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Diffstat (limited to 'sysdeps/powerpc/powerpc32/dl-start.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/dl-start.S | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/sysdeps/powerpc/powerpc32/dl-start.S b/sysdeps/powerpc/powerpc32/dl-start.S deleted file mode 100644 index ab429567aa..0000000000 --- a/sysdeps/powerpc/powerpc32/dl-start.S +++ /dev/null @@ -1,103 +0,0 @@ -/* Machine-dependent ELF startup code. PowerPC version. - Copyright (C) 1995-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -/* Initial entry point code for the dynamic linker. - The C function `_dl_start' is the real entry point; - its return value is the user program's entry point. */ -ENTRY(_start) -/* We start with the following on the stack, from top: - argc (4 bytes); - arguments for program (terminated by NULL); - environment variables (terminated by NULL); - arguments for the program loader. */ - -/* Call _dl_start with one parameter pointing at argc */ - mr r3,r1 -/* (we have to frob the stack pointer a bit to allow room for - _dl_start to save the link register). */ - li r4,0 - addi r1,r1,-16 - stw r4,0(r1) - bl _dl_start@local - - /* FALLTHRU */ -_dl_start_user: -/* Now, we do our main work of calling initialisation procedures. - The ELF ABI doesn't say anything about parameters for these, - so we just pass argc, argv, and the environment. - Changing these is strongly discouraged (not least because argc is - passed by value!). */ - -/* Put our GOT pointer in r31, */ - SETUP_GOT_ACCESS(r31,got_label) - addis r31,r31,_GLOBAL_OFFSET_TABLE_-got_label@ha - addi r31,r31,_GLOBAL_OFFSET_TABLE_-got_label@l -/* the address of _start in r30, */ - mr r30,r3 -/* &_dl_argc in 29, &_dl_argv in 27, and _dl_loaded in 28. */ - lwz r28,_rtld_local@got(r31) - lwz r29,_dl_argc@got(r31) - lwz r27,__GI__dl_argv@got(r31) - -/* Call _dl_init (_dl_loaded, _dl_argc, _dl_argv, _dl_argv+_dl_argc+1). */ - lwz r3,0(r28) - lwz r4,0(r29) - lwz r5,0(r27) - slwi r6,r4,2 - add r6,r5,r6 - addi r6,r6,4 - bl _dl_init@local - -/* Now, to conform to the ELF ABI, we have to: */ -/* Pass argc (actually _dl_argc) in r3; */ - lwz r3,0(r29) -/* pass argv (actually _dl_argv) in r4; */ - lwz r4,0(r27) -/* pass envp (actually _dl_argv+_dl_argc+1) in r5; */ - slwi r5,r3,2 - add r6,r4,r5 - addi r5,r6,4 -/* pass the auxiliary vector in r6. This is passed to us just after _envp. */ -2: lwzu r0,4(r6) - cmpwi r0,0 - bne 2b - addi r6,r6,4 -/* Pass a termination function pointer (in this case _dl_fini) in r7. */ - lwz r7,_dl_fini@got(r31) -/* Now, call the start function in r30... */ - mtctr r30 -/* Pass the stack pointer in r1 (so far so good), pointing to a NULL value. - (This lets our startup code distinguish between a program linked statically, - which linux will call with argc on top of the stack which will hopefully - never be zero, and a dynamically linked program which will always have - a NULL on the top of the stack). - Take the opportunity to clear LR, so anyone who accidentally returns - from _start gets SEGV. Also clear the next few words of the stack. */ - -_dl_main_dispatch: - li r31,0 - stw r31,0(r1) - mtlr r31 - stw r31,4(r1) - stw r31,8(r1) - stw r31,12(r1) -/* Go do it! */ - bctr -END(_start) |