derek.holloway
7502bf64a4
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85 lines
2.1 KiB
Smarty
Vendored
85 lines
2.1 KiB
Smarty
Vendored
/*
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* Copyright 2022-2024 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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.set noreorder
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.cpload $$25
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.set nomacro
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.set noat
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// Slow path which calls dlsym, taken only on first call.
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// Registers are saved acc. to "Procedure Call Standard for the MIPS Architecture".
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// For DWARF directives, read https://www.imperialviolet.org/2017/01/18/cfi.html.
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// TODO: push two regs at once here and in trampoline to avoid temporarily unaligned stack
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#define PUSH_REG(reg) addiu $$sp, $$sp, -4; .cfi_adjust_cfa_offset 4; sw reg, 4($$sp); .cfi_rel_offset reg, 0
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#define POP_REG(reg) addiu $$sp, $$sp, 4; .cfi_adjust_cfa_offset -4; lw reg, 0($$sp); .cfi_restore reg
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// dwarf_num = 32 + reg_num
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#define PUSH_FREG(reg, dwarf_num) addiu $$sp, $$sp, -8; .cfi_adjust_cfa_offset 8; sdc1 reg, 8($$sp); .cfi_rel_offset dwarf_num, 0; .cfi_rel_offset dwarf_num + 1, 4
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#define POP_FREG(reg, dwarf_num) addiu $$sp, $$sp, 8; .cfi_adjust_cfa_offset -8; ldc1 reg, 0($$sp); .cfi_restore dwarf_num; .cfi_restore dwarf_num + 1
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PUSH_REG($$ra)
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PUSH_REG($$a0)
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PUSH_REG($$a1)
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PUSH_REG($$a2)
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PUSH_REG($$a3)
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PUSH_REG($$a3) // For alignment
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PUSH_FREG($$f12, 44)
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PUSH_FREG($$f14, 46)
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// Vector arguments are passed on stack so we don't save vector regs
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move $$a0, $$AT
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lw $$25, %call16(_${lib_suffix}_tramp_resolve)($$gp)
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.reloc 1f, R_MIPS_JALR, _${lib_suffix}_tramp_resolve
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1: jalr $$25
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nop
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POP_FREG($$f14, 46)
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POP_FREG($$f12, 44)
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POP_REG($$a3)
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POP_REG($$a3)
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POP_REG($$a2)
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POP_REG($$a1)
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POP_REG($$a0)
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POP_REG($$ra)
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jr $$ra
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nop
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.set macro
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.set reorder
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.cfi_endproc
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