|
@@ -1,230 +0,0 @@
|
|
|
-/* This is the canonical entry point, usually the first thing in the text
|
|
|
- segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry
|
|
|
- point runs, most registers' values are unspecified, except for:
|
|
|
-
|
|
|
- %rdx 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.
|
|
|
-
|
|
|
- %rsp The stack contains the arguments and environment:
|
|
|
- 0(%rsp) argc
|
|
|
- 8(%rsp) argv[0]
|
|
|
- ...
|
|
|
- (8*argc)(%rsp) NULL
|
|
|
- (8*(argc+1))(%rsp) envp[0]
|
|
|
- ...
|
|
|
- NULL
|
|
|
-*/
|
|
|
-
|
|
|
- .text
|
|
|
- .globl _start
|
|
|
- .type _start,@function
|
|
|
-_start:
|
|
|
- /* Clear the frame pointer. The ABI suggests this be done, to mark
|
|
|
- the outermost frame obviously. */
|
|
|
- xorq %rbp, %rbp
|
|
|
-
|
|
|
- /* Extract the arguments as encoded on the stack and set up
|
|
|
- the arguments for __libc_start_main (int (*main) (int, char **, char **),
|
|
|
- int argc, char *argv,
|
|
|
- void (*init) (void), void (*fini) (void),
|
|
|
- void (*rtld_fini) (void), void *stack_end).
|
|
|
- The arguments are passed via registers and on the stack:
|
|
|
- main: %rdi
|
|
|
- argc: %rsi
|
|
|
- argv: %rdx
|
|
|
- init: %rcx
|
|
|
- fini: %r8
|
|
|
- rtld_fini: %r9
|
|
|
- stack_end: stack. */
|
|
|
-
|
|
|
- movq %rdx, %r9 /* Address of the shared library termination
|
|
|
- function. */
|
|
|
- popq %rsi /* Pop the argument count. */
|
|
|
- movq %rsp, %rdx /* argv starts just at the current stack top. */
|
|
|
-
|
|
|
- movq entryinfo@GOTPCREL(%rip),%r10 /* load address of entryinfo variable */
|
|
|
-
|
|
|
- movq %rsi,56(%r10)
|
|
|
- movq %rsp,64(%r10) /* argv starts just at the current stack top */
|
|
|
- leaq 8(,%rsi,8),%rax
|
|
|
- addq %rsp,%rax
|
|
|
- movq %rax,72(%r10)
|
|
|
-
|
|
|
- /* Align the stack to a 16 byte boundary to follow the ABI. */
|
|
|
- andq $~15, %rsp
|
|
|
-
|
|
|
- pushq %rax /* Push garbage because we push 8 more bytes. */
|
|
|
-
|
|
|
- /* Provide the highest stack address to the user code (for stacks
|
|
|
- which grow downwards). */
|
|
|
- pushq %rsp
|
|
|
-
|
|
|
- /* Pass address of our own entry points to .fini and .init. */
|
|
|
- movq _init_dummy@GOTPCREL(%rip), %r8
|
|
|
- movq _fini_dummy@GOTPCREL(%rip), %rcx
|
|
|
-
|
|
|
- movq main_stub@GOTPCREL(%rip), %rdi
|
|
|
-
|
|
|
- /* Call the user's main function, and exit with its value.
|
|
|
- But let the libc call main. */
|
|
|
- call __libc_start_main@PLT
|
|
|
-
|
|
|
- hlt /* Crash if somehow `exit' does return. */
|
|
|
-
|
|
|
-/* fake main routine which will be run from libc */
|
|
|
- .globl main_stub
|
|
|
- .type main_stub,@function
|
|
|
-main_stub:
|
|
|
- /* save return address */
|
|
|
- popq %rax
|
|
|
-
|
|
|
- // stack alignment
|
|
|
- pushq %rax
|
|
|
-
|
|
|
- movq ___fpc_ret_rbp@GOTPCREL(%rip),%rcx
|
|
|
- movq %rbp,(%rcx)
|
|
|
- movq ___fpc_ret@GOTPCREL(%rip),%rcx
|
|
|
- movq %rax,(%rcx)
|
|
|
- pushq %rax
|
|
|
-
|
|
|
- /* Initialize gmon */
|
|
|
- movq _etext@GOTPCREL(%rip),%rsi
|
|
|
- movq _start@GOTPCREL(%rip),%rdi
|
|
|
- call monstartup@PLT
|
|
|
-
|
|
|
- movq _mcleanup@GOTPCREL(%rip),%rdi
|
|
|
- call atexit@PLT
|
|
|
-
|
|
|
- /* fill the remaining fields of the entry information */
|
|
|
- movq entryinfo@GOTPCREL(%rip),%rdi /* load address of entryinfo variable into argument for SysEntry*/
|
|
|
-
|
|
|
- /* Save initial stackpointer */
|
|
|
- movq %rsp,80(%rdi)
|
|
|
-
|
|
|
- /* store stack length */
|
|
|
- movq __stklen@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,88(%rdi)
|
|
|
-
|
|
|
- /* store pointer to _haltproc */
|
|
|
- movq _haltproc@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,96(%rdi)
|
|
|
-
|
|
|
- /* populate the table pointers */
|
|
|
- movq INITFINAL@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,(%rdi)
|
|
|
- movq FPC_THREADVARTABLES@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,8(%rdi)
|
|
|
- movq FPC_RESOURCESTRINGTABLES@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,16(%rdi)
|
|
|
- movq FPC_RESSTRINITTABLES@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,24(%rdi)
|
|
|
- movq FPC_RESLOCATION@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,32(%rdi)
|
|
|
- movq PASCALMAIN@GOTPCREL(%rip),%rax
|
|
|
- movq %rax,40(%rdi)
|
|
|
- /* valgrind_used can stay 0 */
|
|
|
-
|
|
|
- /* start the program */
|
|
|
- xorq %rbp,%rbp
|
|
|
- call FPC_SysEntry@PLT
|
|
|
- hlt
|
|
|
- .size main_stub,.-main_stub
|
|
|
-
|
|
|
- .globl _haltproc
|
|
|
- .type _haltproc,@function
|
|
|
-_haltproc:
|
|
|
- movq operatingsystem_result@GOTPCREL(%rip),%rax
|
|
|
- movzwl (%rax),%eax
|
|
|
-
|
|
|
- /* return to libc */
|
|
|
- movq ___fpc_ret_rbp@GOTPCREL(%rip),%rcx
|
|
|
- movq (%rcx),%rbp
|
|
|
- movq ___fpc_ret@GOTPCREL(%rip),%rcx
|
|
|
- popq %rdx
|
|
|
- movq (%rcx),%rdx
|
|
|
- pushq %rdx
|
|
|
- ret
|
|
|
- .size _haltproc,.-_haltproc
|
|
|
-
|
|
|
- .globl _init_dummy
|
|
|
- .type _init_dummy, @function
|
|
|
-_init_dummy:
|
|
|
- ret
|
|
|
- .size _init_dummy,.-_init_dummy
|
|
|
-
|
|
|
- .globl _fini_dummy
|
|
|
- .type _fini_dummy, @function
|
|
|
-_fini_dummy:
|
|
|
- ret
|
|
|
- .size _fini_dummy,.-_fini_dummy
|
|
|
-
|
|
|
-/* 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
|
|
|
-
|
|
|
- .globl ___fpc_brk_addr /* heap management */
|
|
|
- .type ___fpc_brk_addr,@object
|
|
|
- .size ___fpc_brk_addr,8
|
|
|
-___fpc_brk_addr:
|
|
|
- .quad 0
|
|
|
-
|
|
|
-___fpc_ret: /* return address to libc */
|
|
|
- .quad 0
|
|
|
-___fpc_ret_rbp:
|
|
|
- .quad 0
|
|
|
-
|
|
|
-.bss
|
|
|
-/* the entry information looks like this:
|
|
|
-
|
|
|
- TEntryInformation = record
|
|
|
- InitFinalTable : Pointer; // offset 0
|
|
|
- ThreadvarTablesTable : Pointer; // offset 8
|
|
|
- ResourceStringTables : Pointer; // offset 16
|
|
|
- ResStrInitTables : Pointer; // offset 24
|
|
|
- ResLocation : Pointer; // offset 32
|
|
|
- PascalMain : Procedure; // offset 40
|
|
|
- valgrind_used : boolean; // offset 48
|
|
|
- OS : TEntryInformationOS; // offset 56
|
|
|
- end;
|
|
|
-
|
|
|
- with TEntryInformationOS being
|
|
|
-
|
|
|
- TEntryInformationOS = record
|
|
|
- argc: longint; // offset 56
|
|
|
- argv: ppchar; // offset 64
|
|
|
- envp: ppchar; // offset 72
|
|
|
- stkptr: pointer; // offset 80
|
|
|
- stklen: sizeuint; // offset 88
|
|
|
- haltproc: procedure(e:longint);cdecl; // offset 96
|
|
|
- end;
|
|
|
-
|
|
|
- The size of TEntryInformationOS including padding is 5 * sizeof(Pointer) = 40
|
|
|
-
|
|
|
- The size of TEntryInformation including padding without OS is 8 * sizeof(Pointer) = 64
|
|
|
-
|
|
|
- Thus the total size of TEntryInformation including padding is 104
|
|
|
-
|
|
|
-*/
|
|
|
- .comm entryinfo,104
|
|
|
-
|
|
|
-/* We need this stuff to make gdb behave itself, otherwise
|
|
|
- gdb will chokes with SIGILL when trying to debug apps.
|
|
|
-*/
|
|
|
- .section ".note.ABI-tag", "a"
|
|
|
- .align 4
|
|
|
- .long 1f - 0f
|
|
|
- .long 3f - 2f
|
|
|
- .long 1
|
|
|
-0: .asciz "GNU"
|
|
|
-1: .align 4
|
|
|
-2: .long 0
|
|
|
- .long 2,4,0
|
|
|
-3: .align 4
|
|
|
-
|
|
|
- .section .note.GNU-stack,"",@progbits
|