Hi, enabling squashfs on my target (vocore2) result in multiple errors:
/home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o: in function `sqfs_calc_n_blks': fs/squashfs/sqfs.c:(.text.sqfs_calc_n_blks+0x44): undefined reference to `__umoddi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/squashfs/sqfs.c:(.text.sqfs_calc_n_blks+0x98): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o: in function `sqfs_frag_lookup': fs/squashfs/sqfs.c:(.text.sqfs_frag_lookup+0x74): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/squashfs/sqfs.c:(.text.sqfs_frag_lookup+0x1b0): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o: in function `sqfs_opendir': (.text.sqfs_opendir+0xbc): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: (.text.sqfs_opendir+0x178): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o:(.text.sqfs_read+0x324): more undefined references to `__udivdi3' follow /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o: in function `sqfs_read': (.text.sqfs_read+0x348): undefined reference to `__umoddi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: (.text.sqfs_read+0x388): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: (.text.sqfs_read+0x5bc): undefined reference to `__umoddi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: (.text.sqfs_read+0x600): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: (.text.sqfs_read+0x64c): undefined reference to `__udivdi3' /home/mcon/vocore/__V2__/Buildroot-2/recov/per-package/uboot/host/bin/mipsel-linux-ld.bfd: fs/built-in.o: in function `sqfs_inode_size': (.text.sqfs_inode_size+0x140): undefined reference to `__udivdi3' make[2]: *** [Makefile:1753: u-boot] Error 1 make[1]: *** [package/pkg-generic.mk:269: /home/mcon/vocore/__V2__/Buildroot-2/recov/build/uboot-v2020.10-rc3/.stamp_built] Error 2 make: *** [Makefile:23: _all] Error 2
Following some advice on IRC (I can be contacted there as "mcon") I tried to fix issue by explicit calling `lldiv()` (full patch below). Fix allows full compilation, and is also somewhat working: Directory list works, file load does not :(
=> ls mmc 0:6 /boot 0 not_mounted 2512916 uImage
2 file(s), 0 dir(s)
=> load mmc 0:6 85000000 /boot/uImage Failed to load '/boot/uImage'
Here I have two questions: 1) can someone check my patch end tell me where I goofed? 2) is this supposedly the right way to fix? One other suggestion I had on IRC is to simply implement __udivdi3/__umoddi3 in my architecture (i.e.: u-boot/arch/mips/lib), but that doesn't seem like what has been done in other places. I would like to provide an upstreamable patch.
==8<--- Here comes the (tentative) patch==================================
From cfd07aac0aa00345df1a0f2fac04ee549c78f87a Mon Sep 17 00:00:00 2001
From: Mauro Condarelli mc5686@mclink.it Date: Thu, 3 Sep 2020 08:37:58 +0200 Subject: [PATCH 4/4] Fix missing __udivdi3 in SquashFS implementation.
Signed-off-by: Mauro Condarelli mc5686@mclink.it --- fs/squashfs/sqfs.c | 27 ++++++++++++++++----------- fs/squashfs/sqfs_inode.c | 11 +++++++++-- 2 files changed, 25 insertions(+), 13 deletions(-)
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c index f67f7c4a40..12115b6baa 100644 --- a/fs/squashfs/sqfs.c +++ b/fs/squashfs/sqfs.c @@ -23,6 +23,12 @@ #include "sqfs_filesystem.h" #include "sqfs_utils.h" +#include <div64.h> +#ifdef DIV_ROUND_UP +#undef DIV_ROUND_UP +#endif +#define DIV_ROUND_UP(n,d) (lldiv(((n) + (d) - 1), (d))) + static struct squashfs_ctxt ctxt; static int sqfs_disk_read(__u32 block, __u32 nr_blocks, void *buf) @@ -85,7 +91,7 @@ static int sqfs_calc_n_blks(__le64 start, __le64 end, u64 *offset) u64 start_, table_size; table_size = le64_to_cpu(end) - le64_to_cpu(start); - start_ = le64_to_cpu(start) / ctxt.cur_dev->blksz; + start_ = lldiv(le64_to_cpu(start), ctxt.cur_dev->blksz); *offset = le64_to_cpu(start) - (start_ * ctxt.cur_dev->blksz); return DIV_ROUND_UP(table_size + *offset, ctxt.cur_dev->blksz); @@ -109,8 +115,8 @@ static int sqfs_frag_lookup(u32 inode_fragment_index, if (inode_fragment_index >= get_unaligned_le32(&sblk->fragments)) return -EINVAL; - start = get_unaligned_le64(&sblk->fragment_table_start) / - ctxt.cur_dev->blksz; + start = lldiv(get_unaligned_le64(&sblk->fragment_table_start), + ctxt.cur_dev->blksz); n_blks = sqfs_calc_n_blks(sblk->fragment_table_start, sblk->export_table_start, &table_offset); @@ -135,7 +141,7 @@ static int sqfs_frag_lookup(u32 inode_fragment_index, start_block = get_unaligned_le64(table + table_offset + block * sizeof(u64)); - start = start_block / ctxt.cur_dev->blksz; + start = lldiv(start_block, ctxt.cur_dev->blksz); n_blks = sqfs_calc_n_blks(cpu_to_le64(start_block), sblk->fragment_table_start, &table_offset); @@ -641,8 +647,8 @@ static int sqfs_read_inode_table(unsigned char **inode_table) table_size = get_unaligned_le64(&sblk->directory_table_start) - get_unaligned_le64(&sblk->inode_table_start); - start = get_unaligned_le64(&sblk->inode_table_start) / - ctxt.cur_dev->blksz; + start = lldiv(get_unaligned_le64(&sblk->inode_table_start), + ctxt.cur_dev->blksz); n_blks = sqfs_calc_n_blks(sblk->inode_table_start, sblk->directory_table_start, &table_offset); @@ -725,8 +731,8 @@ static int sqfs_read_directory_table(unsigned char **dir_table, u32 **pos_list) /* DIRECTORY TABLE */ table_size = get_unaligned_le64(&sblk->fragment_table_start) - get_unaligned_le64(&sblk->directory_table_start); - start = get_unaligned_le64(&sblk->directory_table_start) / - ctxt.cur_dev->blksz; + start = lldiv(get_unaligned_le64(&sblk->directory_table_start), + ctxt.cur_dev->blksz); n_blks = sqfs_calc_n_blks(sblk->directory_table_start, sblk->fragment_table_start, &table_offset); @@ -1328,7 +1333,7 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len, } for (j = 0; j < datablk_count; j++) { - start = data_offset / ctxt.cur_dev->blksz; + start = lldiv(data_offset, ctxt.cur_dev->blksz); table_size = SQFS_BLOCK_SIZE(finfo.blk_sizes[j]); table_offset = data_offset - (start * ctxt.cur_dev->blksz); n_blks = DIV_ROUND_UP(table_size + table_offset, @@ -1382,7 +1387,7 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len, goto free_buffer; } - start = frag_entry.start / ctxt.cur_dev->blksz; + start = lldiv(frag_entry.start, ctxt.cur_dev->blksz); table_size = SQFS_BLOCK_SIZE(frag_entry.size); table_offset = frag_entry.start - (start * ctxt.cur_dev->blksz); n_blks = DIV_ROUND_UP(table_size + table_offset, ctxt.cur_dev->blksz); diff --git a/fs/squashfs/sqfs_inode.c b/fs/squashfs/sqfs_inode.c index 1387779a85..cfb2b8374c 100644 --- a/fs/squashfs/sqfs_inode.c +++ b/fs/squashfs/sqfs_inode.c @@ -16,6 +16,13 @@ #include "sqfs_filesystem.h" #include "sqfs_utils.h" +#include <div64.h> +#ifdef DIV_ROUND_UP +#undef DIV_ROUND_UP +#endif +#define DIV_ROUND_UP(n,d) (lldiv(((n) + (d) - 1), (d))) + + int sqfs_inode_size(struct squashfs_base_inode *inode, u32 blk_size) { switch (get_unaligned_le16(&inode->inode_type)) { @@ -30,7 +37,7 @@ int sqfs_inode_size(struct squashfs_base_inode *inode, u32 blk_size) unsigned int blk_list_size; if (SQFS_IS_FRAGMENTED(fragment)) - blk_list_size = file_size / blk_size; + blk_list_size = lldiv(file_size, blk_size); else blk_list_size = DIV_ROUND_UP(file_size, blk_size); @@ -70,7 +77,7 @@ int sqfs_inode_size(struct squashfs_base_inode *inode, u32 blk_size) if (fragment == 0xFFFFFFFF) blk_list_size = DIV_ROUND_UP(file_size, blk_size); else - blk_list_size = file_size / blk_size; + blk_list_size = lldiv(file_size, blk_size); return sizeof(*lreg) + blk_list_size * sizeof(u32); }