path: root/sysdeps/powerpc/powerpc64/dl-trampoline.S

/* PLT trampolines.  PPC64 version.
   Copyright (C) 2005-2025 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/>.  */

#include <sysdep.h>
#include <rtld-global-offsets.h>


	.section ".text"
/* On entry r0 contains the index of the PLT entry we need to fixup
   and r11 contains the link_map (from PLT0+16).  The link_map becomes
   parm1 (r3) and the index (r0) need to be converted to an offset
   (index * 24) in parm2 (r4).  */

#define FRAME_SIZE (FRAME_MIN_SIZE+64)
/* We need to save the registers used to pass parameters, ie. r3 thru
   r10;  Use local var space rather than the parameter save area,
   because gcc as of 2010/05 doesn't allocate a proper stack frame for
   a function that makes no calls except for __tls_get_addr and we
   might be here resolving the __tls_get_addr call.  */
	.hidden _dl_runtime_resolve
#ifdef FRAME_ROP_SAVE
# define INT_PARMS FRAME_ROP_SAVE-64
#else
# define INT_PARMS -64
#endif
ENTRY (_dl_runtime_resolve, 4)
	std	r3,INT_PARMS+0(r1)
	mr	r3,r11
	std	r4,INT_PARMS+8(r1)
	sldi	r4,r0,1
	std	r5,INT_PARMS+16(r1)
	add	r4,r4,r0
	std	r6,INT_PARMS+24(r1)
	sldi	r4,r4,3
	std	r7,INT_PARMS+32(r1)
	mflr	r0
	std	r8,INT_PARMS+40(r1)
/* Store the LR in the LR Save area.  */
	std	r0,FRAME_LR_SAVE(r1)
	cfi_offset (lr, FRAME_LR_SAVE)
	std	r9,INT_PARMS+48(r1)
	std	r10,INT_PARMS+56(r1)
#ifdef __ROP_PROTECT__
	hashst	r0,FRAME_ROP_SAVE(r1)
#endif
	stdu	r1,-FRAME_SIZE(r1)
	cfi_adjust_cfa_offset (FRAME_SIZE)
	bl	JUMPTARGET(_dl_fixup)
#ifndef SHARED
	nop
#endif
/* Unwind the stack frame, and jump.  */
	addi	r1,r1,FRAME_SIZE
/* Put the registers back.  */
	ld	r0,FRAME_LR_SAVE(r1)
	ld	r10,INT_PARMS+56(r1)
	ld	r9,INT_PARMS+48(r1)
	ld	r8,INT_PARMS+40(r1)
	ld	r7,INT_PARMS+32(r1)
	mtlr	r0
	ld	r6,INT_PARMS+24(r1)
	ld	r5,INT_PARMS+16(r1)
	ld	r4,INT_PARMS+8(r1)
/* Prepare for calling the function returned by fixup.  */
	PPC64_LOAD_FUNCPTR r3
	ld	r3,INT_PARMS+0(r1)
#if _CALL_ELF == 2
/* Restore the caller's TOC in case we jump to a local entry point.  */
	ld	r2,FRAME_TOC_SAVE(r1)
#endif
#ifdef __ROP_PROTECT__
	hashchk	r0,FRAME_ROP_SAVE(r1)
#endif
	bctr
END(_dl_runtime_resolve)
#undef FRAME_SIZE
#undef INT_PARMS

	/* Stack layout:		ELFv2 ABI.
					+752   previous backchain
					+744   spill_r31
					+736   spill_r30
					+720   v8
					+704   v7
					+688   v6
					+672   v5
					+656   v4
					+640   v3
					+624   v2
					+608   v1
					+600   fp10
	  ELFv1 ABI			+592   fp9
	  +592   previous backchain	+584   fp8
	  +584   spill_r31		+576   fp7
	  +576   spill_r30		+568   fp6
	  +560   v1			+560   fp5
	  +552   fp4			+552   fp4
	  +544   fp3			+544   fp3
	  +536   fp2			+536   fp2
	  +528   fp1			+528   fp1
	  +520   r4			+520   r4
	  +512   r3			+512   r3
	   return values
	  +504   ROP save slot
	  +496   stackframe
	  +488   lr
	  +480   r1
	  +464   v13
	  +448   v12
	  +432   v11
	  +416   v10
	  +400   v9
	  +384   v8
	  +368   v7
	  +352   v6
	  +336   v5
	  +320   v4
	  +304   v3
	  +288   v2
	 * VMX Parms in V2-V13, V0-V1 are scratch
	  +284   vrsave
	  +280   free
	  +272   fp13
	  +264   fp12
	  +256   fp11
	  +248   fp10
	  +240   fp9
	  +232   fp8
	  +224   fp7
	  +216   fp6
	  +208   fp5
	  +200   fp4
	  +192   fp3
	  +184   fp2
	  +176   fp1
	 * FP Parms in FP1-FP13, FP0 is a scratch register
	  +168   r10
	  +160   r9
	  +152   r8
	  +144   r7
	  +136   r6
	  +128   r5
	  +120   r4
	  +112   r3
	 * Integer parms in R3-R10, R0 is scratch, R1 SP, R2 is TOC
	  +104   parm8
	  +96    parm7
	  +88    parm6
	  +80    parm5
	  +72    parm4
	  +64    parm3
	  +56    parm2
	  +48    parm1
	 * Parameter save area
	 * (v1 ABI: Allocated by the call, at least 8 double words)
	  +40    v1 ABI: TOC save area
	  +32    v1 ABI: Reserved for linker
	  +24    v1 ABI: Reserved for compiler / v2 ABI: TOC save area
	  +16    LR save area
	  +8     CR save area
	r1+0     stack back chain
	*/
#if _CALL_ELF == 2
# define FRAME_SIZE 752
# define VR_RTN 608
# undef FRAME_ROP_SAVE
# define FRAME_ROP_SAVE 504-FRAME_SIZE	/* Override the default value.  */
#else
# define FRAME_SIZE 592
# define VR_RTN 560
#endif
#define INT_RTN 512
#define FPR_RTN 528
#define STACK_FRAME 496
#define CALLING_LR 488
#define CALLING_SP 480
#define INT_PARMS 112
#define FPR_PARMS 176
#define VR_PARMS 288
#define VR_VRSAVE 284
	.section	".toc","aw"
.LC__dl_hwcap:
# ifdef SHARED
	.tc _rtld_local_ro[TC],_rtld_local_ro
# else
	.tc _dl_hwcap[TC],_dl_hwcap
# endif
	.section ".text"

	.machine	"altivec"
/* On entry r0 contains the index of the PLT entry we need to fixup
   and r11 contains the link_map (from PLT0+16).  The link_map becomes
   parm1 (r3) and the index (r0) needs to be converted to an offset
   (index * 24) in parm2 (r4).  */
#if !defined PROF && defined SHARED
	.hidden _dl_profile_resolve
ENTRY (_dl_profile_resolve, 4)
/* Spill r30, r31 to preserve the link_map* and reloc_addr, in case we
   need to call _dl_audit_pltexit.  */
	std	r31,-8(r1)
	std	r30,-16(r1)
/* We need to save the registers used to pass parameters, ie. r3 thru
   r10; the registers are saved in a stack frame.  */
	stdu	r1,-FRAME_SIZE(r1)
	cfi_adjust_cfa_offset (FRAME_SIZE)
	cfi_offset(r31,-8)
	cfi_offset(r30,-16