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Fix makecontext on s390/s390x
This commit is contained in:
Andreas Schwab
Ulrich Drepper
parent
ef634a94c7
commit
0dabf204ef
@ -1,3 +1,9 @@
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2010-04-13 Andreas Schwab <schwab@redhat.com>
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* sysdeps/unix/sysv/linux/s390/s390-32/makecontext.c: Fix setup of
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overflow area.
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* sysdeps/unix/sysv/linux/s390/s390-64/makecontext.c: Likewise.
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2010-04-12 Andreas Schwab <schwab@redhat.com>
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* stdlib/tst-makecontext3.c (main): Initialize ucontext_t objects
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@ -1,4 +1,4 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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/* Copyright (C) 2001, 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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@ -28,15 +28,15 @@
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double, complex and structure with sizes 0, 2, 4 or 8
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won't work.
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makecontext sets up a stack and the registers for the
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context. The stack looks like this:
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size offset
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user context. The stack looks like this:
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size offset
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%r15 -> +-----------------------+
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4 | back chain (zero) | 0
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4 | reserved | 4
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88 | save area for (*func) | 8
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+-----------------------+
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n | overflow parameters | 96
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+-----------------------+
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4 | back chain (zero) | 0
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4 | reserved | 4
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88 | save area for (*func) | 8
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+-----------------------+
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n | overflow parameters | 96
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+-----------------------+
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The registers are set up like this:
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%r2-%r6: parameters 1 to 5
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%r7 : (*func) pointer
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@ -54,27 +54,27 @@ void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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extern void __makecontext_ret (void);
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unsigned long *sp;
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unsigned long int *sp;
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va_list ap;
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int i;
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sp = (unsigned long *) (((unsigned long) ucp->uc_stack.ss_sp
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+ ucp->uc_stack.ss_size) & -8L);
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sp = (unsigned long int *) (((unsigned long int) ucp->uc_stack.ss_sp
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+ ucp->uc_stack.ss_size) & -8L);
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/* Set the return address to trampoline. */
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ucp->uc_mcontext.gregs[14] = (long) __makecontext_ret;
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ucp->uc_mcontext.gregs[14] = (long int) __makecontext_ret;
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/* Set register parameters. */
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va_start (ap, argc);
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for (i = 0; (i < argc) && (i < 5); i++)
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ucp->uc_mcontext.gregs[2+i] = va_arg (ap, long);
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for (int i = 0; i < argc && i < 5; ++i)
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ucp->uc_mcontext.gregs[2 + i] = va_arg (ap, long int);
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/* The remaining arguments go to the overflow area. */
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if (argc > 5) {
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sp -= argc - 5;
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for (i = 5; i < argc; i++)
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sp[i] = va_arg(ap, long);
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}
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if (argc > 5)
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{
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sp -= argc - 5;
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for (int i = 5; i < argc; ++i)
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sp[i - 5] = va_arg (ap, long int);
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}
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va_end (ap);
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/* Make room for the save area and set the backchain. */
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@ -82,24 +82,24 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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*sp = 0;
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/* Pass (*func) to __start_context in %r7. */
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ucp->uc_mcontext.gregs[7] = (long) func;
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ucp->uc_mcontext.gregs[7] = (long int) func;
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/* Pass ucp->uc_link to __start_context in %r8. */
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ucp->uc_mcontext.gregs[8] = (long) ucp->uc_link;
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ucp->uc_mcontext.gregs[8] = (long int) ucp->uc_link;
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/* Pass address of setcontext in %r9. */
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ucp->uc_mcontext.gregs[9] = (long) &setcontext;
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ucp->uc_mcontext.gregs[9] = (long int) &setcontext;
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/* Set stack pointer. */
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ucp->uc_mcontext.gregs[15] = (long) sp;
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ucp->uc_mcontext.gregs[15] = (long int) sp;
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}
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asm(".text\n"
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".type __makecontext_ret,@function\n"
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"__makecontext_ret:\n"
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" basr %r14,%r7\n"
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" lr %r2,%r8\n"
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" br %r9\n"
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".size __makecontext_ret, .-__makecontext_ret");
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asm (".text\n"
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".type __makecontext_ret,@function\n"
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"__makecontext_ret:\n"
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" basr %r14,%r7\n"
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" lr %r2,%r8\n"
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" br %r9\n"
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".size __makecontext_ret, .-__makecontext_ret");
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weak_alias (__makecontext, makecontext)
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@ -1,4 +1,4 @@
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/* Copyright (C) 2001 Free Software Foundation, Inc.
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/* Copyright (C) 2001, 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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@ -29,14 +29,14 @@
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won't work.
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makecontext sets up a stack and the registers for the
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user context. The stack looks like this:
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size offset
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size offset
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%r15 -> +-----------------------+
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8 | back chain (zero) | 0
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8 | reserved | 8
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144 | save area for (*func) | 16
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+-----------------------+
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n | overflow parameters | 160
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+-----------------------+
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8 | back chain (zero) | 0
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8 | reserved | 8
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144 | save area for (*func) | 16
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+-----------------------+
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n | overflow parameters | 160
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+-----------------------+
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The registers are set up like this:
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%r2-%r6: parameters 1 to 5
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%r7 : (*func) pointer
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@ -54,27 +54,27 @@ void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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extern void __makecontext_ret (void);
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unsigned long *sp;
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unsigned long int *sp;
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va_list ap;
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int i;
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sp = (unsigned long *) (((unsigned long) ucp->uc_stack.ss_sp
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+ ucp->uc_stack.ss_size) & -8L);
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sp = (unsigned long int *) (((unsigned long int) ucp->uc_stack.ss_sp
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+ ucp->uc_stack.ss_size) & -8L);
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/* Set the return address to trampoline. */
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ucp->uc_mcontext.gregs[14] = (long) __makecontext_ret;
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ucp->uc_mcontext.gregs[14] = (long int) __makecontext_ret;
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/* Set register parameters. */
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va_start (ap, argc);
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for (i = 0; (i < argc) && (i < 5); i++)
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ucp->uc_mcontext.gregs[2+i] = va_arg (ap, long);
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for (int i = 0; i < argc && i < 5; ++i)
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ucp->uc_mcontext.gregs[2 + i] = va_arg (ap, long int);
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/* The remaining arguments go to the overflow area. */
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if (argc > 5) {
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sp -= argc - 5;
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for (i = 5; i < argc; i++)
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sp[i] = va_arg(ap, long);
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}
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if (argc > 5)
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{
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sp -= argc - 5;
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for (int i = 5; i < argc; ++i)
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sp[i - 5] = va_arg (ap, long int);
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}
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va_end (ap);
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/* Make room for the save area and set the backchain. */
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@ -82,24 +82,24 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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*sp = 0;
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/* Pass (*func) to __start_context in %r7. */
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ucp->uc_mcontext.gregs[7] = (long) func;
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ucp->uc_mcontext.gregs[7] = (long int) func;
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/* Pass ucp->uc_link to __start_context in %r8. */
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ucp->uc_mcontext.gregs[8] = (long) ucp->uc_link;
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ucp->uc_mcontext.gregs[8] = (long int) ucp->uc_link;
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/* Pass address of setcontext in %r9. */
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ucp->uc_mcontext.gregs[9] = (long) &setcontext;
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ucp->uc_mcontext.gregs[9] = (long int) &setcontext;
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/* Set stack pointer. */
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ucp->uc_mcontext.gregs[15] = (long) sp;
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ucp->uc_mcontext.gregs[15] = (long int) sp;
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}
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asm(".text\n"
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".type __makecontext_ret,@function\n"
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"__makecontext_ret:\n"
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" basr %r14,%r7\n"
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" lgr %r2,%r8\n"
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" br %r9\n"
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".size __makecontext_ret, .-__makecontext_ret");
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asm (".text\n"
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".type __makecontext_ret,@function\n"
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"__makecontext_ret:\n"
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" basr %r14,%r7\n"
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" lgr %r2,%r8\n"
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" br %r9\n"
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".size __makecontext_ret, .-__makecontext_ret");
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weak_alias (__makecontext, makecontext)
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