diff options
Diffstat (limited to 'libc/arch-arm/bionic/crtbegin_static.S')
| -rw-r--r-- | libc/arch-arm/bionic/crtbegin_static.S | 33 |
1 files changed, 21 insertions, 12 deletions
diff --git a/libc/arch-arm/bionic/crtbegin_static.S b/libc/arch-arm/bionic/crtbegin_static.S index e265923..69d8df6 100644 --- a/libc/arch-arm/bionic/crtbegin_static.S +++ b/libc/arch-arm/bionic/crtbegin_static.S @@ -30,25 +30,27 @@ .type _start,#function .globl _start -# this is the small startup code that is first run when -# any executable that is statically-linked with Bionic -# runs. +# This is the small startup code that is first run when +# any static executable runs. A static executable is one +# that is started directly by the Linux kernel, not from +# the dynamic linker, it thus cannot depend on any shared +# library. # -# it's purpose is to call __libc_init with appropriate +# It's purpose is to call __libc_init as defined in +# bionic/libc_init_static.c with appropriate # arguments, which are: # # - the address of the raw data block setup by the Linux # kernel ELF loader # -# - address of an "onexit" function, not used on any -# platform supported by Bionic +# - address of an "onexit" function (not used on any +# platform supported by Bionic). # -# - address of the "main" function of the program. We -# can't hard-code it in the adr pseudo instruction -# so we use a tiny trampoline that will get relocated -# by the dynamic linker before this code runs +# - address of the "main" function of the program. # -# - address of the constructor list +# - address of the constructors table, i.e. a table +# that points to various initialization and +# finalization sections for the program. # _start: mov r0, sp @@ -59,11 +61,18 @@ _start: 0: b main +# The "C++ ABI for ARM" document that static C++ constructors +# shall only be called from the .init_array section. +# +# Do we really need a .ctors section on ARM platforms ? +# It looks like it will always be empty. +# + 1: .long __PREINIT_ARRAY__ .long __INIT_ARRAY__ .long __FINI_ARRAY__ .long __CTOR_LIST__ - + # the .ctors section contains a list of pointers to "constructor" # functions that need to be called in order during C library initialization, # just before the program is being run. This is a C++ requirement |