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-rw-r--r--libc/ports/sysdeps/aarch64/dl-trampoline.S276
1 files changed, 276 insertions, 0 deletions
diff --git a/libc/ports/sysdeps/aarch64/dl-trampoline.S b/libc/ports/sysdeps/aarch64/dl-trampoline.S
new file mode 100644
index 000000000..77badc77c
--- /dev/null
+++ b/libc/ports/sysdeps/aarch64/dl-trampoline.S
@@ -0,0 +1,276 @@
+/* Copyright (C) 2005-2012 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]!
+ cfi_adjust_cfa_offset (80)
+ 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)
+
+ /* Get pointer to linker struct. */
+ ldr x0, [ip0, #-8]
+
+ /* Prepare to call _dl_fixup(). */
+ ldr x1, [sp, 80] /* 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 x0, x1, [sp, #64]
+ ldp x2, x3, [sp, #48]
+ ldp x4, x5, [sp, #32]
+ ldp x6, x7, [sp, #16]
+ ldp x8, x9, [sp], #80
+ cfi_adjust_cfa_offset (-80)
+
+ 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
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