From 3fb18fd80c5900cc82748f3320b30516c57d24da Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Sat, 29 Jan 2022 10:56:45 -0800 Subject: elf: Add Add to get the adddress of the r_debug structure after relocation and its offset before relocation from the PT_DYNAMIC segment to support DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP. Co-developed-by: Xi Ruoyao --- sysdeps/mips/dl-r_debug.h | 64 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 sysdeps/mips/dl-r_debug.h (limited to 'sysdeps/mips') diff --git a/sysdeps/mips/dl-r_debug.h b/sysdeps/mips/dl-r_debug.h new file mode 100644 index 0000000..edd83d4 --- /dev/null +++ b/sysdeps/mips/dl-r_debug.h @@ -0,0 +1,64 @@ +/* Function to access r_debug structure. MIPS specific version. + Copyright (C) 2022 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 + . */ + +#ifdef EW_ +/* Return the offset of the struct r_debug before relocation. */ + +static inline EW(Addr) +E(r_debug_offset) (EW(Dyn) *d, int fd, EW(Addr) offset) +{ + switch (d->d_tag) + { + case DT_MIPS_RLD_MAP_REL: + offset += d->d_un.d_val; + break; + case DT_MIPS_RLD_MAP: + offset = d->d_un.d_ptr; + break; + default: + return 0; + } + + if (pread (fd, &offset, sizeof (offset), offset) != sizeof (offset)) + return 0; + + return offset; +} +#else +/* Return the address of the struct r_debug after relocation. */ + +static inline EW(Addr) +E(r_debug_address) (EW(Dyn) *d) +{ + EW(Addr) ptr; + + switch (d->d_tag) + { + case DT_MIPS_RLD_MAP_REL: + ptr = ((EW(Addr)) d) + d->d_un.d_val; + break; + case DT_MIPS_RLD_MAP: + ptr = d->d_un.d_ptr; + break; + default: + return 0; + } + + return *(EW(Addr) *) ptr; +} +#endif -- cgit v1.1