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Diffstat (limited to 'sysdeps/aarch64/dl-trampoline.S')
| -rw-r--r-- | sysdeps/aarch64/dl-trampoline.S | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-trampoline.S b/sysdeps/aarch64/dl-trampoline.S new file mode 100644 index 0000000000..2037f18276 --- /dev/null +++ b/sysdeps/aarch64/dl-trampoline.S @@ -0,0 +1,296 @@ +/* Copyright (C) 2005-2014 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 <libc-symbols.h> + +#include "dl-link.h" + +#define ip0 x16 +#define ip1 x17 +#define lr x30 + + .text + .globl _dl_runtime_resolve + .type _dl_runtime_resolve, #function + cfi_startproc + .align 2 +_dl_runtime_resolve: + /* AArch64 we get called with: + ip0 &PLTGOT[2] + ip1 temp(dl resolver entry point) + [sp, #8] lr + [sp, #0] &PLTGOT[n] + */ + + cfi_rel_offset (lr, 8) + + /* Save arguments. */ + stp x8, x9, [sp, #-(80+8*16)]! + cfi_adjust_cfa_offset (80+8*16) + cfi_rel_offset (x8, 0) + cfi_rel_offset (x9, 8) + + stp x6, x7, [sp, #16] + cfi_rel_offset (x6, 16) + cfi_rel_offset (x7, 24) + + stp x4, x5, [sp, #32] + cfi_rel_offset (x4, 32) + cfi_rel_offset (x5, 40) + + stp x2, x3, [sp, #48] + cfi_rel_offset (x2, 48) + cfi_rel_offset (x3, 56) + + stp x0, x1, [sp, #64] + cfi_rel_offset (x0, 64) + cfi_rel_offset (x1, 72) + + stp q0, q1, [sp, #(80+0*16)] + cfi_rel_offset (q0, 80+0*16) + cfi_rel_offset (q1, 80+1*16) + + stp q2, q3, [sp, #(80+2*16)] + cfi_rel_offset (q0, 80+2*16) + cfi_rel_offset (q1, 80+3*16) + + stp q4, q5, [sp, #(80+4*16)] + cfi_rel_offset (q0, 80+4*16) + cfi_rel_offset (q1, 80+5*16) + + stp q6, q7, [sp, #(80+6*16)] + cfi_rel_offset (q0, 80+6*16) + cfi_rel_offset (q1, 80+7*16) + + /* Get pointer to linker struct. */ + ldr x0, [ip0, #-8] + + /* Prepare to call _dl_fixup(). */ + ldr x1, [sp, 80+8*16] /* Recover &PLTGOT[n] */ + + sub x1, x1, ip0 + add x1, x1, x1, lsl #1 + lsl x1, x1, #3 + sub x1, x1, #192 + lsr x1, x1, #3 + + /* Call fixup routine. */ + bl _dl_fixup + + /* Save the return. */ + mov ip0, x0 + + /* Get arguments and return address back. */ + ldp q0, q1, [sp, #(80+0*16)] + ldp q2, q3, [sp, #(80+2*16)] + ldp q4, q5, [sp, #(80+4*16)] + ldp q6, q7, [sp, #(80+6*16)] + ldp x0, x1, [sp, #64] + ldp x2, x3, [sp, #48] + ldp x4, x5, [sp, #32] + ldp x6, x7, [sp, #16] + ldp x8, x9, [sp], #(80+8*16) + cfi_adjust_cfa_offset (-(80+8*16)) + + ldp ip1, lr, [sp], #16 + cfi_adjust_cfa_offset (-16) + + /* Jump to the newly found address. */ + br ip0 + + cfi_endproc + .size _dl_runtime_resolve, .-_dl_runtime_resolve +#ifndef PROF + .globl _dl_runtime_profile + .type _dl_runtime_profile, #function + cfi_startproc + .align 2 +_dl_runtime_profile: + /* AArch64 we get called with: + ip0 &PLTGOT[2] + ip1 temp(dl resolver entry point) + [sp, #8] lr + [sp, #0] &PLTGOT[n] + + Stack frame layout: + [sp, #...] lr + [sp, #...] &PLTGOT[n] + [sp, #96] La_aarch64_regs + [sp, #48] La_aarch64_retval + [sp, #40] frame size return from pltenter + [sp, #32] dl_profile_call saved x1 + [sp, #24] dl_profile_call saved x0 + [sp, #16] t1 + [sp, #0] x29, lr <- x29 + */ + +# define OFFSET_T1 16 +# define OFFSET_SAVED_CALL_X0 OFFSET_T1 + 8 +# define OFFSET_FS OFFSET_SAVED_CALL_X0 + 16 +# define OFFSET_RV OFFSET_FS + 8 +# define OFFSET_RG OFFSET_RV + DL_SIZEOF_RV + +# define SF_SIZE OFFSET_RG + DL_SIZEOF_RG + +# define OFFSET_PLTGOTN SF_SIZE +# define OFFSET_LR OFFSET_PLTGOTN + 8 + + /* Save arguments. */ + sub sp, sp, #SF_SIZE + cfi_adjust_cfa_offset (SF_SIZE) + stp x29, x30, [SP, #0] + mov x29, sp + cfi_def_cfa_register (x29) + cfi_rel_offset (x29, 0) + cfi_rel_offset (lr, 8) + + stp x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0] + cfi_rel_offset (x0, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 0) + cfi_rel_offset (x1, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 8) + stp x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1] + cfi_rel_offset (x2, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 0) + cfi_rel_offset (x3, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 8) + stp x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2] + cfi_rel_offset (x4, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 0) + cfi_rel_offset (x5, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 8) + stp x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3] + cfi_rel_offset (x6, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 0) + cfi_rel_offset (x7, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 8) + + stp d0, d1, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0] + cfi_rel_offset (d0, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0) + cfi_rel_offset (d1, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0 + 8) + stp d2, d3, [X29, #OFFSET_RG+ DL_OFFSET_RG_D0 + 16*1] + cfi_rel_offset (d2, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 0) + cfi_rel_offset (d3, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 8) + stp d4, d5, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2] + cfi_rel_offset (d4, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 0) + cfi_rel_offset (d5, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 8) + stp d6, d7, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3] + cfi_rel_offset (d6, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 0) + cfi_rel_offset (d7, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 8) + + add x0, x29, #SF_SIZE + 16 + ldr x1, [x29, #OFFSET_LR] + stp x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_SP] + + /* Get pointer to linker struct. */ + ldr x0, [ip0, #-8] + + /* Prepare to call _dl_profile_fixup(). */ + ldr x1, [x29, OFFSET_PLTGOTN] /* Recover &PLTGOT[n] */ + + sub x1, x1, ip0 + add x1, x1, x1, lsl #1 + lsl x1, x1, #3 + sub x1, x1, #192 + lsr x1, x1, #3 + + stp x0, x1, [x29, #OFFSET_SAVED_CALL_X0] + + /* Set up extra args for _dl_profile_fixup */ + ldr x2, [x29, #OFFSET_LR] /* load saved LR */ + add x3, x29, #OFFSET_RG /* address of La_aarch64_reg */ + add x4, x29, #OFFSET_FS /* address of framesize */ + bl _dl_profile_fixup + + ldr ip0, [x29, #OFFSET_FS] /* framesize == 0 */ + cmp ip0, #0 + bge 1f + cfi_remember_state + + /* Save the return. */ + mov ip0, x0 + + /* Get arguments and return address back. */ + ldp x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0] + ldp x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1] + ldp x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2] + ldp x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3] + ldp d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0] + ldp d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1] + ldp d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2] + ldp d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3] + + cfi_def_cfa_register (sp) + ldp x29, x30, [x29, #0] + cfi_restore(x29) + cfi_restore(x30) + + add sp, sp, SF_SIZE + 16 + cfi_adjust_cfa_offset (- SF_SIZE - 16) + + /* Jump to the newly found address. */ + br ip0 + + cfi_restore_state +1: + /* The new frame size is in ip0. */ + + sub x1, x29, ip0 + and sp, x1, #0xfffffffffffffff0 + + str x0, [x29, #OFFSET_T1] + + mov x0, sp + add x1, x29, #SF_SIZE + 16 + mov x2, ip0 + bl memcpy + + ldr ip0, [x29, #OFFSET_T1] + + /* Call the function. */ + ldp x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0] + ldp x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1] + ldp x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2] + ldp x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3] + ldp d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0] + ldp d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1] + ldp d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2] + ldp d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3] + blr ip0 + stp x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0] + stp d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0] + stp d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1] + + /* Setup call to pltexit */ + ldp x0, x1, [x29, #OFFSET_SAVED_CALL_X0] + add x2, x29, #OFFSET_RG + add x3, x29, #OFFSET_RV + bl _dl_call_pltexit + + ldp x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0] + ldp d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0] + ldp d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1] + /* LR from within La_aarch64_reg */ + ldr lr, [x29, #OFFSET_RG + DL_OFFSET_RG_LR] + cfi_restore(lr) + mov sp, x29 + cfi_def_cfa_register (sp) + ldr x29, [x29, #0] + cfi_restore(x29) + add sp, sp, SF_SIZE + 16 + cfi_adjust_cfa_offset (- SF_SIZE - 16) + + br lr + + cfi_endproc + .size _dl_runtime_profile, .-_dl_runtime_profile +#endif + .previous |