mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-12 21:44:06 +08:00
caf539cd10
Older versions of bintutils do not allow symbol math across different
segments on sparc:
====================
Assembler messages:
99: Error: operation combines symbols in different segments
====================
This is controlled by whether or not DIFF_EXPR_OK is defined in
gas/config/tc-*.h and for sparc this was not the case until mid-2017.
So we have to patch between %stick and %tick another way.
Do what powerpc does and emit two versions of the relevant functions,
one using %tick and one using %stick, and patch the symbols in the
dynamic symbol table.
Fixes: 2f6c9bf31a ("sparc: Improve VDSO instruction patching.")
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
99 lines
2.2 KiB
ArmAsm
99 lines
2.2 KiB
ArmAsm
/*
|
|
* Linker script for vDSO. This is an ELF shared object prelinked to
|
|
* its virtual address, and with only one read-only segment.
|
|
* This script controls its layout.
|
|
*/
|
|
|
|
#if defined(BUILD_VDSO64)
|
|
# define SHDR_SIZE 64
|
|
#elif defined(BUILD_VDSO32)
|
|
# define SHDR_SIZE 40
|
|
#else
|
|
# error unknown VDSO target
|
|
#endif
|
|
|
|
#define NUM_FAKE_SHDRS 7
|
|
|
|
SECTIONS
|
|
{
|
|
/*
|
|
* User/kernel shared data is before the vDSO. This may be a little
|
|
* uglier than putting it after the vDSO, but it avoids issues with
|
|
* non-allocatable things that dangle past the end of the PT_LOAD
|
|
* segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries
|
|
*/
|
|
|
|
vvar_start = . -8192;
|
|
vvar_data = vvar_start;
|
|
|
|
. = SIZEOF_HEADERS;
|
|
|
|
.hash : { *(.hash) } :text
|
|
.gnu.hash : { *(.gnu.hash) }
|
|
.dynsym : { *(.dynsym) }
|
|
.dynstr : { *(.dynstr) }
|
|
.gnu.version : { *(.gnu.version) }
|
|
.gnu.version_d : { *(.gnu.version_d) }
|
|
.gnu.version_r : { *(.gnu.version_r) }
|
|
|
|
.dynamic : { *(.dynamic) } :text :dynamic
|
|
|
|
.rodata : {
|
|
*(.rodata*)
|
|
*(.data*)
|
|
*(.sdata*)
|
|
*(.got.plt) *(.got)
|
|
*(.gnu.linkonce.d.*)
|
|
*(.bss*)
|
|
*(.dynbss*)
|
|
*(.gnu.linkonce.b.*)
|
|
|
|
/*
|
|
* Ideally this would live in a C file: kept in here for
|
|
* compatibility with x86-64.
|
|
*/
|
|
VDSO_FAKE_SECTION_TABLE_START = .;
|
|
. = . + NUM_FAKE_SHDRS * SHDR_SIZE;
|
|
VDSO_FAKE_SECTION_TABLE_END = .;
|
|
} :text
|
|
|
|
.fake_shstrtab : { *(.fake_shstrtab) } :text
|
|
|
|
|
|
.note : { *(.note.*) } :text :note
|
|
|
|
.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
|
|
.eh_frame : { KEEP (*(.eh_frame)) } :text
|
|
|
|
|
|
/*
|
|
* Text is well-separated from actual data: there's plenty of
|
|
* stuff that isn't used at runtime in between.
|
|
*/
|
|
|
|
.text : { *(.text*) } :text =0x90909090,
|
|
|
|
/DISCARD/ : {
|
|
*(.discard)
|
|
*(.discard.*)
|
|
*(__bug_table)
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Very old versions of ld do not recognize this name token; use the constant.
|
|
*/
|
|
#define PT_GNU_EH_FRAME 0x6474e550
|
|
|
|
/*
|
|
* We must supply the ELF program headers explicitly to get just one
|
|
* PT_LOAD segment, and set the flags explicitly to make segments read-only.
|
|
*/
|
|
PHDRS
|
|
{
|
|
text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
|
|
dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
|
|
note PT_NOTE FLAGS(4); /* PF_R */
|
|
eh_frame_hdr PT_GNU_EH_FRAME;
|
|
}
|