linux-5.4: backport modpost upstream patches

Fixes modpost Segmentation Fault with bcm2708 and bcm2709:
  MODPOST vmlinux.o
  Segmentation fault
  make[6]: *** [scripts/Makefile.modpost:66: __modpost] Error 139

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch b/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch
new file mode 100644
index 0000000000..cf88c0c69f
--- /dev/null
+++ b/target/linux/generic/backport-5.4/030-modpost-add-a-helper-to-get-data-pointed-by-a-symbol.patch
@@ -0,0 +1,53 @@
+From afa0459daa7b08c7b2c879705b69d39b734a11d0 Mon Sep 17 00:00:00 2001
+From: Masahiro Yamada <yamada.masahiro@socionext.com>
+Date: Fri, 15 Nov 2019 02:42:21 +0900
+Subject: [PATCH] modpost: add a helper to get data pointed by a symbol
+
+When CONFIG_MODULE_REL_CRCS is enabled, the value of __crc_* is not
+an absolute value, but the address to the CRC data embedded in the
+.rodata section.
+
+Getting the data pointed by the symbol value is somewhat complex.
+Split it out into a new helper, sym_get_data().
+
+I will reuse it to refactor namespace_from_kstrtabns() in the next
+commit.
+
+Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
+---
+ scripts/mod/modpost.c | 17 +++++++++++++----
+ 1 file changed, 13 insertions(+), 4 deletions(-)
+
+--- a/scripts/mod/modpost.c
++++ b/scripts/mod/modpost.c
+@@ -312,6 +312,18 @@ static const char *sec_name(struct elf_i
+ 	return sech_name(elf, &elf->sechdrs[secindex]);
+ }
+ 
++static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym)
++{
++	Elf_Shdr *sechdr = &info->sechdrs[sym->st_shndx];
++	unsigned long offset;
++
++	offset = sym->st_value;
++	if (info->hdr->e_type != ET_REL)
++		offset -= sechdr->sh_addr;
++
++	return (void *)info->hdr + sechdr->sh_offset + offset;
++}
++
+ #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
+ 
+ static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
+@@ -701,10 +713,7 @@ static void handle_modversions(struct mo
+ 			unsigned int *crcp;
+ 
+ 			/* symbol points to the CRC in the ELF object */
+-			crcp = (void *)info->hdr + sym->st_value +
+-			       info->sechdrs[sym->st_shndx].sh_offset -
+-			       (info->hdr->e_type != ET_REL ?
+-				info->sechdrs[sym->st_shndx].sh_addr : 0);
++			crcp = sym_get_data(info, sym);
+ 			crc = TO_NATIVE(*crcp);
+ 		}
+ 		sym_update_crc(symname + strlen("__crc_"), mod, crc,