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268 lines
8.3 KiB
ArmAsm
268 lines
8.3 KiB
ArmAsm
/* RISC-V PLT trampoline
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/asm.h>
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#include "dl-link.h"
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/* Assembler veneer called from the PLT header code for lazy loading.
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The PLT header passes its own args in t0-t2. */
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#ifdef __riscv_float_abi_soft
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# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
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#else
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# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
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#endif
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ENTRY (_dl_runtime_resolve)
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# Save arguments to stack.
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addi sp, sp, -FRAME_SIZE
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REG_S ra, 9*SZREG(sp)
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REG_S a0, 1*SZREG(sp)
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REG_S a1, 2*SZREG(sp)
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REG_S a2, 3*SZREG(sp)
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REG_S a3, 4*SZREG(sp)
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REG_S a4, 5*SZREG(sp)
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REG_S a5, 6*SZREG(sp)
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REG_S a6, 7*SZREG(sp)
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REG_S a7, 8*SZREG(sp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, (10*SZREG + 0*SZFREG)(sp)
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FREG_S fa1, (10*SZREG + 1*SZFREG)(sp)
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FREG_S fa2, (10*SZREG + 2*SZFREG)(sp)
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FREG_S fa3, (10*SZREG + 3*SZFREG)(sp)
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FREG_S fa4, (10*SZREG + 4*SZFREG)(sp)
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FREG_S fa5, (10*SZREG + 5*SZFREG)(sp)
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FREG_S fa6, (10*SZREG + 6*SZFREG)(sp)
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FREG_S fa7, (10*SZREG + 7*SZFREG)(sp)
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#endif
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# Update .got.plt and obtain runtime address of callee.
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slli a1, t1, 1
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mv a0, t0 # link map
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add a1, a1, t1 # reloc offset (== thrice the .got.plt offset)
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la a2, _dl_fixup
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jalr a2
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mv t1, a0
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# Restore arguments from stack.
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REG_L ra, 9*SZREG(sp)
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REG_L a0, 1*SZREG(sp)
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REG_L a1, 2*SZREG(sp)
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REG_L a2, 3*SZREG(sp)
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REG_L a3, 4*SZREG(sp)
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REG_L a4, 5*SZREG(sp)
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REG_L a5, 6*SZREG(sp)
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REG_L a6, 7*SZREG(sp)
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REG_L a7, 8*SZREG(sp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, (10*SZREG + 0*SZFREG)(sp)
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FREG_L fa1, (10*SZREG + 1*SZFREG)(sp)
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FREG_L fa2, (10*SZREG + 2*SZFREG)(sp)
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FREG_L fa3, (10*SZREG + 3*SZFREG)(sp)
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FREG_L fa4, (10*SZREG + 4*SZFREG)(sp)
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FREG_L fa5, (10*SZREG + 5*SZFREG)(sp)
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FREG_L fa6, (10*SZREG + 6*SZFREG)(sp)
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FREG_L fa7, (10*SZREG + 7*SZFREG)(sp)
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#endif
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addi sp, sp, FRAME_SIZE
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# Invoke the callee.
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jr t1
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END (_dl_runtime_resolve)
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#if !defined PROF && defined SHARED
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ENTRY (_dl_runtime_profile)
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/* RISC-V we get called with:
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t0 linkr_map pointer
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t1 the scaled offset stored in t0, which can be used
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to calculate the offset of the current symbol in .rela.plt
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t2 %hi(%pcrel(.got.plt)) stored in t2, no use in this function
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t3 dl resolver entry point, no use in this function
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Stack frame layout with hard float:
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RV64 RV32
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[sp, #96] [sp, #48] La_riscv_regs
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[sp, #48] [sp, #24] La_riscv_retval
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[sp, #40] [sp, #20] frame size return from pltenter
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[sp, #32] [sp, #16] dl_profile_call saved a1
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[sp, #24] [sp, #12] dl_profile_call saved a0
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[sp, #16] [sp, #8] T1
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[sp, #0] [sp, #0] ra, fp <- fp
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*/
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# define OFFSET_T1 2*SZREG
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# define OFFSET_SAVED_CALL_A0 OFFSET_T1 + SZREG
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# define OFFSET_SAVED_CALL_A1 OFFSET_SAVED_CALL_A0 + SZREG
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# define OFFSET_FS OFFSET_SAVED_CALL_A1 + SZREG
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# define OFFSET_RV OFFSET_FS + SZREG
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# define OFFSET_RG OFFSET_RV + DL_SIZEOF_RV
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# define SF_SIZE (-(-(OFFSET_RG + DL_SIZEOF_RG) & ALMASK))
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# Save arguments to stack.
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add sp, sp, -SF_SIZE
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REG_S ra, 0(sp)
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REG_S fp, SZREG(sp)
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mv fp, sp
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REG_S a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_S a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_S a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_S a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_S a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_S a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_S a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_S a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_S fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_S fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_S fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_S fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_S fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_S fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_S fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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# Update .got.plt and obtain runtime address of callee.
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slli a1, t1, 1
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mv a0, t0
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add a1, a1, t1 # link map
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mv a2, ra # return addr
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addi a3, fp, OFFSET_RG # La_riscv_regs pointer
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addi a4, fp, OFFSET_FS # frame size return from pltenter
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REG_S a0, OFFSET_SAVED_CALL_A0(fp)
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REG_S a1, OFFSET_SAVED_CALL_A1(fp)
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la t2, _dl_profile_fixup
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jalr t2
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REG_L t3, OFFSET_FS(fp)
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bgez t3, 1f
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# Save the return.
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mv t4, a0
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# Restore arguments from stack.
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REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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REG_L ra, 0(fp)
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REG_L fp, SZREG(fp)
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addi sp, sp, SF_SIZE
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jr t4
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1:
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# The new frame size is in t3.
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sub sp, fp, t3
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andi sp, sp, ALMASK
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REG_S a0, OFFSET_T1(fp)
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mv a0, sp
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addi a1, fp, SF_SIZE
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mv a2, t3
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la t4, memcpy
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jalr t4
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REG_L t4, OFFSET_T1(fp)
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# Call the function.
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REG_L a0, OFFSET_RG + DL_OFFSET_RG_A0 + 0*SZREG(fp)
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REG_L a1, OFFSET_RG + DL_OFFSET_RG_A0 + 1*SZREG(fp)
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REG_L a2, OFFSET_RG + DL_OFFSET_RG_A0 + 2*SZREG(fp)
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REG_L a3, OFFSET_RG + DL_OFFSET_RG_A0 + 3*SZREG(fp)
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REG_L a4, OFFSET_RG + DL_OFFSET_RG_A0 + 4*SZREG(fp)
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REG_L a5, OFFSET_RG + DL_OFFSET_RG_A0 + 5*SZREG(fp)
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REG_L a6, OFFSET_RG + DL_OFFSET_RG_A0 + 6*SZREG(fp)
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REG_L a7, OFFSET_RG + DL_OFFSET_RG_A0 + 7*SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RG + DL_OFFSET_RG_FA0 + 0*SZFREG(fp)
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FREG_L fa1, OFFSET_RG + DL_OFFSET_RG_FA0 + 1*SZFREG(fp)
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FREG_L fa2, OFFSET_RG + DL_OFFSET_RG_FA0 + 2*SZFREG(fp)
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FREG_L fa3, OFFSET_RG + DL_OFFSET_RG_FA0 + 3*SZFREG(fp)
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FREG_L fa4, OFFSET_RG + DL_OFFSET_RG_FA0 + 4*SZFREG(fp)
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FREG_L fa5, OFFSET_RG + DL_OFFSET_RG_FA0 + 5*SZFREG(fp)
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FREG_L fa6, OFFSET_RG + DL_OFFSET_RG_FA0 + 6*SZFREG(fp)
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FREG_L fa7, OFFSET_RG + DL_OFFSET_RG_FA0 + 7*SZFREG(fp)
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#endif
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jalr t4
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REG_S a0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0(fp)
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REG_S a1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_A0 + SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0(fp)
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FREG_S fa1, OFFSET_SAVED_CALL_A0 + DL_OFFSET_RV_FA0 + SZFREG(fp)
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#endif
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# Setup call to pltexit.
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REG_L a0, OFFSET_SAVED_CALL_A0(fp)
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REG_L a1, OFFSET_SAVED_CALL_A0 + SZREG(fp)
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addi a2, fp, OFFSET_RG
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addi a3, fp, OFFSET_RV
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la t4, _dl_audit_pltexit
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jalr t4
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REG_L a0, OFFSET_RV + DL_OFFSET_RV_A0(fp)
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REG_L a1, OFFSET_RV + DL_OFFSET_RV_A0 + SZREG(fp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, OFFSET_RV + DL_OFFSET_RV_FA0(fp)
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FREG_L fa1, OFFSET_RV + DL_OFFSET_RV_FA0 + SZFREG(fp)
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#endif
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# RA from within La_riscv_reg.
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REG_L ra, OFFSET_RG + DL_OFFSET_RG_RA(fp)
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mv sp, fp
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ADDI sp, sp, SF_SIZE
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REG_S fp, SZREG(fp)
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jr ra
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END (_dl_runtime_profile)
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#endif /* SHARED */
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