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--- lwp-1.9/src/process.S.amd64 2001-10-04 23:14:08.000000000 +0200
+++ lwp-1.9/src/process.S 2003-09-26 17:18:35.000000000 +0200
@@ -472,6 +472,61 @@ ENTRY(returnto)
#endif /* i386 */
+#if defined(__x86_64__)
+
+#ifdef __linux__
+#include <linux/linkage.h>
+#endif
+
+#define FRAME_SIZE (8*8)
+
+/*
+ savecontext(f, area1, newsp)
+ int (*f)();
+ struct savearea *area1;
+ char *newsp;
+
+*/
+
+#define f rdi
+#define area1 rsi
+#define newsp rdx
+#define topstack 0
+
+ .text
+ENTRY(savecontext)
+ sub $FRAME_SIZE, %rsp
+ mov %rbx, (0*8)(%rsp) /* Save registers. */
+ mov %rbp, (1*8)(%rsp)
+ mov %r12, (2*8)(%rsp)
+ mov %r13, (3*8)(%rsp)
+ mov %r14, (4*8)(%rsp)
+ mov %r15, (5*8)(%rsp)
+ mov %rsp, topstack(%area1) /* Store sp in savearea. */
+ cmp $0, %newsp
+ cmovne %newsp, %rsp /* Don't change the stack if newsp is zero. */
+ jmp *%f /* f(); */
+
+/*
+ returnto(area2)
+ struct savearea *area2;
+*/
+
+#define area2 rdi
+
+ENTRY(returnto)
+ mov topstack(%area2), %rsp /* Restore stack pointer. */
+ mov (0*8)(%rsp), %rbx /* Restore registers. */
+ mov (1*8)(%rsp), %rbp
+ mov (2*8)(%rsp), %r12
+ mov (3*8)(%rsp), %r13
+ mov (4*8)(%rsp), %r14
+ mov (5*8)(%rsp), %r15
+ add $FRAME_SIZE, %rsp
+ ret
+
+#endif /* amd64 */
+
#ifdef luna88k
/* Luna88K Code from Dan Stodolsky via Brad White */
--- lwp-1.9/src/lwp.c.amd64 2001-04-02 14:16:16.000000000 +0200
+++ lwp-1.9/src/lwp.c 2003-09-26 17:14:30.000000000 +0200
@@ -565,6 +565,14 @@ int LWP_CreateProcess(PFIC ep, int stack
#else
pagesize = getpagesize();
+#if defined(__x86_64__)
+ /* [gb] Ensure minimal stack size. Heuristically determined
+ through tdb test that 2048 is too small when printf() et al. come
+ into action. */
+ if (stacksize < pagesize)
+ stacksize = pagesize;
+#endif
+
#ifdef MAP_ANON
stackptr = mmap(lwp_stackbase, stacksize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
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