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Diffstat (limited to 'sysdeps/s390/s390-32/start.S')
| -rw-r--r-- | sysdeps/s390/s390-32/start.S | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/sysdeps/s390/s390-32/start.S b/sysdeps/s390/s390-32/start.S deleted file mode 100644 index 07400f1752..0000000000 --- a/sysdeps/s390/s390-32/start.S +++ /dev/null @@ -1,211 +0,0 @@ -/* Startup code compliant to the ELF s390 ABI. - Copyright (C) 2000-2017 Free Software Foundation, Inc. - Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). - 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. - - In addition to the permissions in the GNU Lesser General Public - License, the Free Software Foundation gives you unlimited - permission to link the compiled version of this file with other - programs, and to distribute those programs without any restriction - coming from the use of this file. (The GNU Lesser General Public - License restrictions do apply in other respects; for example, they - cover modification of the file, and distribution when not linked - into another program.) - - Note that people who make modified versions of this file are not - obligated to grant this special exception for their modified - versions; it is their choice whether to do so. The GNU Lesser - General Public License gives permission to release a modified - version without this exception; this exception also makes it - possible to release a modified version which carries forward this - exception. - - 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/>. */ - -/* - This is the canonical entry point, usually the first thing in the text - segment. Most registers' values are unspecified, except for: - - %r14 Contains a function pointer to be registered with `atexit'. - This is how the dynamic linker arranges to have DT_FINI - functions called for shared libraries that have been loaded - before this code runs. - - %r15 The stack contains the arguments and environment: - 0(%r15) argc - 4(%r15) argv[0] - ... - (4*argc)(%r15) NULL - (4*(argc+1))(%r15) envp[0] - ... - NULL -*/ - - .text - .globl _start - .type _start,@function -_start: - /* Check if the kernel provides highgprs facility if needed by - the binary. */ - - lr %r6,%r15 - la %r6,4(%r6) /* Skip the argument counter. */ - -.L11: l %r5,0(%r6) /* Skip the argument vector. */ - la %r6,4(%r6) - ltr %r5,%r5 - jne .L11 - -.L12: l %r5,0(%r6) /* Skip the environment vector. */ - la %r6,4(%r6) - ltr %r5,%r5 - jne .L12 - - /* Usually the auxiliary vector can be expected directly after - the environment variables. But we have to skip extra zeros - because the loader might have removed unsecure variables for - setuid programs. */ - -.L26: l %r5,0(%r6) - la %r6,4(%r6) - ltr %r5,%r5 - jz .L26 - - ahi %r6,-4 - - /* Obtain the needed values from the auxiliary vector. */ - - lhi %r7,16 /* AT_HWCAP */ - lhi %r8,3 /* AT_PHDR */ - lhi %r9,5 /* AT_PHNUM */ - lhi %r2,4 /* AT_PHENT */ -.L13: l %r5,0(%r6) - clr %r5,%r7 - jne .L15 - l %r10,4(%r6) /* r10 = AT_HWCAP value. */ -.L15: clr %r5,%r8 - jne .L16 - l %r11,4(%r6) /* r11 = AT_PHDR value. */ -.L16: clr %r5,%r9 - jne .L17 - l %r12,4(%r6) /* r12 = AT_PHNUM value. */ -.L17: clr %r5,%r2 - jne .L18 - l %r0,4(%r6) /* r0 = AT_PHENT value. */ -.L18: ltr %r5,%r5 - la %r6,8(%r6) - jnz .L13 - - /* Locate the ELF header by looking for the first PT_LOAD - segment with a p_offset of zero. */ - - lr %r4,%r11 /* Backup AT_PHDR. */ - lhi %r7,1 /* PT_LOAD id */ - lhi %r8,0 -.L19: cl %r7,0(%r4) /* p_type == PT_LOAD? */ - jne .L20 - cl %r8,4(%r4) /* p_offset == 0? */ - jne .L20 - l %r9,8(%r4) /* r9 = PT_LOAD.p_vaddr <- ELF header address */ - j .L24 -.L20: alr %r4,%r0 /* r4 += AT_PHENT value */ - brct %r12,.L19 - - j .+2 /* Trap, there must be such a phdr. */ - -.L24: lr %r4,%r11 /* Backup AT_PHDR. */ - lhi %r2,6 /* PT_PHDR id */ -.L23: cl %r2,0(%r4) - jne .L22 - l %r3,8(%r4) /* r3 = PT_PHDR p_vaddr */ - j .L25 -.L22: alr %r4,%r0 /* r4 += AT_PHENT value */ - brct %r12,.L23 - - j .L14 /* No PT_PHDR found - skip checking. */ - -.L25: slr %r11,%r3 /* AT_PHDR - PT_PHDR.p_vaddr (relocation offset)*/ - alr %r9,%r11 /* PT_LOAD.p_vaddr += relocation offset */ - - l %r5,36(%r9) /* Load the e_flags field. */ - tml %r5,1 - jz .L14 /* Binary does not require highgprs facility. */ - - tml %r10,512 /* Check the AT_HWCAP value. */ - jz 2 /* Trap if no highgprs facility available. */ -.L14: - - /* Setup pointer to literal pool of _start */ - basr %r13,0 -.L0: ahi %r13,.Llit-.L0 - - /* load argc and argv from stack */ - la %r4,4(%r15) # get argv - l %r3,0(%r15) # get argc - - /* align the stack to a double word boundary */ - lhi %r0,-8 - nr %r15,%r0 - - /* Setup a stack frame and a parameter area */ - ahi %r15,-104 # make room on stack - xc 0(4,%r15),0(%r15) # clear back-chain - - /* set up arguments for __libc_start_main: - main, argc, argv, envp, _init, _fini, rtld_fini, stack_end - Note that envp will be determined later in __libc_start_main - */ - stm %r14,%r15,96(%r15) # store rtld_fini/stack_end to parameter area - la %r7,96(%r15) - l %r6,.L2-.Llit(%r13) # load pointer to __libc_csu_fini - l %r5,.L1-.Llit(%r13) # load pointer to __libc_csu_init - l %r2,.L3-.Llit(%r13) # load pointer to main - l %r1,.L4-.Llit(%r13) # load pointer to __libc_start_main -#ifdef PIC - l %r12,.L5-.Llit(%r13) # load .got pointer - la %r6,0(%r13,%r6) - la %r5,0(%r13,%r5) - la %r12,0(%r13,%r12) - l %r2,0(%r12,%r2) - la %r1,0(%r13,%r1) -#endif - - /* ok, now branch to the libc main routine */ - basr %r14,%r1 - - /* crash if __libc_start_main returns */ - .word 0 - -.Llit: -#ifndef PIC -.L1: .long __libc_csu_init -.L2: .long __libc_csu_fini -.L3: .long main -.L4: .long __libc_start_main -#else -.L1: .long __libc_csu_init-.Llit -.L2: .long __libc_csu_fini-.Llit -.L3: .long main@GOT -.L4: .long __libc_start_main@plt-.Llit -.L5: .long _GLOBAL_OFFSET_TABLE_-.Llit -#endif - -/* Define a symbol for the first piece of initialized data. */ - .data - .globl __data_start -__data_start: - .long 0 - .weak data_start - data_start = __data_start |