ldd-rewrite.sed | ||
| localplt.data | ||
| makecontext.c | ||
| Makefile | ||
| readelflib.c | ||
| register-dump.h | ||
| setcontext.S | ||
| shlib-versions | ||
| sigcontextinfo.h | ||
| swapcontext.S | ||
| syscall.c | ||
| sysdep.h | ||
| sysdep.S | ||
| ucontext_i.sym | ||
| ucontext-macros.h | ||
| Versions | ||
| vfork.S | ||