x86-64: Remove sysdeps/x86_64/x32/dl-machine.h

Remove sysdeps/x86_64/x32/dl-machine.h by folding x32 ARCH_LA_PLTENTER,
ARCH_LA_PLTEXIT and RTLD_START into sysdeps/x86_64/dl-machine.h.  There
are no regressions on x86-64 nor x32.  There are no changes in x86-64
_dl_start_user.  On x32, _dl_start_user changes are

 <_dl_start_user>:
 	mov    %eax,%r12d
+	mov    %esp,%r13d
 	mov    (%rsp),%edx
 	mov    %edx,%esi
-	mov    %esp,%r13d
 	and    $0xfffffff0,%esp
 	mov    0x0(%rip),%edi        # <_dl_start_user+0x14>
 	lea    0x8(%r13,%rdx,4),%ecx

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>

2 files changed, 16 insertions, 87 deletions

diff --git a/sysdeps/x86_64/dl-machine.h b/sysdeps/x86_64/dl-machine.h
index a6de379..4f12955 100644
--- a/sysdeps/x86_64/dl-machine.h
+++ b/sysdeps/x86_64/dl-machine.h
@@ -139,37 +139,37 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
 .globl _start\n\
 .globl _dl_start_user\n\
 _start:\n\
-	movq %rsp, %rdi\n\
+	mov %" RSP_LP ", %" RDI_LP "\n\
 	call _dl_start\n\
 _dl_start_user:\n\
 	# Save the user entry point address in %r12.\n\
-	movq %rax, %r12\n\
+	mov %" RAX_LP ", %" R12_LP "\n\
 	# Save %rsp value in %r13.\n\
-	movq %rsp, %r13\n\
+	mov %" RSP_LP ", % " R13_LP "\n\
 "\
 	RTLD_START_ENABLE_X86_FEATURES \
 "\
 	# Read the original argument count.\n\
-	movq (%rsp), %rdx\n\
+	mov (%rsp), %" RDX_LP "\n\
 	# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
 	# argc -> rsi\n\
-	movq %rdx, %rsi\n\
+	mov %" RDX_LP ", %" RSI_LP "\n\
 	# And align stack for the _dl_init call. \n\
-	andq $-16, %rsp\n\
+	and $-16, %" RSP_LP "\n\
 	# _dl_loaded -> rdi\n\
-	movq _rtld_local(%rip), %rdi\n\
+	mov _rtld_local(%rip), %" RDI_LP "\n\
 	# env -> rcx\n\
-	leaq 16(%r13,%rdx,8), %rcx\n\
+	lea 2*" LP_SIZE "(%r13,%rdx," LP_SIZE "), %" RCX_LP "\n\
 	# argv -> rdx\n\
-	leaq 8(%r13), %rdx\n\
+	lea " LP_SIZE "(%r13), %" RDX_LP "\n\
 	# Clear %rbp to mark outermost frame obviously even for constructors.\n\
 	xorl %ebp, %ebp\n\
 	# Call the function to run the initializers.\n\
 	call _dl_init\n\
 	# Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\
-	leaq _dl_fini(%rip), %rdx\n\
+	lea _dl_fini(%rip), %" RDX_LP "\n\
 	# And make sure %rsp points to argc stored on the stack.\n\
-	movq %r13, %rsp\n\
+	mov %" R13_LP ", %" RSP_LP "\n\
 	# Jump to the user's entry point.\n\
 	jmp *%r12\n\
 .previous\n\
@@ -234,8 +234,13 @@ elf_machine_plt_value (struct link_map *map, const ElfW(Rela) *reloc,
 
 
 /* Names of the architecture-specific auditing callback functions.  */
+#ifdef __LP64__
 #define ARCH_LA_PLTENTER x86_64_gnu_pltenter
 #define ARCH_LA_PLTEXIT x86_64_gnu_pltexit
+#else
+#define ARCH_LA_PLTENTER x32_gnu_pltenter
+#define ARCH_LA_PLTEXIT x32_gnu_pltexit
+#endif
 
 #endif /* !dl_machine_h */
 
diff --git a/sysdeps/x86_64/x32/dl-machine.h b/sysdeps/x86_64/x32/dl-machine.h
deleted file mode 100644
index c35cee9..0000000
--- a/sysdeps/x86_64/x32/dl-machine.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/* Machine-dependent ELF dynamic relocation inline functions.  x32 version.
-   Copyright (C) 2012-2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-/* Must allow <sysdeps/x86_64/dl-machine.h> to be included more than once.
-   See #ifdef RESOLVE_MAP in sysdeps/x86_64/dl-machine.h.  */
-#include <sysdeps/x86_64/dl-machine.h>
-
-#ifndef _X32_DL_MACHINE_H
-#define _X32_DL_MACHINE_H
-
-#undef ARCH_LA_PLTENTER
-#undef ARCH_LA_PLTEXIT
-#undef RTLD_START
-
-/* Names of the architecture-specific auditing callback functions.  */
-#define ARCH_LA_PLTENTER x32_gnu_pltenter
-#define ARCH_LA_PLTEXIT x32_gnu_pltexit
-
-/* Initial entry point code for the dynamic linker.
-   The C function `_dl_start' is the real entry point;
-   its return value is the user program's entry point.  */
-#define RTLD_START asm ("\n\
-.text\n\
-	.p2align 4\n\
-.globl _start\n\
-.globl _dl_start_user\n\
-_start:\n\
-	movl %esp, %edi\n\
-	call _dl_start\n\
-_dl_start_user:\n\
-	# Save the user entry point address in %r12.\n\
-	movl %eax, %r12d\n\
-	# Read the original argument count.\n\
-	movl (%rsp), %edx\n\
-	# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
-	# argc -> rsi\n\
-	movl %edx, %esi\n\
-	# Save %rsp value in %r13.\n\
-	movl %esp, %r13d\n\
-	# And align stack for the _dl_init call.\n\
-	and $-16, %esp\n\
-	# _dl_loaded -> rdi\n\
-	movl _rtld_local(%rip), %edi\n\
-	# env -> rcx\n\
-	lea 8(%r13,%rdx,4), %ecx\n\
-	# argv -> rdx\n\
-	lea 4(%r13), %edx\n\
-	# Clear %rbp to mark outermost frame obviously even for constructors.\n\
-	xorl %ebp, %ebp\n\
-	# Call the function to run the initializers.\n\
-	call _dl_init\n\
-	# Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\
-	lea _dl_fini(%rip), %edx\n\
-	# And make sure %rsp points to argc stored on the stack.\n\
-	movl %r13d, %esp\n\
-	# Jump to the user's entry point.\n\
-	jmp *%r12\n\
-.previous\n\
-");
-
-#endif /* !_X32_DL_MACHINE_H */