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glibc/sysdeps/powerpc/powerpc64/dl-trampoline.S

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/* PLT trampolines. PPC64 version.
Copyright (C) 2005-2013 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
<http://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 176
/* 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. */
#define INT_PARMS 112
EALIGN(_dl_runtime_resolve, 4, 0)
stdu r1,-FRAME_SIZE(r1)
cfi_adjust_cfa_offset (FRAME_SIZE)
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_SIZE+16(r1)
cfi_offset (lr, 16)
mfcr r0
std r9,INT_PARMS+48(r1)
std r10,INT_PARMS+56(r1)
/* I'm almost certain we don't have to save cr... be safe. */
std r0,FRAME_SIZE+8(r1)
bl JUMPTARGET(_dl_fixup)
#ifndef SHARED
nop
#endif
/* Put the registers back. */
ld r0,FRAME_SIZE+16(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 r0,FRAME_SIZE+8(r1)
ld r6,INT_PARMS+24(r1)
ld r5,INT_PARMS+16(r1)
ld r4,INT_PARMS+8(r1)
mtcrf 0xFF,r0
/* Load the target address, toc and static chain reg from the function
descriptor returned by fixup. */
ld r0,0(r3)
ld r2,8(r3)
mtctr r0
ld r11,16(r3)
ld r3,INT_PARMS+0(r1)
/* Unwind the stack frame, and jump. */
addi r1,r1,FRAME_SIZE
bctr
END(_dl_runtime_resolve)
#undef FRAME_SIZE
#undef INT_PARMS
/* Stack layout:
+592 previous backchain
+584 spill_r31
+576 spill_r30
+560 v1
+552 fp4
+544 fp3
+536 fp2
+528 fp1
+520 r4
+512 r3
return values
+504 free
+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, Allocated by the call, at least 8 double words
+40 TOC save area
+32 Reserved for linker
+24 Reserved for compiler
+16 LR save area
+8 CR save area
r1+0 stack back chain
*/
#define FRAME_SIZE 592
#define INT_RTN 512
#define FPR_RTN 528
#define VR_RTN 560
#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). */
#ifndef PROF
EALIGN(_dl_profile_resolve, 4, 0)
/* Spill r30, r31 to preserve the link_map* and reloc_addr, in case we
need to call _dl_call_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)
std r3,INT_PARMS+0(r1)
mr r3,r11
std r4,INT_PARMS+8(r1)
sldi r4,r0,1 /* index * 2 */
std r5,INT_PARMS+16(r1)
add r4,r4,r0 /* index * 3 */
std r6,INT_PARMS+24(r1)
sldi r4,r4,3 /* index * 24 == PLT offset */
mflr r5
std r7,INT_PARMS+32(r1)
std r8,INT_PARMS+40(r1)
/* Store the LR in the LR Save area of the previous frame. */
/* XXX Do we have to do this? */
la r8,FRAME_SIZE(r1)
std r5,FRAME_SIZE+16(r1)
cfi_offset (lr, 16)
std r5,CALLING_LR(r1)
mfcr r0
std r9,INT_PARMS+48(r1)
std r10,INT_PARMS+56(r1)
std r8,CALLING_SP(r1)
/* I'm almost certain we don't have to save cr... be safe. */
std r0,FRAME_SIZE+8(r1)
ld r12,.LC__dl_hwcap@toc(r2)
#ifdef SHARED
/* Load _rtld_local_ro._dl_hwcap. */
ld r12,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r12)
#else
ld r12,0(r12) /* Load extern _dl_hwcap. */
#endif
andis. r0,r12,(PPC_FEATURE_HAS_ALTIVEC >> 16)
beq L(saveFP)
la r10,(VR_PARMS+0)(r1)
la r9,(VR_PARMS+16)(r1)
li r11,32
li r12,64
stvx v2,0,r10
stvx v3,0,r9
stvx v4,r11,r10
stvx v5,r11,r9
addi r11,r11,64
stvx v6,r12,r10
stvx v7,r12,r9
addi r12,r12,64
stvx v8,r11,r10
stvx v9,r11,r9
addi r11,r11,64
stvx v10,r12,r10
stvx v11,r12,r9
mfspr r0,VRSAVE
stvx v12,r11,r10
stvx v13,r11,r9
L(saveFP):
stw r0,VR_VRSAVE(r1)
/* Save floating registers. */
stfd fp1,FPR_PARMS+0(r1)
stfd fp2,FPR_PARMS+8(r1)
stfd fp3,FPR_PARMS+16(r1)
stfd fp4,FPR_PARMS+24(r1)
stfd fp5,FPR_PARMS+32(r1)
stfd fp6,FPR_PARMS+40(r1)
stfd fp7,FPR_PARMS+48(r1)
stfd fp8,FPR_PARMS+56(r1)
stfd fp9,FPR_PARMS+64(r1)
stfd fp10,FPR_PARMS+72(r1)
stfd fp11,FPR_PARMS+80(r1)
li r0,-1
stfd fp12,FPR_PARMS+88(r1)
stfd fp13,FPR_PARMS+96(r1)
/* Load the extra parameters. */
addi r6,r1,INT_PARMS
addi r7,r1,STACK_FRAME
/* Save link_map* and reloc_addr parms for later. */
mr r31,r3
mr r30,r4
std r0,0(r7)
bl JUMPTARGET(_dl_profile_fixup)
#ifndef SHARED
nop
#endif
/* Test *framesizep > 0 to see if need to do pltexit processing. */
ld r0,STACK_FRAME(r1)
/* Put the registers back. */
lwz r12,VR_VRSAVE(r1)
cmpdi cr1,r0,0
cmpdi cr0,r12,0
bgt cr1,L(do_pltexit)
la r10,(VR_PARMS+0)(r1)
la r9,(VR_PARMS+16)(r1)
/* VRSAVE must be non-zero if VMX is present and VRs are in use. */
beq L(restoreFXR)
li r11,32
li r12,64
lvx v2,0,r10
lvx v3,0,r9
lvx v4,r11,r10
lvx v5,r11,r9
addi r11,r11,64
lvx v6,r12,r10
lvx v7,r12,r9
addi r12,r12,64
lvx v8,r11,r10
lvx v9,r11,r9
addi r11,r11,64
lvx v10,r12,r10
lvx v11,r12,r9
lvx v12,r11,r10
lvx v13,r11,r9
L(restoreFXR):
ld r0,FRAME_SIZE+16(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 r0,FRAME_SIZE+8(r1)
ld r6,INT_PARMS+24(r1)
ld r5,INT_PARMS+16(r1)
ld r4,INT_PARMS+8(r1)
mtcrf 0xFF,r0
/* Load the target address, toc and static chain reg from the function
descriptor returned by fixup. */
ld r0,0(r3)
ld r2,8(r3)
ld r11,16(r3)
ld r3,INT_PARMS+0(r1)
mtctr r0
/* Load the floating point registers. */
lfd fp1,FPR_PARMS+0(r1)
lfd fp2,FPR_PARMS+8(r1)
lfd fp3,FPR_PARMS+16(r1)
lfd fp4,FPR_PARMS+24(r1)
lfd fp5,FPR_PARMS+32(r1)
lfd fp6,FPR_PARMS+40(r1)
lfd fp7,FPR_PARMS+48(r1)
lfd fp8,FPR_PARMS+56(r1)
lfd fp9,FPR_PARMS+64(r1)
lfd fp10,FPR_PARMS+72(r1)
lfd fp11,FPR_PARMS+80(r1)
lfd fp12,FPR_PARMS+88(r1)
lfd fp13,FPR_PARMS+96(r1)
/* Unwind the stack frame, and jump. */
ld r31,584(r1)
ld r30,576(r1)
addi r1,r1,FRAME_SIZE
bctr
L(do_pltexit):
la r10,(VR_PARMS+0)(r1)
la r9,(VR_PARMS+16)(r1)
beq L(restoreFXR2)
li r11,32
li r12,64
lvx v2,0,r10
lvx v3,0,r9
lvx v4,r11,r10
lvx v5,r11,r9
addi r11,r11,64
lvx v6,r12,r10
lvx v7,r12,r9
addi r12,r12,64
lvx v8,r11,r10
lvx v9,r11,r9
addi r11,r11,64
lvx v10,r12,r10
lvx v11,r12,r9
lvx v12,r11,r10
lvx v13,r11,r9
L(restoreFXR2):
ld r0,FRAME_SIZE+16(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 r0,FRAME_SIZE+8(r1)
ld r6,INT_PARMS+24(r1)
ld r5,INT_PARMS+16(r1)
ld r4,INT_PARMS+8(r1)
mtcrf 0xFF,r0
/* Load the target address, toc and static chain reg from the function
descriptor returned by fixup. */
ld r0,0(r3)
std r2,40(r1)
ld r2,8(r3)
ld r11,16(r3)
ld r3,INT_PARMS+0(r1)
mtctr r0
/* Load the floating point registers. */
lfd fp1,FPR_PARMS+0(r1)
lfd fp2,FPR_PARMS+8(r1)
lfd fp3,FPR_PARMS+16(r1)
lfd fp4,FPR_PARMS+24(r1)
lfd fp5,FPR_PARMS+32(r1)
lfd fp6,FPR_PARMS+40(r1)
lfd fp7,FPR_PARMS+48(r1)
lfd fp8,FPR_PARMS+56(r1)
lfd fp9,FPR_PARMS+64(r1)
lfd fp10,FPR_PARMS+72(r1)
lfd fp11,FPR_PARMS+80(r1)
lfd fp12,FPR_PARMS+88(r1)
lfd fp13,FPR_PARMS+96(r1)
/* Call the target function. */
bctrl
ld r2,40(r1)
lwz r12,VR_VRSAVE(r1)
/* But return here and store the return values. */
std r3,INT_RTN(r1)
std r4,INT_RTN+8(r1)
stfd fp1,FPR_PARMS+0(r1)
stfd fp2,FPR_PARMS+8(r1)
cmpdi cr0,r12,0
la r10,VR_RTN(r1)
stfd fp3,FPR_PARMS+16(r1)
stfd fp4,FPR_PARMS+24(r1)
mr r3,r31
mr r4,r30
beq L(callpltexit)
stvx v2,0,r10
L(callpltexit):
addi r5,r1,INT_PARMS
addi r6,r1,INT_RTN
bl JUMPTARGET(_dl_call_pltexit)
#ifndef SHARED
nop
#endif
/* Restore the return values from target function. */
lwz r12,VR_VRSAVE(r1)
ld r3,INT_RTN(r1)
ld r4,INT_RTN+8(r1)
lfd fp1,FPR_PARMS+0(r1)
lfd fp2,FPR_PARMS+8(r1)
cmpdi cr0,r12,0
la r10,VR_RTN(r1)
lfd fp3,FPR_PARMS+16(r1)
lfd fp4,FPR_PARMS+24(r1)
beq L(pltexitreturn)
lvx v2,0,r10
L(pltexitreturn):
ld r0,FRAME_SIZE+16(r1)
ld r31,584(r1)
ld r30,576(r1)
mtlr r0
ld r1,0(r1)
blr
END(_dl_profile_resolve)
#endif
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