/*
* Copyright 2018-2025 Yury Gribov
*
* The MIT License (MIT)
*
* Use of this source code is governed by MIT license that can be
* found in the LICENSE.txt file.
*/
#define lr x30
#define ip0 x16
.section .note.GNU-stack,"",@progbits
.data
.globl _libva_drm_so_tramp_table
.hidden _libva_drm_so_tramp_table
.align 8
_libva_drm_so_tramp_table:
.zero 16
.text
.globl _libva_drm_so_tramp_resolve
.hidden _libva_drm_so_tramp_resolve
.globl _libva_drm_so_save_regs_and_resolve
.hidden _libva_drm_so_save_regs_and_resolve
.type _libva_drm_so_save_regs_and_resolve, %function
_libva_drm_so_save_regs_and_resolve:
.cfi_startproc
// Slow path which calls dlsym, taken only on first call.
// Registers are saved according to "Procedure Call Standard for the Arm® 64-bit Architecture".
// For DWARF directives, read https://www.imperialviolet.org/2017/01/18/cfi.html.
// Stack is aligned at 16 bytes
#define PUSH_PAIR(reg1, reg2) stp reg1, reg2, [sp, #-16]!; .cfi_adjust_cfa_offset 16; .cfi_rel_offset reg1, 0; .cfi_rel_offset reg2, 8
#define POP_PAIR(reg1, reg2) ldp reg1, reg2, [sp], #16; .cfi_adjust_cfa_offset -16; .cfi_restore reg2; .cfi_restore reg1
#define PUSH_WIDE_PAIR(reg1, reg2) stp reg1, reg2, [sp, #-32]!; .cfi_adjust_cfa_offset 32; .cfi_rel_offset reg1, 0; .cfi_rel_offset reg2, 16
#define POP_WIDE_PAIR(reg1, reg2) ldp reg1, reg2, [sp], #32; .cfi_adjust_cfa_offset -32; .cfi_restore reg2; .cfi_restore reg1
// Save only arguments (and lr)
PUSH_PAIR(x0, x1)
PUSH_PAIR(x2, x3)
PUSH_PAIR(x4, x5)
PUSH_PAIR(x6, x7)
PUSH_PAIR(x8, lr)
ldr x0, [sp, #80] // 16*5
PUSH_WIDE_PAIR(q0, q1)
PUSH_WIDE_PAIR(q2, q3)
PUSH_WIDE_PAIR(q4, q5)
PUSH_WIDE_PAIR(q6, q7)
// Stack is aligned at 16 bytes
bl _libva_drm_so_tramp_resolve
mov ip0, x0
// TODO: pop pc?
POP_WIDE_PAIR(q6, q7)
POP_WIDE_PAIR(q4, q5)
POP_WIDE_PAIR(q2, q3)
POP_WIDE_PAIR(q0, q1)
POP_PAIR(x8, lr)
POP_PAIR(x6, x7)
POP_PAIR(x4, x5)
POP_PAIR(x2, x3)
POP_PAIR(x0, x1)
br lr
.cfi_endproc
/*
* Copyright 2018-2025 Yury Gribov
*
* The MIT License (MIT)
*
* Use of this source code is governed by MIT license that can be
* found in the LICENSE.txt file.
*/
.globl vaGetDisplayDRM
.p2align 4
.type vaGetDisplayDRM, %function
#ifndef IMPLIB_EXPORT_SHIMS
.hidden vaGetDisplayDRM
#endif
vaGetDisplayDRM:
.cfi_startproc
1:
// Load address
// TODO: can we do this faster on newer ARMs?
adrp ip0, _libva_drm_so_tramp_table+0
ldr ip0, [ip0, #:lo12:_libva_drm_so_tramp_table+0]
cbz ip0, 2f
// Fast path
br ip0
2:
// Slow path
mov ip0, 0 & 0xffff
#if 0 > 0xffff
movk ip0, 0 >> 16, lsl #16
#endif
stp ip0, lr, [sp, #-16]!; .cfi_adjust_cfa_offset 16; .cfi_rel_offset lr, 8
bl _libva_drm_so_save_regs_and_resolve
ldp xzr, lr, [sp], #16; .cfi_adjust_cfa_offset -16; .cfi_restore lr
br ip0
.cfi_endproc