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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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| alpha | ||
| arm | ||
| bsd | ||
| i386 | ||
| inet | ||
| mips | ||
| powerpc | ||
| sh | ||
| sysv/linux | ||
| x86_64 | ||
| clock_gettime.c | ||
| clock_nanosleep.c | ||
| clock_settime.c | ||
| confstr.h | ||
| get_child_max.c | ||
| getlogin_r.c | ||
| getlogin.c | ||
| getpagesize.c | ||
| grantpt.c | ||
| ifreq.c | ||
| Implies | ||
| make-syscalls.sh | ||
| Makefile | ||
| pt-fcntl.c | ||
| s-proto-cancel.S | ||
| s-proto.S | ||
| setxid.h | ||
| sockatmark.c | ||
| stime.c | ||
| syscall-template.S | ||
| syscall.S | ||
| syscalls.list | ||
| sysdep.h | ||