On 25 Dec 2024, at 03:04, Chen Qi via lists.openembedded.org <[email protected]> wrote: > When 64K page size is enabled, for 32bit multilib, we'll need to build > applications with 64K alignment, otherwise, we'll see errors like below at > runtime: > > root@marvell-cn10xxx:~# /lib/ld-linux-armhf.so.3 > Segmentation fault > > marvell-cn10xxx in yocto-kernel-cache enables CONFIG_ARM64_4K_PAGES=y by > default. > And the issue was first discovered there.
Do you mean _64K_PAGES? Where is this marvell-cn100xxx? In yocto-kernel-cache there are no users of arm64-64kb-pages and nothing called cn10xxx. Is this a Wind River-specific fork of yocto-kernel-cache? > However, there's a kernel config fragment in yocto-kernel-cache which enableds > 64K page size for arm64: arch/arm/arm64-64kb-pages.scc. So it's easy for other > arm64 BSPs to enable this. And when they do so, they'll have problem with > multilib. This patch adds a config file to help people a little bit in such > situation. > > The max-page-size option is used to fix this issue. This option is added > to both CFLAGS and LDFLAGS for the purpose of covering as many recipes as > possible. First, I should point out that changing the page size is an ABI break, and the 32-bit ABI was formalised long before 64kb pages were a thing, so things _will_ break. That said the loader should work, as a decade ago binutils 2.25 changed the alignment to 64kb pages by default: https://sourceware.org/git/?p=binutils-gdb.git;a=blobdiff;f=ld/emulparams/armelf_linux.sh;h=280db842208e06e3231ec3a8322369193630a07d;hp=35891f1fc91bddd03677aaefd7146ae5333e6cf0;hb=7572ca8989ead4c3425a1500bc241eaaeffa2c89;hpb=8335d6aa34b88ce31b62e1b578d54ab4aa364435 That won’t help specific pieces of software that eg assume the page size is a built-time constant (and use the wrong constant), but helloworld should be good. Can you replicate with pristine poky master and a minimal configuration in a qemu? Ross
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