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[hppa] Fix *context stack usage for varargs
The getcontext, and setcontext functions should not adjust the stack, and should load the stack pointer from the machine context. Calling makecontext should create a frame for spilled incoming arguments, and sync uc_stack.ss_sp to the machine context. We do not support calling getcontext, modifying ss_sp, and calling setcontext directly.
This commit is contained in:
Carlos O'Donell
parent
fdb3ec206e
commit
131fafa7da
@ -1,3 +1,16 @@
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2010-06-23 Carlos O'Donell <carlos@codesourcery.com>
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* sysdeps/unix/sysv/linux/hppa/getcontext.S (__getcontext_ret):
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Document that this function is a non-standard calling ABI.
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Document register usage.
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(__getcontext): Use normal %sp without adjustment. Use named
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resgister %sp.
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* sysdeps/unix/sysv/linux/hppa/makecontext.c: Remove FRAME_SIZE.
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Define FRAME_SIZE_UL, FRAME_SIZE_BYTES, ARGS.
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(__makecontext): Create and setup a stack frame.
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* sysdeps/unix/sysv/linux/hppa/setcontext.S (__setcontext):
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Use named register %sp. Do not use oSS_SP.
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2010-06-07 Andreas Schwab <schwab@redhat.com>
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* sysdeps/unix/sysv/linux/hppa/nptl/pthread.h: Update to agree
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@ -23,17 +23,21 @@
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#include "ucontext_i.h"
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/* Trampoline function. */
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/* Trampoline function. Non-standard calling ABI. */
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/* Can not use ENTRY(__getcontext_ret) here. */
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.type __getcontext_ret, @function
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.hidden __getcontext_ret
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__getcontext_ret:
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.proc
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.callinfo FRAME=0,NO_CALLS
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/* r26-r23 contain original r3-r6, but because setcontext
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does not reload r3-r6 (it's using them as temporaries)
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we must save them elsewhere and swap them back in. */
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copy %r23, %r3
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copy %r24, %r4
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copy %r25, %r5
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copy %r26, %r6
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/* r20 contains original return pointer. */
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bv 0(%r20)
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copy %r0, %ret0
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.procend
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@ -72,13 +76,12 @@ ENTRY(__getcontext)
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stw %r27, oR27(%r26)
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stw %r28, oR28(%r26)
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stw %r29, oR29(%r26)
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ldo -64(%sp), %r1 /* Calculate %sp in %r1. */
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stw %r1, oR30(%r26) /* Save new %sp. */
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stw %sp, oR30(%r26)
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stw %r31, oR31(%r26)
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stw %r0, oUC_FLAGS(%r26)
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/* stw %r0, oUC_LINK(%r26) - Do not overwrite. */
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stw %r1, oSS_SP(%r26)
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stw %sp, oSS_SP(%r26)
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stw %r0, oSS_FLAGS(%r26)
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stw %r0, oSS_SIZE(%r26)
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@ -127,9 +130,9 @@ ENTRY(__getcontext)
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fstds %fr31, 0(%r1)
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/* Prologue */
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stwm %r4, 64(%r30)
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stwm %r4, 64(%sp)
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#ifdef PIC
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stw %r19, -32(%r30)
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stw %r19, -32(%sp)
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#endif
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/* Set up the trampoline registers.
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@ -152,12 +155,12 @@ ENTRY(__getcontext)
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ldi SIG_BLOCK, %r26
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/* Epilogue */
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ldw -84(%r30), %r2
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ldw -84(%sp), %r2
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#ifdef PIC
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ldw -96(%r30), %r19
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ldw -96(%sp), %r19
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#endif
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bv %r0(%r2)
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ldwm -64(%r30), %r4
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ldwm -64(%sp), %r4
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END(__getcontext)
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weak_alias (__getcontext, getcontext)
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@ -26,26 +26,57 @@
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#include <ucontext.h>
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/* POSIX only supports integer arguments. */
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/* Stack must be 64-byte aligned at all times. */
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#define STACK_ALIGN 64
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#define FRAME_SIZE 8
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/* Size of frame marker in unsigned long words. */
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#define FRAME_SIZE_UL 8
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/* Size of frame marker in bytes. */
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#define FRAME_SIZE_BYTES (8 * sizeof(unsigned long))
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/* Size of X arguments in bytes. */
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#define ARGS(x) (x * sizeof(unsigned long))
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void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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unsigned long *sp;
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unsigned long *sp, *osp;
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va_list ap;
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int i;
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/* Get stack pointer (64-byte aligned). */
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sp = (unsigned long *)((((unsigned long) ucp->uc_stack.ss_sp)
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+ FRAME_SIZE + argc + STACK_ALIGN)
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& ~(STACK_ALIGN - 1));
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/* Create a 64-byte aligned frame to store args. Use ss_sp if
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it is available, otherwise be robust and use the currently
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saved stack pointer. */
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if (ucp->uc_stack.ss_sp && ucp->uc_stack.ss_size)
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osp = (unsigned long *)ucp->uc_stack.ss_sp;
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else
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osp = (unsigned long *)ucp->uc_mcontext.sc_gr[30];
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sp = (unsigned long *)((((unsigned long) osp)
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+ FRAME_SIZE_BYTES + ARGS(argc) + STACK_ALIGN)
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& ~(STACK_ALIGN - 1));
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/* Use new frame. */
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ucp->uc_mcontext.sc_gr[30] = ((unsigned long) sp);
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/* Finish frame setup. */
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if (ucp->uc_link)
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{
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/* Returning to the next context and next frame. */
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sp[-4/sizeof(unsigned long)] = ucp->uc_link->uc_mcontext.sc_gr[30];
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sp[-20/sizeof(unsigned long)] = ucp->uc_link->uc_mcontext.sc_gr[2];
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}
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else
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{
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/* This is the main context. No frame marker, and no return address. */
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sp[-4/sizeof(unsigned long)] = 0x0;
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sp[-20/sizeof(unsigned long)] = 0x0;
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}
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/* Store address to jump to. */
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ucp->uc_mcontext.sc_gr[2] = (unsigned long) func;
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/* Process arguments. */
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va_start (ap, argc);
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/* Handle arguments. */
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for (i = 0; i < argc; ++i)
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{
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if (i < 4)
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@ -62,13 +93,9 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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}
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/* All other arguments go on the stack. */
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sp[-1 * (FRAME_SIZE + 1 + i)] = va_arg (ap, int);
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sp[-1 * (FRAME_SIZE_UL + 1 + i)] = va_arg (ap, int);
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}
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va_end (ap);
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/* Adjust the stack pointer to last used argument. */
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ucp->uc_mcontext.sc_gr[30] = (unsigned long) sp;
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}
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weak_alias(__makecontext, makecontext)
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@ -25,9 +25,9 @@
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ENTRY(__setcontext)
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/* Prologue */
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stwm %r3, 64(%r30)
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stwm %r3, 64(%sp)
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#ifdef PIC
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stw %r19, -32(%r30)
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stw %r19, -32(%sp)
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#endif
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/* Save ucp. */
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@ -78,7 +78,7 @@ ENTRY(__setcontext)
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ldw oR27(%r3), %r27
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ldw oR28(%r3), %r28
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ldw oR29(%r3), %r29
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ldw oR30(%r3), %r30
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ldw oR30(%r3), %sp
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/* ldw oR31(%r3), %r31 - dyncall scratch register */
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/* Restore floating-point registers. */
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@ -116,9 +116,13 @@ ENTRY(__setcontext)
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fldds,mb -8(%r22), %fr1
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fldds,mb -8(%r22), %fr0
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/* Calculate new stack pointer. */
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ldw oSS_SP(%r3), %sp
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ldo 64(%sp), %sp
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/* Do not load oSS_SP into %sp. The value of oSS_SP indicates
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the start of the user allocated stack, but not the sp that
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should be used by the new context. In fact makecontext
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will create a frame, and adjust sp as required. We do not
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support calling getcontext and modifying ss_sp without
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a call to makecontext to synchronize ss_sp into the machine
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context. */
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/* Call external function. */
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copy %r2, %r22
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