From cf043d56638883157dbfaa8c6a8e2f63a6f66280 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Thu, 29 Nov 2018 17:29:35 -0800
Subject: [PATCH 26/29] inject file assembly directives

Currently, non-IA builds are not reproducibile since build paths are
being injected into the debug symbols. These are coming from the use of
.S assembler files during the glibc build. No STT_FILE section is added
during the assembly but when linking, ld decides to add one to aid
debugging and ensure references between the different object files its
linking remain clear.

We can avoid this by injecting a file header into the assembler files
ahead of time, choosing a filename which does not contain build system
paths.

This is a bit of a workaround/hack but does significantly reduce the
build system references in target binaries for the non-IA architectures
which use .S files.

RP
2018/10/3

Upstream-Status: Pending

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 csu/abi-note.c                                | 2 ++
 sysdeps/aarch64/crti.S                        | 2 ++
 sysdeps/aarch64/crtn.S                        | 1 +
 sysdeps/aarch64/dl-tlsdesc.S                  | 2 ++
 sysdeps/aarch64/dl-trampoline.S               | 2 ++
 sysdeps/aarch64/start.S                       | 2 ++
 sysdeps/arm/crti.S                            | 2 ++
 sysdeps/arm/crtn.S                            | 2 ++
 sysdeps/arm/dl-tlsdesc.S                      | 2 ++
 sysdeps/arm/dl-trampoline.S                   | 2 ++
 sysdeps/arm/start.S                           | 2 ++
 sysdeps/mips/start.S                          | 2 ++
 sysdeps/powerpc/powerpc32/dl-start.S          | 2 ++
 sysdeps/powerpc/powerpc32/start.S             | 2 ++
 sysdeps/powerpc/powerpc64/start.S             | 2 ++
 sysdeps/unix/sysv/linux/aarch64/__read_tp.S   | 2 ++
 sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S   | 2 ++
 sysdeps/unix/sysv/linux/arm/libc-do-syscall.S | 2 ++
 sysdeps/unix/sysv/linux/powerpc/dl-brk.S      | 2 ++
 19 files changed, 37 insertions(+)

--- a/sysdeps/aarch64/crti.S
+++ b/sysdeps/aarch64/crti.S
@@ -50,6 +50,8 @@
 # define PREINIT_FUNCTION_WEAK 1
 #endif
 
+    .file "crti.S"
+
 #if PREINIT_FUNCTION_WEAK
 	weak_extern (PREINIT_FUNCTION)
 #else
--- a/sysdeps/aarch64/crtn.S
+++ b/sysdeps/aarch64/crtn.S
@@ -38,6 +38,7 @@
    corresponding to the prologues in crti.S. */
 
 #include <sysdep.h>
+	.file "crtn.S"
 
 	.section .init,"ax",%progbits
 	ldp	x29, x30, [sp], 16
--- a/sysdeps/aarch64/dl-tlsdesc.S
+++ b/sysdeps/aarch64/dl-tlsdesc.S
@@ -22,6 +22,8 @@
 #include <tls.h>
 #include "tlsdesc.h"
 
+	.file "dl-tlsdesc.S"
+
 #define NSAVEDQREGPAIRS	16
 #define SAVE_Q_REGISTERS				\
 	stp	q0, q1,	[sp, #-32*NSAVEDQREGPAIRS]!;	\
--- a/sysdeps/aarch64/dl-trampoline.S
+++ b/sysdeps/aarch64/dl-trampoline.S
@@ -21,6 +21,8 @@
 
 #include "dl-link.h"
 
+	.file "dl-trampoline.S"
+
 #define ip0 x16
 #define ip0l PTR_REG (16)
 #define ip1 x17
--- a/sysdeps/aarch64/start.S
+++ b/sysdeps/aarch64/start.S
@@ -18,6 +18,8 @@
 
 #include <sysdep.h>
 
+	.file "start.S"
+
 /* This is the canonical entry point, usually the first thing in the text
    segment.
 
--- a/sysdeps/arm/crti.S
+++ b/sysdeps/arm/crti.S
@@ -57,6 +57,8 @@
 	.hidden PREINIT_FUNCTION
 #endif
 
+    .file "crti.S"
+
 #if PREINIT_FUNCTION_WEAK
 	.p2align 2
 	.type call_weak_fn, %function
--- a/sysdeps/arm/crtn.S
+++ b/sysdeps/arm/crtn.S
@@ -37,6 +37,8 @@
 #define NO_THUMB
 #include <sysdep.h>
 
+    .file "crtn.S"
+
 /* crtn.S puts function epilogues in the .init and .fini sections
    corresponding to the prologues in crti.S. */
 
--- a/sysdeps/arm/dl-tlsdesc.S
+++ b/sysdeps/arm/dl-tlsdesc.S
@@ -21,6 +21,8 @@
 #include <tls.h>
 #include "tlsdesc.h"
 
+	.file "dl-tlsdesc.S"
+
 	.text
 	@ emit debug information with cfi
 	@ use arm-specific pseudos for unwinding itself
--- a/sysdeps/arm/dl-trampoline.S
+++ b/sysdeps/arm/dl-trampoline.S
@@ -21,6 +21,8 @@
 #include <sysdep.h>
 #include <libc-symbols.h>
 
+	.file "dl-trampoline.S"
+
 	.text
 	.globl _dl_runtime_resolve
 	.type _dl_runtime_resolve, #function
--- a/sysdeps/arm/start.S
+++ b/sysdeps/arm/start.S
@@ -57,6 +57,8 @@
 					NULL
 */
 
+	.file "start.S"
+
 /* Tag_ABI_align8_preserved: This code preserves 8-byte
    alignment in any callee.  */
 	.eabi_attribute 25, 1
--- a/sysdeps/mips/start.S
+++ b/sysdeps/mips/start.S
@@ -38,6 +38,8 @@
 #include <sgidefs.h>
 #include <sys/asm.h>
 
+	.file "start.S"
+
 #ifndef ENTRY_POINT
 #error ENTRY_POINT needs to be defined for start.S on MIPS/ELF.
 #endif
--- a/sysdeps/powerpc/powerpc32/dl-start.S
+++ b/sysdeps/powerpc/powerpc32/dl-start.S
@@ -18,6 +18,8 @@
 
 #include <sysdep.h>
 
+	.file "dl-start.S"
+
 /* 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.	*/
--- a/sysdeps/powerpc/powerpc32/start.S
+++ b/sysdeps/powerpc/powerpc32/start.S
@@ -35,6 +35,8 @@
 
 #include <sysdep.h>
 
+	.file "start.S"
+
 /* We do not want .eh_frame info for crt1.o since crt1.o is linked
    before crtbegin.o, the file defining __EH_FRAME_BEGIN__.  */
 #undef cfi_startproc
--- a/sysdeps/powerpc/powerpc64/start.S
+++ b/sysdeps/powerpc/powerpc64/start.S
@@ -35,6 +35,8 @@
 
 #include <sysdep.h>
 
+	.file "start.S"
+
 /* We do not want .eh_frame info for crt1.o since crt1.o is linked
    before crtbegin.o, the file defining __EH_FRAME_BEGIN__.  */
 #undef cfi_startproc
--- a/sysdeps/unix/sysv/linux/aarch64/__read_tp.S
+++ b/sysdeps/unix/sysv/linux/aarch64/__read_tp.S
@@ -18,6 +18,8 @@
 
 #include <sysdep.h>
 
+	.file "__read_tp.S"
+
 	.hidden __read_tp
 ENTRY (__read_tp)
 	mrs	x0, tpidr_el0
--- a/sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S
+++ b/sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S
@@ -39,6 +39,8 @@
    a normal function call) in a high page of memory; tail call to the
    helper.  */
 
+	.file "aeabi_read_tp.S"
+
 	.hidden __aeabi_read_tp
 ENTRY (__aeabi_read_tp)
 #ifdef ARCH_HAS_HARD_TP
--- a/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S
+++ b/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S
@@ -27,6 +27,8 @@
    ARM unwind tables for register to register moves, the actual opcodes
    are not defined.  */
 
+      .file "libc-do-syscall.S"
+
 #if defined(__thumb__)
 	.thumb
 	.syntax unified
--- a/sysdeps/unix/sysv/linux/powerpc/dl-brk.S
+++ b/sysdeps/unix/sysv/linux/powerpc/dl-brk.S
@@ -1 +1,3 @@
+	.file "dl-brk.S"
+
 #include <brk.S>