[Xen-devel] PVOPS: missing some xen symbols in vmlinux

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

Hi Jeremy,

I noticed in PVOPS kernels that lot of the xen functions in arch/x86/xen
are not properly symbolized in vmlinux. 

These symbols show up just fine in arch/x86/built-in.o, but seem to be 
getting dropped along the way, it appears in the following step:

  ld -m elf_x86_64 --build-id  -o .tmp_vmlinux1 -T arch/x86/kernel/vmlinux.lds 
arch/x86/kernel/head_64.o arch/x86/kernel/head64.o arch/x86/kernel/head.o 
arch/x86/kernel/init_task.o  init/built-in.o --start-group  usr/built-in.o  
arch/x86/built-in.o  kernel/built-in.o  mm/built-in.o  fs/built-in.o  
ipc/built-in.o  security/built-in.o  crypto/built-in.o  block/built-in.o  
lib/lib.a  arch/x86/lib/lib.a  lib/built-in.o  arch/x86/lib/built-in.o  
drivers/built-in.o  sound/built-in.o  firmware/built-in.o  
arch/x86/pci/built-in.o  arch/x86/power/built-in.o  arch/x86/video/built-in.o  
net/built-in.o --end-group

[mantra]../linux-2.6.39-mine/obj> nm .tmp_vmlinux1|grep xen_start_k
ffffffff818c5b42 T xen_start_kernel

bash> gdb .tmp_vmlinux1
(gdb) disass xen_start_kernel
No function contains specified address.
(gdb) disass 0xffffffff818c5b42
No function contains specified address.
(gdb) disass native_read_cr4_safe
Dump of assembler code for function native_read_cr4_safe:
0xffffffff8100300e <native_read_cr4_safe+0>:    push   %rbp
0xffffffff8100300f <native_read_cr4_safe+1>:    mov    %rsp,%rbp
...
(gdb) disass xen_write_cr3
Dump of assembler code for function __brk_reservation_fn_level1_ident_pgt__:
End of assembler dump.
(gdb) disass arch_pick_mmap_layout
Dump of assembler code for function arch_pick_mmap_layout:
0xffffffff81039bcb <arch_pick_mmap_layout+0>:   push   %rbp
0xffffffff81039bcc <arch_pick_mmap_layout+1>:   mov    %rsp,%rbp
(gdb) disass raw_pci_read
Dump of assembler code for function raw_pci_read:
0xffffffff813f82ac <raw_pci_read+0>:    push   %rbp
0xffffffff813f82ad <raw_pci_read+1>:    mov    %rsp,%rbp
...
(gdb) disass make_lowmem_page_readonly
Dump of assembler code for function __brk_reservation_fn_level1_ident_pgt__:
End of assembler dump.

bash> gdb vmlinux
(gdb) disass make_lowmem_page_readonly
Dump of assembler code for function __brk_reservation_fn_level1_ident_pgt__:
End of assembler dump.


I am trying to figure out what is it about those xen functions, any
thoughts?

thanks,
Mukesh


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