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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2008-12-03 19:40:55 +0000
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2008-12-03 19:40:55 +0000
commitce54b92b046b65464e2d16b3842f3e97e3e0f27e (patch)
tree5d840e5451b4259c8ff17b33883256ec24e6de9d /ldso/man
parent6b497bfbe9428312f56bad4c1a288516882ef689 (diff)
- Use runtime pagesize (Jeremy Kerr)
Some powerpc machines can support 64k pages, enabled by the CONFIG_64K_PAGES option in linux. However, the uClibc dynamic loader won't currently work on these machines, as it uses hard-coded values (PAGE_ALIGN, ADDR_ALIGN and OFFS_ALIGN) in the ldso architecture-specific headers. When running on a kernel with 64k pages, ld.so tries to mmap with 4k-aligned addresses, rather than 64k, so mmap fails with -EINVAL. When booting a 64k machine with a uClibc dynamic linker, init fails with: /init:500: can't map '/lib/libc.so.0' /init:500: can't map '/lib/libc.so.0' /init:500: can't map '/lib/libc.so.0' /init: can't load library 'libc.so.0' Kernel panic - not syncing: Attempted to kill init! This change allows ld.so determine these alignment masks at runtime, rather than compile-time. Since we have the _dl_pagesize variable available, we can use that to generate the appropriate masks. Since almost all of the architectures can use the common definitions for the _ALIGN macros, we can consolidate them all in ldso.h, and override in the sysdep headers where necessary (ie, mips). This allows me to start a uClibc-based root fs on a 64k machine. Signed-off-by: Jeremy Kerr <jk at ozlabs org>
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