[glibc] ia64: Remove _dl_skip_args usage

[glibc] ia64: Remove _dl_skip_args usage

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=57bb1e5b9fce7f3797bdb3005065187ba9d66c59

commit 57bb1e5b9fce7f3797bdb3005065187ba9d66c59
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu May 26 13:08:01 2022 -0300

    ia64: Remove _dl_skip_args usage
    
    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.
    
    The startup code is changed to read the _dl_argc and _dl_argv values,
    and envp is calculated from argc and argv.
    
    Checked on ia64-linux-gnu.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 sysdeps/ia64/dl-machine.h | 70 ++++++++++-------------------------------------
 1 file changed, 14 insertions(+), 56 deletions(-)

diff --git a/sysdeps/ia64/dl-machine.h b/sysdeps/ia64/dl-machine.h
index 20e586aa35..704dbd1f8c 100644
--- a/sysdeps/ia64/dl-machine.h
+++ b/sysdeps/ia64/dl-machine.h
@@ -201,81 +201,39 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
 "	 .save ar.pfs, r32\n"						      \
 "	 .body\n"							      \
 "	{ .mii\n"							      \
-"	  addl r3 = @gprel(_dl_skip_args), gp\n"			      \
-"	  adds r11 = 24, sp	/* Load the address of argv. */\n"	      \
 "	  /* Save the pointer to the user entry point fptr in loc2.  */\n"    \
 "	  mov loc2 = ret0\n"						      \
+"	  addl r2 = @ltoff(_dl_argc), gp\n"				      \
 "	  ;;\n"								      \
 "	}\n"								      \
 "	{ .mii\n"							      \
-"	  ld4 r3 = [r3]\n"						      \
-"	  adds r10 = 16, sp	/* Load the address of argc. */\n"	      \
-"	  mov out2 = r11\n"						      \
-"	  ;;\n"								      \
-"	  /* See if we were run as a command with the executable file\n"      \
-"	     name as an extra leading argument.  If so, adjust the argv\n"    \
-"	     pointer to skip _dl_skip_args words.\n"			      \
-"	     Note that _dl_skip_args is an integer, not a long - Jes\n"	      \
-"\n"									      \
-"	     The stack pointer has to be 16 byte aligned. We cannot simply\n" \
-"	     addjust the stack pointer. We have to move the whole argv and\n" \
-"	     envp and adjust _dl_argv by _dl_skip_args.  H.J.  */\n"	      \
-"	}\n"								      \
-"	{ .mib\n"							      \
-"	  ld8 out1 = [r10]	/* is argc actually stored as a long\n"	      \
-"				   or as an int? */\n"			      \
-"	  addl r2 = @ltoff(_dl_argv), gp\n"				      \
+"	  ld8 out1 = [r2]	/* Get the _dl_argc address.  */\n"	      \
+"	  addl r3 = @ltoff(_dl_argv), gp\n"				      \
 "	  ;;\n"								      \
 "	}\n"								      \
 "	{ .mmi\n"							      \
-"	  ld8 r2 = [r2]		/* Get the address of _dl_argv. */\n"	      \
-"	  sub out1 = out1, r3	/* Get the new argc. */\n"		      \
-"	  shladd r3 = r3, 3, r0\n"					      \
-"	  ;;\n"								      \
-"	}\n"								      \
-"	{\n"								      \
-"	  .mib\n"							      \
-"	  ld8 r17 = [r2]	/* Get _dl_argv. */\n"			      \
-"	  add r15 = r11, r3	/* The address of the argv we move */\n"      \
-"	  ;;\n"								      \
-"	}\n"								      \
-"	/* ??? Could probably merge these two loops into 3 bundles.\n"	      \
-"	   using predication to control which set of copies we're on.  */\n"  \
-"1:	/* Copy argv. */\n"						      \
-"	{ .mfi\n"							      \
-"	  ld8 r16 = [r15], 8	/* Load the value in the old argv. */\n"      \
+"	  ld8 out2 = [r3]	/* Get the _dl_argv address.  */\n"	      \
+"	  ld8 out1 = [out1]	/* Get the adjusted _dl_argc.  */\n"	      \
+"	  addl r2 = @gprel(_rtld_local), gp\n"				      \
 "	  ;;\n"								      \
 "	}\n"								      \
-"	{ .mib\n"							      \
-"	  st8 [r11] = r16, 8	/* Store it in the new argv. */\n"	      \
-"	  cmp.ne p6, p7 = 0, r16\n"					      \
-"(p6)	  br.cond.dptk.few 1b\n"					      \
+"	{ .mmi\n"							      \
+"	  sxt4 out3 = out1	/* envp = argv + argc + 1  */\n" 	      \
 "	  ;;\n"								      \
 "	}\n"								      \
 "	{ .mmi\n"							      \
-"	  mov out3 = r11\n"						      \
-"	  sub r17 = r17, r3	/* Substract _dl_skip_args. */\n"	      \
-"	  addl out0 = @gprel(_rtld_local), gp\n"			      \
-"	}\n"								      \
-"1:	/* Copy env. */\n"						      \
-"	{ .mfi\n"							      \
-"	  ld8 r16 = [r15], 8	/* Load the value in the old env. */\n"	      \
+"	  adds out3 = 1, out3\n"					      \
 "	  ;;\n"								      \
 "	}\n"								      \
-"	{ .mib\n"							      \
-"	  st8 [r11] = r16, 8	/* Store it in the new env. */\n"	      \
-"	  cmp.ne p6, p7 = 0, r16\n"					      \
-"(p6)	  br.cond.dptk.few 1b\n"					      \
+"	{ .mmi\n"							      \
+"	  ld8 out2 = [out2]	/* Get the adjusted _dl_argv.  */\n"	      \
+"	  shladd out3 = out3, 3, r0\n"					      \
 "	  ;;\n"								      \
 "	}\n"								      \
 "	{ .mmb\n"							      \
-"	  st8 [r10] = out1		/* Record the new argc. */\n"	      \
-"	  ld8 out0 = [out0]		/* get the linkmap */\n"	      \
-"	}\n"								      \
-"	{ .mmb\n"							      \
-"	  st8 [r2] = r17		/* Load the new _dl_argv. */\n"	      \
+"	  add out3 = out3, out2\n"					      \
+"	  ld8 out0 = [r2]	/* Get the linkmap. */\n"		      \
 "	  br.call.sptk.many b0 = _dl_init#\n"				      \
-"	  ;;\n"								      \
 "	}\n"								      \
 "	/* Pass our finalizer function to the user,\n"			      \
 "	   and jump to the user's entry point.  */\n"			      \