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sysprog21 / semu

A minimalist RISC-V system emulator capable of running Linux kernel
MIT License
253 stars 47 forks source link

Bump Buildroot version and select GCC 14 with binutils 2.42 #52

Closed shengwen-tw closed 3 months ago

shengwen-tw commented 3 months ago

This commit intends to avoid a recent glibc bug that mistakenly uses 64-bit time on 32-bit machines.

Consider the Linux input_event structure:

struct input_event {
    struct timeval time;
    __u16 type;
    __u16 code;
    __s32 value;
};

On RV32 Linux, the total size of this structure should be 16 bytes (8+2+2+4). However, due to a known glibc bug [2] that incorrectly utilizes the 64-bit time type, the actual size of the structure becomes 24 bytes (16+2+2+4).

Without this fix, the bug would affect the usage of DirectFB2 in the semu project. Fortunately, upgrading the toolchain version resolves the issue.

[1] https://lore.kernel.org/lkml/caa041d27b0fa45aad09a9a262038e3ae4099ca2.camel@mwa.re/T/ [2] https://sourceware.org/pipermail/libc-help/2024-January/006563.html

jserv commented 3 months ago

Thank @shengwen-tw for contributing!