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authorNathan Chancellor <nathan@kernel.org>2024-02-08 03:14:55 +0300
committerHeiko Carstens <hca@linux.ibm.com>2024-02-14 15:50:52 +0300
commit30226853d6ecd274ec35b9d7b8dcdfc1e0981f05 (patch)
tree512f37f571ee4ca28ac2914dc623303b3fbc4c79 /arch/s390/boot
parentbdf2cd27a3293618c794c74bd2f4dee32bc6f477 (diff)
downloadlinux-30226853d6ecd274ec35b9d7b8dcdfc1e0981f05.tar.xz
s390: vmlinux.lds.S: explicitly handle '.got' and '.plt' sections
When building with CONFIG_LD_ORPHAN_WARN after selecting CONFIG_ARCH_HAS_LD_ORPHAN_WARN, there are a lot of warnings around the GOT and PLT sections: s390-linux-ld: warning: orphan section `.plt' from `arch/s390/kernel/head64.o' being placed in section `.plt' s390-linux-ld: warning: orphan section `.got' from `arch/s390/kernel/head64.o' being placed in section `.got' s390-linux-ld: warning: orphan section `.got.plt' from `arch/s390/kernel/head64.o' being placed in section `.got.plt' s390-linux-ld: warning: orphan section `.iplt' from `arch/s390/kernel/head64.o' being placed in section `.iplt' s390-linux-ld: warning: orphan section `.igot.plt' from `arch/s390/kernel/head64.o' being placed in section `.igot.plt' s390-linux-ld: warning: orphan section `.iplt' from `arch/s390/boot/head.o' being placed in section `.iplt' s390-linux-ld: warning: orphan section `.igot.plt' from `arch/s390/boot/head.o' being placed in section `.igot.plt' s390-linux-ld: warning: orphan section `.got' from `arch/s390/boot/head.o' being placed in section `.got' Currently, only the '.got' section is actually emitted in the final binary. In a manner similar to other architectures, put the '.got' section near the '.data' section and coalesce the PLT sections, checking that the final section is zero sized, which is a safe/tested approach versus full discard. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Justin Stitt <justinstitt@google.com> Link: https://lore.kernel.org/r/20240207-s390-lld-and-orphan-warn-v1-3-8a665b3346ab@kernel.org Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/boot')
-rw-r--r--arch/s390/boot/vmlinux.lds.S16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/s390/boot/vmlinux.lds.S b/arch/s390/boot/vmlinux.lds.S
index 389df0e0d9e5..cb4e95c691ae 100644
--- a/arch/s390/boot/vmlinux.lds.S
+++ b/arch/s390/boot/vmlinux.lds.S
@@ -39,6 +39,9 @@ SECTIONS
*(.rodata.*)
_erodata = . ;
}
+ .got : {
+ *(.got)
+ }
NOTES
.data : {
_data = . ;
@@ -118,6 +121,19 @@ SECTIONS
}
_end = .;
+ /*
+ * Sections that should stay zero sized, which is safer to
+ * explicitly check instead of blindly discarding.
+ */
+ .got.plt : {
+ *(.got.plt)
+ }
+ ASSERT(SIZEOF(.got.plt) == 0, "Unexpected GOT/PLT entries detected!")
+ .plt : {
+ *(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
+ }
+ ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
+
/* Sections to be discarded */
/DISCARD/ : {
*(.eh_frame)