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Update.
1998-04-1 16:52 Philip Blundell <pb@nexus.co.uk> * sysdeps/unix/sysv/linux/arm/socket.S: Correct test for error and use PLTJMP() rather than explicit (PLT). * sysdeps/arm/elf/start.S: Leave most of the initialisation for __libc_start_main(). Based on patch from Pat Beirne: * sysdeps/unix/sysv/linux/arm/sysdep.h (SYSCALL_ERROR_HANDLER): Always define, not only #ifndef PIC. (DO_CALL): Pass fifth argument correctly in R4. (PSEUDO): Correct test for error, call syscall_error through PLT if PIC. 1998-03-31 10:51 Philip Blundell <pb@nexus.co.uk> * sysdeps/unix/sysv/linux/netash/ash.h: Fix typos and add new definitions.
This commit is contained in:
Ulrich Drepper
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ChangeLog
20
ChangeLog
@ -1,3 +1,23 @@
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1998-04-1 16:52 Philip Blundell <pb@nexus.co.uk>
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* sysdeps/unix/sysv/linux/arm/socket.S: Correct test for error and
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use PLTJMP() rather than explicit (PLT).
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* sysdeps/arm/elf/start.S: Leave most of the initialisation for
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__libc_start_main().
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Based on patch from Pat Beirne:
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* sysdeps/unix/sysv/linux/arm/sysdep.h (SYSCALL_ERROR_HANDLER):
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Always define, not only #ifndef PIC.
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(DO_CALL): Pass fifth argument correctly in R4.
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(PSEUDO): Correct test for error, call syscall_error through PLT
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if PIC.
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1998-03-31 10:51 Philip Blundell <pb@nexus.co.uk>
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* sysdeps/unix/sysv/linux/netash/ash.h: Fix typos and add new
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definitions.
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1998-04-01 Ulrich Drepper <drepper@cygnus.com>
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* iconvdata/Makefile: Remove extra dependencies for EUC-KR.so and
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@ -24,19 +24,19 @@
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This includes _init and _libc_init
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At this entry point, most registers' values are unspecified, except for:
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At this entry point, most registers' values are unspecified, except:
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r0 Contains a function pointer to be registered with `atexit'.
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a1 Contains a function pointer to be registered with `atexit'.
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This is how the dynamic linker arranges to have DT_FINI
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functions called for shared libraries that have been loaded
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before this code runs.
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sp The stack contains the arguments and environment:
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0(%esp) argc
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4(%esp) argv[0]
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0(sp) argc
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4(sp) argv[0]
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...
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(4*argc)(%esp) NULL
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(4*(argc+1))(%esp) envp[0]
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(4*argc)(sp) NULL
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(4*(argc+1))(sp) envp[0]
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...
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NULL
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*/
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@ -44,62 +44,29 @@
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.text
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.globl _start
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_start:
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/* Clear the frame pointer. The Intel ABI suggests this be done,
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to mark the outermost frame obviously. This seems like a
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sensible thing to do */
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/* Clear the frame pointer since this is the outermost frame. */
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mov fp, #0
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/* r0 contains the address of the shared library termination
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function, which we will register with `atexit' to be called by
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`exit'. I suspect that on some systems, and when statically
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linked, this will not be set by anything to any function
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pointer; hopefully it will be zero so we don't try to call
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random pointers. */
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cmp r0,#0
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blne atexit(PLT)
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/* Pop argc off the stack and save a pointer to argv */
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ldmfd sp!, {a2}
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mov a3, sp
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/* Do essential libc initialization. In statically linked
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programs under the GNU Hurd, this is what sets up the
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arguments on the stack for the code below. For dyn-link
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programs, this has been run already, in the .init code. */
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#ifndef PIC
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bl __libc_init_first
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/* Push the last arguments to main() onto the stack */
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stmfd sp!, {a1}
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ldr a1, =_fini
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stmfd sp!, {a1}
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/* Extract the arguments and environment as encoded on the stack
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and set up the arguments for `main': argc, argv, envp. */
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ldr r0,[sp]
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add r1,sp,#4
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add r2,r1,r0,lsl #2
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add r2,r2,#4
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/* save a copy of envp while we have it */
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ldr r3,L_environ
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str r2,[r3]
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/* Set up the other arguments for main() that go in registers */
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ldr a1, =main
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ldr a4, =_init
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/* Call `_init', which is the entry point to our own `.init'
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section; and register with `atexit' to have `exit' call
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`_fini', which is the entry point to our own `.fini' section. */
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bl _init
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ldr r0,L_fini
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bl atexit
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b L_pfini
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/* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */
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L_fini: .word _fini
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L_environ: .word _environ
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L_pfini:
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#endif
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/* rebuild the arg list for main() */
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ldr r0,[sp]
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add r1,sp,#4
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add r2,r1,r0,lsl #2
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add r2,r2,#4
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/* Call the user's main function, and exit with its value. */
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bl main
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bl exit
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/* Let the libc call main and exit with its return code. */
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bl __libc_start_main
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/* should never get here....*/
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bl abort
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/* Define a symbol for the first piece of initialized data. */
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.data
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.globl __data_start
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@ -43,7 +43,7 @@ ENTRY (__socket)
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/* r0 is < 0 if there was an error. */
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cmn r0, $124
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bge syscall_error(PLT)
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bhs PLTJMP(syscall_error)
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/* Successful; return the syscall's value. */
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RETINSTR(mov,pc,r14)
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@ -45,28 +45,64 @@
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is a real error number. Linus said he will make sure the no syscall
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returns a value in -1 .. -4095 as a valid result so we can savely
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test with -4095. */
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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.text; \
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.type syscall_error,%function \
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ENTRY (name) \
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DO_CALL (args, syscall_name); \
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cmn r0, $4096; \
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bgt syscall_error;
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bhs PLTJMP(syscall_error);
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER \
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END (name)
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#ifndef PIC
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#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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#else
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#error Aiee
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#endif /* PIC */
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/* Linux takes system call args in registers:
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syscall number in the SWI instruction
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arg 1 r0
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arg 2 r1
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arg 3 r2
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arg 4 r3
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arg 5 r4 (this is different from the APCS convention)
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The compiler is going to form a call by coming here, through PSEUDO, with
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arguments
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syscall number in the DO_CALL macro
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arg 1 r0
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arg 2 r1
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arg 3 r2
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arg 4 r3
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arg 5 [sp]
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We need to shuffle values between R4 and the stack so that the caller's
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R4 is not corrupted, and the kernel sees the right argument there.
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*/
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#undef DO_CALL
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#define DO_CALL(args, syscall_name) \
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swi SYS_ify (syscall_name);
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#define DO_CALL(args, syscall_name) \
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DOARGS_##args \
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swi SYS_ify (syscall_name); \
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UNDOARGS_##args
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#define DOARGS_0 /* nothing */
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#define DOARGS_1 /* nothing */
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#define DOARGS_2 /* nothing */
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#define DOARGS_3 /* nothing */
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#define DOARGS_4 /* nothing */
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#define DOARGS_5 ldr ip, [sp]; str r4, [sp]; mov r4, ip;
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#define UNDOARGS_0 /* nothing */
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#define UNDOARGS_1 /* nothing */
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#define UNDOARGS_2 /* nothing */
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#define UNDOARGS_3 /* nothing */
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#define UNDOARGS_4 /* nothing */
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#define UNDOARGS_5 ldr r4, [sp];
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#endif /* ASSEMBLER */
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@ -17,18 +17,24 @@
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef __NETASH_ASH_H
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#define __NETASH_ASH_H 1
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#ifndef _NETASH_ASH_H
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#define _NETASH_ASH_H 1
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#include <features.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <bits/sockaddr.h>
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struct sockaddr_ash
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{
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_SOCKADDR_COMMON (sash_); /* Common data: address family etc. */
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int if_index; /* Interface to use. */
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int channel; /* Realtime or control. */
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__SOCKADDR_COMMON (sash_); /* Common data: address family etc. */
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int sash_ifindex; /* Interface to use. */
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unsigned char sash_channel; /* Realtime or control. */
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unsigned int sash_plen;
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unsigned char sash_prefix[16];
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};
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/* Values for `channel' member. */
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#define ASH_CHANNEL_ANY 0
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#define ASH_CHANNEL_CONTROL 1
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#define ASH_CHANNEL_REALTIME 2
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#endif /* netash/ash.h */
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