2d1b202762
To allow for a single kernel image on e500 v1/v2/mc we need to fixup lwsync at runtime. On e500v1/v2 lwsync causes an illop so we need to patch up the code. We default to 'sync' since that is always safe and if the cpu is capable we will replace 'sync' with 'lwsync'. We introduce CPU_FTR_LWSYNC as a way to determine at runtime if this is needed. This flag could be moved elsewhere since we dont really use it for the normal CPU_FTR purpose. Finally we only store the relative offset in the fixup section to keep it as small as possible rather than using a full fixup_entry. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
149 lines
3.6 KiB
ArmAsm
149 lines
3.6 KiB
ArmAsm
/*
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* This is the infamous ld script for the 64 bits vdso
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* library
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*/
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#include <asm/vdso.h>
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OUTPUT_FORMAT("elf64-powerpc", "elf64-powerpc", "elf64-powerpc")
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OUTPUT_ARCH(powerpc:common64)
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ENTRY(_start)
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SECTIONS
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{
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. = VDSO64_LBASE + SIZEOF_HEADERS;
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.hash : { *(.hash) } :text
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.gnu.hash : { *(.gnu.hash) }
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.dynsym : { *(.dynsym) }
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.dynstr : { *(.dynstr) }
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.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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.gnu.version_r : { *(.gnu.version_r) }
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.note : { *(.note.*) } :text :note
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. = ALIGN(16);
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.text : {
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*(.text .stub .text.* .gnu.linkonce.t.* __ftr_alt_*)
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*(.sfpr .glink)
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} :text
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PROVIDE(__etext = .);
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PROVIDE(_etext = .);
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PROVIDE(etext = .);
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. = ALIGN(8);
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__ftr_fixup : { *(__ftr_fixup) }
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. = ALIGN(8);
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__lwsync_fixup : { *(__lwsync_fixup) }
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. = ALIGN(8);
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__fw_ftr_fixup : { *(__fw_ftr_fixup) }
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/*
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* Other stuff is appended to the text segment:
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*/
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.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
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.rodata1 : { *(.rodata1) }
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.dynamic : { *(.dynamic) } :text :dynamic
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.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
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.eh_frame : { KEEP (*(.eh_frame)) } :text
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.gcc_except_table : { *(.gcc_except_table) }
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.rela.dyn ALIGN(8) : { *(.rela.dyn) }
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.opd ALIGN(8) : { KEEP (*(.opd)) }
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.got ALIGN(8) : { *(.got .toc) }
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_end = .;
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PROVIDE(end = .);
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/*
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* Stabs debugging sections are here too.
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*/
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/*
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* DWARF debug sections.
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* Symbols in the DWARF debugging sections are relative to the beginning
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* of the section so we begin them at 0.
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*/
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/DISCARD/ : {
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*(.note.GNU-stack)
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*(.branch_lt)
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*(.data .data.* .gnu.linkonce.d.* .sdata*)
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*(.bss .sbss .dynbss .dynsbss)
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}
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}
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/*
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* Very old versions of ld do not recognize this name token; use the constant.
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*/
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#define PT_GNU_EH_FRAME 0x6474e550
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/*
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* We must supply the ELF program headers explicitly to get just one
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* PT_LOAD segment, and set the flags explicitly to make segments read-only.
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*/
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PHDRS
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{
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text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
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dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
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note PT_NOTE FLAGS(4); /* PF_R */
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eh_frame_hdr PT_GNU_EH_FRAME;
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}
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/*
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* This controls what symbols we export from the DSO.
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*/
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VERSION
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{
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VDSO_VERSION_STRING {
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global:
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/*
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* Has to be there for the kernel to find
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*/
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__kernel_datapage_offset;
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__kernel_get_syscall_map;
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__kernel_gettimeofday;
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__kernel_clock_gettime;
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__kernel_clock_getres;
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__kernel_get_tbfreq;
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__kernel_sync_dicache;
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__kernel_sync_dicache_p5;
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__kernel_sigtramp_rt64;
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local: *;
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};
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}
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