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| author | John Reiser <jreiser@BitWagon.com> | 2010-10-27 18:59:07 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-10-29 19:08:54 +0100 |
| commit | a2d49358ba9bc93204dc001d5568c5bdb299b77d (patch) | |
| tree | a9f70362c6aba75f56ad4a808473ae961cff957b /scripts/recordmcount.c | |
| parent | 949e51bea342da838be5295628e4a7ada8bae833 (diff) | |
| download | lwn-a2d49358ba9bc93204dc001d5568c5bdb299b77d.tar.gz lwn-a2d49358ba9bc93204dc001d5568c5bdb299b77d.zip | |
ftrace/MIPS: Add MIPS64 support for C version of recordmcount
MIPS64 has 'weird' Elf64_Rel.r_info[1,2], which must be used instead of
the generic Elf64_Rel.r_info, otherwise, the C version of recordmcount
will not work for "segmentation fault".
Usage of "union mips_r_info" and the functions MIPS64_r_sym() and
MIPS64_r_info() written by Maciej W. Rozycki <macro@linux-mips.org>
----
[1] http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
[2] arch/mips/include/asm/module.h
Tested-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: John Reiser <jreiser@BitWagon.com>
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
LKML-Reference: <AANLkTinwXjLAYACUfhLYaocHD_vBbiErLN3NjwN8JqSy@mail.gmail.com>
LKML-Reference: <910dc2d5ae1ed042df4f96815fe4a433078d1c2a.1288176026.git.wuzhangjin@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'scripts/recordmcount.c')
| -rw-r--r-- | scripts/recordmcount.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 26e1271259ba..2d32b9ced20a 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -217,6 +217,39 @@ is_mcounted_section_name(char const *const txtname) #define RECORD_MCOUNT_64 #include "recordmcount.h" +/* 64-bit EM_MIPS has weird ELF64_Rela.r_info. + * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf + * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] + * to imply the order of the members; the spec does not say so. + * typedef unsigned char Elf64_Byte; + * fails on MIPS64 because their <elf.h> already has it! + */ + +typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ + +union mips_r_info { + Elf64_Xword r_info; + struct { + Elf64_Word r_sym; /* Symbol index. */ + myElf64_Byte r_ssym; /* Special symbol. */ + myElf64_Byte r_type3; /* Third relocation. */ + myElf64_Byte r_type2; /* Second relocation. */ + myElf64_Byte r_type; /* First relocation. */ + } r_mips; +}; + +static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) +{ + return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); +} + +static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) +{ + rp->r_info = ((union mips_r_info){ + .r_mips = { .r_sym = w(sym), .r_type = type } + }).r_info; +} + static void do_file(char const *const fname) { @@ -268,6 +301,7 @@ do_file(char const *const fname) case EM_386: reltype = R_386_32; break; case EM_ARM: reltype = R_ARM_ABS32; break; case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break; + case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break; case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break; case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break; case EM_S390: /* reltype: e_class */ gpfx = '_'; break; @@ -291,6 +325,8 @@ do_file(char const *const fname) } if (EM_S390 == w2(ehdr->e_machine)) reltype = R_390_32; + if (EM_MIPS == w2(ehdr->e_machine)) + reltype = R_MIPS_32; do32(ehdr, fname, reltype); } break; case ELFCLASS64: { @@ -303,6 +339,11 @@ do_file(char const *const fname) } if (EM_S390 == w2(ghdr->e_machine)) reltype = R_390_64; + if (EM_MIPS == w2(ghdr->e_machine)) { + reltype = R_MIPS_64; + Elf64_r_sym = MIPS64_r_sym; + Elf64_r_info = MIPS64_r_info; + } do64(ghdr, fname, reltype); } break; } /* end switch */ |