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| author | H.J. Lu <hjl.tools@gmail.com> | 2022-01-29 10:56:45 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2022-01-31 07:05:48 -0800 |
| commit | 3fb18fd80c5900cc82748f3320b30516c57d24da (patch) | |
| tree | 3b31e62ff66968dc1b17408ceb4a601a0a6eefc5 /elf | |
| parent | 829ea0caca35800c4ffbebced7c3271293811144 (diff) | |
| download | glibc-3fb18fd80c5900cc82748f3320b30516c57d24da.tar.gz glibc-3fb18fd80c5900cc82748f3320b30516c57d24da.tar.xz glibc-3fb18fd80c5900cc82748f3320b30516c57d24da.zip | |
elf: Add <dl-r_debug.h>
Add <dl-r_debug.h> 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 <xry111@mengyan1223.wang>
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/pldd-xx.c | 34 | ||||
| -rw-r--r-- | elf/tst-dlmopen4.c | 15 |
2 files changed, 24 insertions, 25 deletions
diff --git a/elf/pldd-xx.c b/elf/pldd-xx.c index 1cdfb49c53..30513b423f 100644 --- a/elf/pldd-xx.c +++ b/elf/pldd-xx.c @@ -22,6 +22,8 @@ #define EW_(e, w, t) EW__(e, w, _##t) #define EW__(e, w, t) e##w##t +#include <dl-r_debug.h> + struct E(link_map) { EW(Addr) l_addr; @@ -126,21 +128,25 @@ E(find_maps) (const char *exe, int memfd, pid_t pid, void *auxv, != p[i].p_filesz) error (EXIT_FAILURE, 0, gettext ("cannot read dynamic section")); - /* Search for the DT_DEBUG entry. */ + /* Search for the struct r_debug. */ for (unsigned int j = 0; j < p[i].p_filesz / sizeof (EW(Dyn)); ++j) - if (dyn[j].d_tag == DT_DEBUG && dyn[j].d_un.d_ptr != 0) - { - struct E(r_debug) r; - if (pread (memfd, &r, sizeof (r), dyn[j].d_un.d_ptr) - != sizeof (r)) - error (EXIT_FAILURE, 0, gettext ("cannot read r_debug")); - - if (r.r_map != 0) - { - list = r.r_map; - break; - } - } + { + EW(Addr) off = offset + p[i].p_vaddr + sizeof (EW(Dyn)) * j; + off = E(r_debug_offset) (&dyn[j], memfd, off); + if (off != 0) + { + struct E(r_debug) r; + if (pread (memfd, &r, sizeof (r), off) + != sizeof (r)) + error (EXIT_FAILURE, 0, gettext ("cannot read r_debug")); + + if (r.r_map != 0) + { + list = r.r_map; + break; + } + } + } free (dyn); break; diff --git a/elf/tst-dlmopen4.c b/elf/tst-dlmopen4.c index d8bcf7e9d5..8456f89053 100644 --- a/elf/tst-dlmopen4.c +++ b/elf/tst-dlmopen4.c @@ -25,16 +25,9 @@ #include <support/check.h> #include <support/test-driver.h> -#ifndef ELF_MACHINE_GET_R_DEBUG -# define ELF_MACHINE_GET_R_DEBUG(d) \ - (__extension__ ({ \ - struct r_debug_extended *debug; \ - if ((d)->d_tag == DT_DEBUG) \ - debug = (struct r_debug_extended *) (d)->d_un.d_ptr; \ - else \ - debug = NULL; \ - debug; })) -#endif +#define E(x) x +#define EW(x) ElfW(x) +#include <dl-r_debug.h> static int do_test (void) @@ -44,7 +37,7 @@ do_test (void) for (d = _DYNAMIC; d->d_tag != DT_NULL; ++d) { - debug = ELF_MACHINE_GET_R_DEBUG (d); + debug = (struct r_debug_extended *) r_debug_address (d); if (debug != NULL) break; } |