public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
From: Adhemerval Zanella <azanella@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/release/2.34/master] nios2: Remove _dl_skip_args usage (BZ# 29187)
Date: Fri, 10 Jun 2022 12:21:12 +0000 (GMT)	[thread overview]
Message-ID: <20220610122112.790D038293C6@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bb4148283fa7c52fbc7efe19e81cd129adc7fd61

commit bb4148283fa7c52fbc7efe19e81cd129adc7fd61
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu May 26 13:12:21 2022 -0300

    nios2: Remove _dl_skip_args usage (BZ# 29187)
    
    Since ad43cac44a the generic code already shuffles the argv/envp/auxv
    on the stack to remove the ld.so own arguments and thus _dl_skip_args
    is always 0.   So there is no need to adjust the argc or argv.
    
    Checked with qemu-user that arguments are correctly passed on both
    constructors and main program.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    (cherry picked from commit 4868ba5d257a7fb415674e79c4ae5a3af2827f55)

Diff:
---
 NEWS                       |  1 +
 sysdeps/nios2/dl-machine.h | 50 ++++++++++------------------------------------
 2 files changed, 11 insertions(+), 40 deletions(-)

diff --git a/NEWS b/NEWS
index fdd46be860..04fe72b5f6 100644
--- a/NEWS
+++ b/NEWS
@@ -102,6 +102,7 @@ The following bugs are resolved with this release:
   [29097] time: fchmodat does not handle 64 bit time_t for
     AT_SYMLINK_NOFOLLOW
   [29165] libc: [Regression] broken argv adjustment
+  [29187] dynamic-link: [regression] broken argv adjustment for nios2
   [29203] libc: daemon is not y2038 aware
   [29204] libc: getusershell is not 2038 aware
   [29207] libc: posix_fallocate fallback implementation is not y2038
diff --git a/sysdeps/nios2/dl-machine.h b/sysdeps/nios2/dl-machine.h
index 430ca5d7ae..47b3f6acd7 100644
--- a/sysdeps/nios2/dl-machine.h
+++ b/sysdeps/nios2/dl-machine.h
@@ -128,53 +128,23 @@ _start:\n\
         ldw r8, %call(_dl_nios2_get_gp_value)(r22)\n\
         callr r8\n\
         mov gp, r2\n\
-\n\
-        /* Find the number of arguments to skip.  */\n\
-        ldw r8, %got(_dl_skip_args)(r22)\n\
-        ldw r8, 0(r8)\n\
 \n\
         /* Find the main_map from the GOT.  */\n\
         ldw r4, %got(_rtld_local)(r22)\n\
         ldw r4, 0(r4)\n\
 \n\
-        /* Find argc.  */\n\
-        ldw r5, 0(sp)\n\
-        sub r5, r5, r8\n\
-        stw r5, 0(sp)\n\
-\n\
-        /* Find the first unskipped argument.  */\n\
-        slli r8, r8, 2\n\
-        addi r6, sp, 4\n\
-        add r9, r6, r8\n\
-        mov r10, r6\n\
-\n\
-        /* Shuffle argv down.  */\n\
-3:      ldw r11, 0(r9)\n\
-        stw r11, 0(r10)\n\
-        addi r9, r9, 4\n\
-        addi r10, r10, 4\n\
-        bne r11, zero, 3b\n\
+        /* Load adjusted argc.  */\n\
+        ldw r2, %got(_dl_argc)(r22)\n\
+	ldw r5, 0(r2)\n\
 \n\
-        /* Shuffle envp down.  */\n\
-        mov r7, r10\n\
-4:      ldw r11, 0(r9)\n\
-        stw r11, 0(r10)\n\
-        addi r9, r9, 4\n\
-        addi r10, r10, 4\n\
-        bne r11, zero, 4b\n\
-\n\
-        /* Shuffle auxv down.  */\n\
-5:      ldw r11, 4(r9)\n\
-        stw r11, 4(r10)\n\
-        ldw r11, 0(r9)\n\
-        stw r11, 0(r10)\n\
-        addi r9, r9, 8\n\
-        addi r10, r10, 8\n\
-        bne r11, zero, 5b\n\
-\n\
-        /* Update _dl_argv.  */\n\
+        /* Load adjsuted argv.  */\n\
         ldw r2, %got(_dl_argv)(r22)\n\
-        stw r6, 0(r2)\n\
+	ldw r6, 0(r2)\n\
+\n\
+	/* envp = argv + argc + 1  */\n\
+        addi r7, r5, 1\n\
+        slli r7, r7, 2\n\
+        add  r7, r7, r6\n\
 \n\
         /* Call _dl_init through the PLT.  */\n\
         ldw r8, %call(_dl_init)(r22)\n\


                 reply	other threads:[~2022-06-10 12:21 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220610122112.790D038293C6@sourceware.org \
    --to=azanella@sourceware.org \
    --cc=glibc-cvs@sourceware.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).