diff options
Diffstat (limited to 'sysdeps/mach')
| -rw-r--r-- | sysdeps/mach/hurd/dl-sysdep.c | 15 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/i386/init-first.c | 71 |
2 files changed, 68 insertions, 18 deletions
diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c index 1dca319433..d4845213f4 100644 --- a/sysdeps/mach/hurd/dl-sysdep.c +++ b/sysdeps/mach/hurd/dl-sysdep.c @@ -36,6 +36,8 @@ Cambridge, MA 02139, USA. */ #include "dl-machine.h" +extern void __mach_init (void); + extern int _dl_argc; extern char **_dl_argv; extern char **_environ; @@ -52,8 +54,8 @@ _dl_sysdep_start (void **start_argptr, char **p; /* Cache the information in various global variables. */ - _dl_argc = *argdata++; - _dl_argv = (void *) argdata; + _dl_argc = *argdata; + _dl_argv = (void *) &argdata[1]; _environ = &_dl_argv[_dl_argc + 1]; for (p = _environ; *p; ++p); _dl_hurd_data = (void *) ++p; @@ -66,6 +68,12 @@ _dl_sysdep_start (void **start_argptr, _dl_hurd_data->phdrsz / sizeof (Elf32_Phdr), &_dl_hurd_data->user_entry); + /* Deallocate the reply port and task port rights acquired by + __mach_init. We are done with them now, and the user will + reacquire them for himself when he wants them. */ + __mig_dealloc_reply_port (MACH_PORT_NULL); + __mach_port_deallocate (__mach_task_self (), __mach_task_self_); + { extern void _dl_start_user (void); /* Unwind the stack to ARGDATA and simulate a return from _dl_start @@ -74,6 +82,9 @@ _dl_sysdep_start (void **start_argptr, } } + /* Set up so we can do RPCs. */ + __mach_init (); + /* See hurd/hurdstartup.c; this deals with getting information from the exec server and slicing up the arguments. Then it will call `go', above. */ diff --git a/sysdeps/mach/hurd/i386/init-first.c b/sysdeps/mach/hurd/i386/init-first.c index d747e75c7d..74b15c8f2f 100644 --- a/sysdeps/mach/hurd/i386/init-first.c +++ b/sysdeps/mach/hurd/i386/init-first.c @@ -95,8 +95,8 @@ init1 (int argc, char *arg0, ...) __libc_init (argc, argv, __environ); } -static void -init (int *data, int retaddr) +static void +init (int *data, void *usercode, void **retaddrloc) { int argc = *data; char **argv = (void *) (data + 1); @@ -115,6 +115,11 @@ init (int *data, int retaddr) if (__hurd_threadvar_max < _HURD_THREADVAR_MAX) __hurd_threadvar_max = _HURD_THREADVAR_MAX; + + /* After possibly switching stacks, call `init1' (above) with the user + code as the return address, and the argument data immediately above + that on the stack. */ + if (_cthread_init_routine) { /* Initialize cthreads, which will allocate us a new stack to run on. */ @@ -136,13 +141,45 @@ init (int *data, int retaddr) /* Copy the Hurd startup data block to the new stack. */ *od = *d; - data = newsp; + /* Push the user code address on the top of the new stack. It will + be the return address for `init1'; we will jump there with NEWSP + as the stack pointer. */ + *--(void **) newsp = usercode; + /* Mutate our own return address to run the code below. */ + *retaddrloc = &&switch_stacks; + /* Force NEWSP into %ecx and &init1 into %eax, which are not restored + by function return. */ + asm volatile ("# a %0 c %1" : : "a" (&init1), "c" (newsp)); + return; + switch_stacks: + /* Our return address was redirected to here, so at this point our + stack is unwound and callers' registers restored. Only %ecx and + %eax are call-clobbered and thus still have the values we set just + above. Fetch from there the new stack pointer we will run on, and + jmp to the run-time address of `init1'; when it returns, it will + run the user code with the argument data at the top of the stack. */ + asm volatile ("movl %ecx, %esp; jmp *%eax"); + /* NOTREACHED */ + } + else + { + /* We are not switching stacks, but we must play some games with + the one we've got, similar to the stack-switching code above. */ + *retaddrloc = &&call_init1; + /* Force the user code address into %ecx and the run-time address of + `init1' into %eax, for use below. */ + asm volatile ("# a %0 c %1" : : "a" (&init1), "c" (usercode)); + return; + call_init1: + /* As in the stack-switching case, at this point our stack is unwound + and callers' registers restored, and only %ecx and %eax + communicate values from the lines above. In this case we have + stashed in %ecx the user code return address. Push it on the top + of the stack so it acts as init1's return address, and then jump + there. */ + asm volatile ("pushl %ecx; jmp *%eax"); + /* NOTREACHED */ } - - /* Call `init1' (above) with the user code as the return address, - and the argument data immediately above that on the stack. */ - *--data = retaddr; - asm volatile ("movl %0, %%esp; jmp %*%1" : : "g" (data), "r" (&init1)); } @@ -151,30 +188,32 @@ init (int *data, int retaddr) It is called just before the user _start code from i386/elf/start.S, with the stack set up as that code gets it. */ -static void soinit (int argc, ...) __attribute__ ((unused, section (".init"))); +/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT + pointer in the dynamic section based solely on that. It is convention + for this function to be in the `.init' section, but the symbol name is + the only thing that really matters!! */ +/*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/ -static void -soinit (int argc, ...) +void +_init (int argc, ...) { /* Initialize data structures so we can do RPCs. */ __mach_init (); RUN_HOOK (_hurd_preinit_hook, ()); - init (&argc, (&argc)[-1]); - - (void) &soinit; /* Avoid gcc optimizing this fn out. */ + init (&argc, ((void **) &argc)[-1], &((void **) &argc)[-1]); } #endif void -__libc_init_first (int argc, ...) +__libc_init_first (int argc __attribute__ ((unused)), ...) { #ifndef PIC void doinit (int *data) { - init (data, (&argc)[-1]); + init (data, ((void **) &argc)[-1], &((void **) &data)[-1]); } /* Initialize data structures so we can do RPCs. */ |