objtool: Support per-function rodata sections

Add support for processing switch jump tables in objects with multiple
.rodata sections, such as those created by '-ffunction-sections' and
'-fdata-sections'.  Currently, objtool always looks in .rodata for jump
table information, which results in many "sibling call from callable
instruction with modified stack frame" warnings with objects compiled
using those flags.

The fix is comprised of three parts:

1. Flagging all .rodata sections when importing ELF information for
   easier checking later.

2. Keeping a reference to the section each relocation is from in order
   to get the list_head for the other relocations in that section.

3. Finding jump tables by following relocations to .rodata sections,
   rather than always referencing a single global .rodata section.

The patch has been tested without data sections enabled and no
differences in the resulting orc unwind information were seen.

Note that as objtool adds terminators to end of each .text section the
unwind information generated between a function+data sections build and
a normal build aren't directly comparable. Manual inspection suggests
that objtool is now generating the correct information, or at least
making more of an effort to do so than it did previously.

Signed-off-by: Allan Xavier <allan.x.xavier@oracle.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/099bdc375195c490dda04db777ee0b95d566ded1.1536325914.git.jpoimboe@redhat.com

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2928939b98ec208fee9069cfc3ddf4aea91f01f3..0414a0d522621d4ca973240979e89c07d6cd4f8a 100644 (file)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -836,7 +836,7 @@ static int add_switch_table(struct objtool_file *file, struct instruction *insn,
        struct symbol *pfunc = insn->func->pfunc;
        unsigned int prev_offset = 0;
 
-       list_for_each_entry_from(rela, &file->rodata->rela->rela_list, list) {
+       list_for_each_entry_from(rela, &table->rela_sec->rela_list, list) {
                if (rela == next_table)
                        break;
 
@@ -926,6 +926,7 @@ static struct rela *find_switch_table(struct objtool_file *file,
 {
        struct rela *text_rela, *rodata_rela;
        struct instruction *orig_insn = insn;
+       struct section *rodata_sec;
        unsigned long table_offset;
 
        /*
@@ -953,10 +954,13 @@ static struct rela *find_switch_table(struct objtool_file *file,
                /* look for a relocation which references .rodata */
                text_rela = find_rela_by_dest_range(insn->sec, insn->offset,
                                                    insn->len);
-               if (!text_rela || text_rela->sym != file->rodata->sym)
+               if (!text_rela || text_rela->sym->type != STT_SECTION ||
+                   !text_rela->sym->sec->rodata)
                        continue;
 
                table_offset = text_rela->addend;
+               rodata_sec = text_rela->sym->sec;
+
                if (text_rela->type == R_X86_64_PC32)
                        table_offset += 4;
 
@@ -964,10 +968,10 @@ static struct rela *find_switch_table(struct objtool_file *file,
                 * Make sure the .rodata address isn't associated with a
                 * symbol.  gcc jump tables are anonymous data.
                 */
-               if (find_symbol_containing(file->rodata, table_offset))
+               if (find_symbol_containing(rodata_sec, table_offset))
                        continue;
 
-               rodata_rela = find_rela_by_dest(file->rodata, table_offset);
+               rodata_rela = find_rela_by_dest(rodata_sec, table_offset);
                if (rodata_rela) {
                        /*
                         * Use of RIP-relative switch jumps is quite rare, and
@@ -1052,7 +1056,7 @@ static int add_switch_table_alts(struct objtool_file *file)
        struct symbol *func;
        int ret;
 
-       if (!file->rodata || !file->rodata->rela)
+       if (!file->rodata)
                return 0;
 
        for_each_sec(file, sec) {
@@ -1198,10 +1202,33 @@ static int read_retpoline_hints(struct objtool_file *file)
        return 0;
 }
 
+static void mark_rodata(struct objtool_file *file)
+{
+       struct section *sec;
+       bool found = false;
+
+       /*
+        * This searches for the .rodata section or multiple .rodata.func_name
+        * sections if -fdata-sections is being used. The .str.1.1 and .str.1.8
+        * rodata sections are ignored as they don't contain jump tables.
+        */
+       for_each_sec(file, sec) {
+               if (!strncmp(sec->name, ".rodata", 7) &&
+                   !strstr(sec->name, ".str1.")) {
+                       sec->rodata = true;
+                       found = true;
+               }
+       }
+
+       file->rodata = found;
+}
+
 static int decode_sections(struct objtool_file *file)
 {
        int ret;
 
+       mark_rodata(file);
+
        ret = decode_instructions(file);
        if (ret)
                return ret;
@@ -2171,7 +2198,6 @@ int check(const char *_objname, bool orc)
        INIT_LIST_HEAD(&file.insn_list);
        hash_init(file.insn_hash);
        file.whitelist = find_section_by_name(file.elf, ".discard.func_stack_frame_non_standard");
-       file.rodata = find_section_by_name(file.elf, ".rodata");
        file.c_file = find_section_by_name(file.elf, ".comment");
        file.ignore_unreachables = no_unreachable;
        file.hints = false;

diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index 95700a2bcb7c1ee429c6b2e0270428a5bfb8b54a..e6e8a655b5563e84bcd5d67eee13a446db81cc31 100644 (file)
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -60,8 +60,8 @@ struct objtool_file {
        struct elf *elf;
        struct list_head insn_list;
        DECLARE_HASHTABLE(insn_hash, 16);
-       struct section *rodata, *whitelist;
-       bool ignore_unreachables, c_file, hints;
+       struct section *whitelist;
+       bool ignore_unreachables, c_file, hints, rodata;
 };
 
 int check(const char *objname, bool orc);

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 7ec85d567598c5047fbe00b9660c9e7fc76870cf..f7082de1ee8296cac2a9dc1da1e35e4a56bbd503 100644 (file)
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -379,6 +379,7 @@ static int read_relas(struct elf *elf)
                        rela->offset = rela->rela.r_offset;
                        symndx = GELF_R_SYM(rela->rela.r_info);
                        rela->sym = find_symbol_by_index(elf, symndx);
+                       rela->rela_sec = sec;
                        if (!rela->sym) {
                                WARN("can't find rela entry symbol %d for %s",
                                     symndx, sec->name);

diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h
index de5cd2ddded987bf524be46e446bd1e814422761..bc97ed86b9cd8ebd3fc8e9e1512d8d06b3e96d14 100644 (file)
--- a/tools/objtool/elf.h
+++ b/tools/objtool/elf.h
@@ -48,7 +48,7 @@ struct section {
        char *name;
        int idx;
        unsigned int len;
-       bool changed, text;
+       bool changed, text, rodata;
 };
 
 struct symbol {
@@ -68,6 +68,7 @@ struct rela {
        struct list_head list;
        struct hlist_node hash;
        GElf_Rela rela;
+       struct section *rela_sec;
        struct symbol *sym;
        unsigned int type;
        unsigned long offset;