derek.holloway
7502bf64a4
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93 lines
2.4 KiB
Smarty
Vendored
93 lines
2.4 KiB
Smarty
Vendored
/*
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* Copyright 2018-2025 Yury Gribov
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*
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* The MIT License (MIT)
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*
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* Use of this source code is governed by MIT license that can be
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* found in the LICENSE.txt file.
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*/
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.section .note.GNU-stack,"",%progbits
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.data
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.globl _${lib_suffix}_tramp_table
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.hidden _${lib_suffix}_tramp_table
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.align 4
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_${lib_suffix}_tramp_table:
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.zero $table_size
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.text
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.globl _${lib_suffix}_tramp_resolve
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.hidden _${lib_suffix}_tramp_resolve
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.globl _${lib_suffix}_save_regs_and_resolve
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.hidden _${lib_suffix}_save_regs_and_resolve
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.type _${lib_suffix}_save_regs_and_resolve, %function
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_${lib_suffix}_save_regs_and_resolve:
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.cfi_startproc
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#define PUSH_REG(reg) push {reg}; .cfi_adjust_cfa_offset 4; .cfi_rel_offset reg, 0
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#define POP_REG(reg) pop {reg} ; .cfi_adjust_cfa_offset -4; .cfi_restore reg
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// Binutils 2.30 does not like q0 in .cfi_rel_offset
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#define PUSH_DREG_PAIR(reg1, reg2) vpush {reg1, reg2}; .cfi_adjust_cfa_offset 16; .cfi_rel_offset reg1, 0; .cfi_rel_offset reg2, 8
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#define POP_DREG_PAIR(reg1, reg2) vpop {reg1, reg2}; .cfi_adjust_cfa_offset -16; .cfi_restore reg1; .cfi_restore reg2
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// Slow path which calls dlsym, taken only on first call.
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// Registers are saved acc. to "Procedure Call Standard for the ARM Architecture".
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// For DWARF directives, read https://www.imperialviolet.org/2017/01/18/cfi.html.
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// Stack is aligned at 16 bytes at this point
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// Save only arguments (and lr)
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PUSH_REG(r0)
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ldr r0, [sp, #8]
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PUSH_REG(r1)
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PUSH_REG(r2)
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PUSH_REG(r3)
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PUSH_REG(lr)
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PUSH_REG(lr) // Align to 8 bytes
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// Arguments can be passed in VFP registers only when hard-float ABI is used
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// for arm-gnueabihf target // (http://android-doc.github.io/ndk/guides/abis.html#v7a).
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// Use compiler macro to detect this case.
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#ifdef __ARM_PCS_VFP
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PUSH_DREG_PAIR(d0, d1)
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PUSH_DREG_PAIR(d2, d3)
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PUSH_DREG_PAIR(d4, d5)
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PUSH_DREG_PAIR(d6, d7)
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PUSH_DREG_PAIR(d8, d9)
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PUSH_DREG_PAIR(d10, d11)
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PUSH_DREG_PAIR(d12, d13)
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PUSH_DREG_PAIR(d14, d15)
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// FIXME: NEON actually supports 32 D-registers but it's unclear how to detect this
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#endif
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bl _${lib_suffix}_tramp_resolve(PLT)
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mov ip, r0
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#ifdef __ARM_PCS_VFP
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POP_DREG_PAIR(d14, d15)
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POP_DREG_PAIR(d12, d13)
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POP_DREG_PAIR(d10, d11)
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POP_DREG_PAIR(d8, d9)
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POP_DREG_PAIR(d6, d7)
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POP_DREG_PAIR(d4, d5)
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POP_DREG_PAIR(d2, d3)
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POP_DREG_PAIR(d0, d1)
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#endif
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POP_REG(lr) // TODO: pop pc?
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POP_REG(lr)
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POP_REG(r3)
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POP_REG(r2)
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POP_REG(r1)
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POP_REG(r0)
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bx lr
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.cfi_endproc
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