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Diffstat (limited to 'libc/sysdeps/linux/x86_64')
-rw-r--r--libc/sysdeps/linux/x86_64/crt0.S30
1 files changed, 24 insertions, 6 deletions
diff --git a/libc/sysdeps/linux/x86_64/crt0.S b/libc/sysdeps/linux/x86_64/crt0.S
index 82dd9a9df..fa08278d9 100644
--- a/libc/sysdeps/linux/x86_64/crt0.S
+++ b/libc/sysdeps/linux/x86_64/crt0.S
@@ -92,12 +92,25 @@ _start:
rtld_fini: %r9
stack_end: stack. */
+#if 0
+ /* glibc */
movq %rdx, %r9 /* Address of the shared library termination function. */
popq %rsi /* Pop the argument count. */
movq %rsp, %rdx /* argv starts just at the current stack top. */
movq %rsi, %rbx /* now we calc envp ... envp = argc */
+ addq $8, %rbx
shl $0x3, %rbx /* envp *= 8 */
addq %rdx, %rbx /* envp += argv */
+#else
+ /* uclibc */
+ movq %rdx, %r9 /* Address of the shared library termination function. */
+ popq %rdi /* Pop the argument count. */
+ movq %rsp, %rsi /* argv starts just at the current stack top. */
+ movq %rdi, %rdx /* now we calc envp ... envp = argc */
+ addq $8, %rdx
+ shl $0x3, %rdx /* envp *= 8 */
+ addq %rsi, %rdx /* envp += argv */
+#endif
/* Align the stack to a 16 byte boundary to follow the ABI. */
andq $~15, %rsp
@@ -127,9 +140,11 @@ _start:
#endif
/* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */
- pushq %rbx /* Environment pointer */
- pushq %rdx /* Argument pointer */
- pushq %rsi /* And the argument count */
+#if 0
+ pushq %rdx /* Environment pointer */
+ pushq %rsi /* Argument pointer */
+ pushq %rdi /* And the argument count */
+#endif
/* Ok, now run uClibc's main() -- shouldn't return */
#ifdef L_Scrt1
@@ -138,10 +153,13 @@ _start:
call __uClibc_start_main
#endif
#else
+
/* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */
- pushq %rbx /* Environment pointer */
- pushq %rdx /* Argument pointer */
- pushq %rsi /* And the argument count */
+#if 0
+ pushq %rdx /* Environment pointer */
+ pushq %rsi /* Argument pointer */
+ pushq %rdi /* And the argument count */
+#endif
#ifdef L_Scrt0
call *__uClibc_main@GOT(%rip)