diff options
| author | Andreas Schwab <schwab@suse.de> | 2018-05-15 13:47:02 +0200 |
|---|---|---|
| committer | Mark Wielaard <mark@klomp.org> | 2018-05-15 16:46:18 +0200 |
| commit | 9279076c5149ce041b3720dac002f176a5cbc3b2 (patch) | |
| tree | 95607b6259d453df4b8c4039b3dab430ffc17ee0 /backends | |
| parent | a392e674beb9585fa90d1080c941ecc06bb65b57 (diff) | |
backends: add checks for _GLOBAL_OFFSET_TABLE_ and __global_pointer$ on riscv
Signed-off-by: Andreas Schwab <schwab@suse.de>
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/ChangeLog | 5 | ||||
| -rw-r--r-- | backends/riscv_init.c | 1 | ||||
| -rw-r--r-- | backends/riscv_symbol.c | 32 |
3 files changed, 38 insertions, 0 deletions
diff --git a/backends/ChangeLog b/backends/ChangeLog index 63bb7e44..0dde0ff3 100644 --- a/backends/ChangeLog +++ b/backends/ChangeLog @@ -1,3 +1,8 @@ +2018-05-15 Andreas Schwab <schwab@suse.de> + + * riscv_init.c (riscv_init): Hook check_special_symbol. + * riscv_symbol.c (riscv_check_special_symbol): New function. + 2018-04-19 Andreas Schwab <schwab@suse.de> * Makefile.am (modules): Add riscv. diff --git a/backends/riscv_init.c b/backends/riscv_init.c index 761d9c2e..80be86d3 100644 --- a/backends/riscv_init.c +++ b/backends/riscv_init.c @@ -51,6 +51,7 @@ riscv_init (Elf *elf __attribute__ ((unused)), eh->name = "RISC-V"; riscv_init_reloc (eh); HOOK (eh, reloc_simple_type); + HOOK (eh, check_special_symbol); HOOK (eh, machine_flag_check); return MODVERSION; diff --git a/backends/riscv_symbol.c b/backends/riscv_symbol.c index 628e0572..dce8e358 100644 --- a/backends/riscv_symbol.c +++ b/backends/riscv_symbol.c @@ -60,3 +60,35 @@ riscv_machine_flag_check (GElf_Word flags) return ((flags &~ (EF_RISCV_RVC | EF_RISCV_FLOAT_ABI)) == 0); } + +/* Check whether given symbol's st_value and st_size are OK despite failing + normal checks. */ +bool +riscv_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr, const GElf_Sym *sym, + const char *name, const GElf_Shdr *destshdr) +{ + if (name == NULL) + return false; + + const char *sname = elf_strptr (elf, ehdr->e_shstrndx, destshdr->sh_name); + if (sname == NULL) + return false; + + /* _GLOBAL_OFFSET_TABLE_ points to the start of the .got section, but it + is preceded by the .got.plt section in the output .got section. */ + if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) + return (strcmp (sname, ".got") == 0 + && sym->st_value >= destshdr->sh_addr + && sym->st_value < destshdr->sh_addr + destshdr->sh_size); + + /* __global_pointer$ points to the .sdata section with an offset of + 0x800. It might however fall in the .got section, in which case we + cannot check the offset. The size always should be zero. */ + if (strcmp (name, "__global_pointer$") == 0) + return (((strcmp (sname, ".sdata") == 0 + && sym->st_value == destshdr->sh_addr + 0x800) + || strcmp (sname, ".got") == 0) + && sym->st_size == 0); + + return false; +} |