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systemtap/systemtap-1.1-cfi-cfa_ops-fixes.patch
Mark Wielaard be4079e3f2 - Add systemtap-1.1-cfi-cfa_ops-fixes.patch 
- Resolves RHBZ #564429
2010-02-15 15:12:10 +00:00

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commit 08d1d520616557f6ff7dd023e260ad6577e9e0e8
Author: Mark Wielaard <mjw@redhat.com>
Date: Mon Jan 18 09:13:30 2010 +0100
PR11173 Markers get a bad address in prelinked libraries.
Our literal_addr_to_sym_addr() function was just wrong. To compensate for
raw addresses read from elf (either given by the user or through a mark
transformation) we need to know what the elf_bias is (as returned by
dwfl_module_getelf) before feeding them to any libdwfl functions.
* tapsets.cxx (query_module_dwarf): Always add elf_bias to raw function or
statement addresses before calling query_addr().
(query_addr): Don't call literal_addr_to_sym_addr().
* dwflpp.h (literal_addr_to_sym_addr): Removed.
* dwflpp.cxx (literal_addr_to_sym_addr): Likewise.
diff --git a/dwflpp.cxx b/dwflpp.cxx
index 7dd31d0..e6fe017 100644
--- a/dwflpp.cxx
+++ b/dwflpp.cxx
@@ -2771,45 +2771,6 @@ dwflpp::relocate_address(Dwarf_Addr dw_addr, string& reloc_section)
return reloc_addr;
}
-/* Converts a "global" literal address to the module symbol address
- * space. If necessary (not for kernel and executables using absolute
- * addresses), this adjust the address for the current module symbol
- * bias. Literal addresses are provided by the user (or contained on
- * the .probes section) based on the "on disk" layout of the module.
- */
-Dwarf_Addr
-dwflpp::literal_addr_to_sym_addr(Dwarf_Addr lit_addr)
-{
- if (sess.verbose > 2)
- clog << "literal_addr_to_sym_addr 0x" << hex << lit_addr << dec << endl;
-
- // Assume the address came from the symbol list.
- // If we cannot get the symbol bias fall back on the dw bias.
- // The kernel (and other absolute executable modules) is special though.
- if (module_name != TOK_KERNEL
- && dwfl_module_relocations (module) > 0)
- {
- Dwarf_Addr symbias = ~0;
- if (dwfl_module_getsymtab (module) != -1)
- dwfl_module_info (module, NULL, NULL, NULL, NULL,
- &symbias, NULL, NULL);
-
- if (sess.verbose > 3)
- clog << "symbias 0x" << hex << symbias << dec
- << ", dwbias 0x" << hex << module_bias << dec << endl;
-
- if (symbias == (Dwarf_Addr) ~0)
- symbias = module_bias;
-
- lit_addr += symbias;
- }
-
- if (sess.verbose > 2)
- clog << "literal_addr_to_sym_addr ret 0x" << hex << lit_addr << dec << endl;
-
- return lit_addr;
-}
-
/* Returns the call frame address operations for the given program counter
* in the libdw address space.
*/
diff --git a/dwflpp.h b/dwflpp.h
index cdc6ad9..523dd88 100644
--- a/dwflpp.h
+++ b/dwflpp.h
@@ -284,8 +284,6 @@ struct dwflpp
Dwarf_Addr relocate_address(Dwarf_Addr addr, std::string& reloc_section);
- Dwarf_Addr literal_addr_to_sym_addr(Dwarf_Addr lit_addr);
-
private:
DwflPtr dwfl_ptr;
diff --git a/tapsets.cxx b/tapsets.cxx
index 071f92d..d5c6b25 100644
--- a/tapsets.cxx
+++ b/tapsets.cxx
@@ -761,6 +761,13 @@ dwarf_query::query_module_dwarf()
// number plus the module's bias.
Dwarf_Addr addr = has_function_num ?
function_num_val : statement_num_val;
+
+ // These are raw addresses, we need to know what the elf_bias
+ // is to feed it to libdwfl based functions.
+ Dwarf_Addr elf_bias;
+ Elf *elf = dwfl_module_getelf (dw.module, &elf_bias);
+ assert(elf);
+ addr += elf_bias;
query_addr(addr, this);
}
else
@@ -1168,8 +1175,8 @@ query_addr(Dwarf_Addr addr, dwarf_query *q)
{
dwflpp &dw = q->dw;
- // Translate to and actual sumbol address.
- addr = dw.literal_addr_to_sym_addr(addr);
+ if (q->sess.verbose > 2)
+ clog << "query_addr 0x" << hex << addr << dec << endl;
// First pick which CU contains this address
Dwarf_Die* cudie = dw.query_cu_containing_address(addr);
commit 87748e2b87e574d3c83866ccd0d83678c3c68d93
Author: Mark Wielaard <mjw@redhat.com>
Date: Tue Feb 2 13:47:19 2010 +0100
Make sure cfa_ops are always retrieved through dwfl global address.
dwflpp::translate_location() works on the dw address space, but
get_cfa_ops() starts out with dwfl calls (only dwarf_cfi_addrframe()
needs to be adjusted for bias).
* dwflpp.cxx (translate_location): Pass pc plus module bias through to
get_cfa_ops.
(get_cfa_ops): Adjust for bias when calling dwarf_cfi_addrframe(),
add frame start/end address when found if verbose logging.
* testsuite/systemtap.exelib/lib.stp: Add $foo and $bar variables to
process.function probes.
* testsuite/systemtap.exelib/libmarkunamestack.stp: Likewise.
* testsuite/systemtap.exelib/lib.tcl: Expect correct values for
process.function probe variables.
* testsuite/systemtap.exelib/libmarkunamestack.tcl: Likewise.
diff --git a/dwflpp.cxx b/dwflpp.cxx
index e6fe017..d16411c 100644
--- a/dwflpp.cxx
+++ b/dwflpp.cxx
@@ -1726,9 +1726,10 @@ dwflpp::translate_location(struct obstack *pool,
e->tok);
}
- // pc is relative to current module, which is what get_cfa_ops
- // and c_translate_location expects.
- Dwarf_Op *cfa_ops = get_cfa_ops (pc);
+ // pc is in the dw address space of the current module, which is what
+ // c_translate_location expects. get_cfa_ops wants the global dwfl address.
+ Dwarf_Addr addr = pc + module_bias;
+ Dwarf_Op *cfa_ops = get_cfa_ops (addr);
return c_translate_location (pool, &loc2c_error, this,
&loc2c_emit_address,
1, 0 /* PR9768 */,
@@ -2783,17 +2784,17 @@ dwflpp::get_cfa_ops (Dwarf_Addr pc)
clog << "get_cfa_ops @0x" << hex << pc << dec
<< ", module_start @0x" << hex << module_start << dec << endl;
-#if _ELFUTILS_PREREQ(0,142)
// Try debug_frame first, then fall back on eh_frame.
- size_t cfa_nops;
- Dwarf_Addr bias;
+ size_t cfa_nops = 0;
+ Dwarf_Addr bias = 0;
+ Dwarf_Frame *frame = NULL;
+#if _ELFUTILS_PREREQ(0,142)
Dwarf_CFI *cfi = dwfl_module_dwarf_cfi (module, &bias);
if (cfi != NULL)
{
if (sess.verbose > 3)
clog << "got dwarf cfi bias: 0x" << hex << bias << dec << endl;
- Dwarf_Frame *frame = NULL;
- if (dwarf_cfi_addrframe (cfi, pc, &frame) == 0)
+ if (dwarf_cfi_addrframe (cfi, pc - bias, &frame) == 0)
dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops);
else if (sess.verbose > 3)
clog << "dwarf_cfi_addrframe failed: " << dwarf_errmsg(-1) << endl;
@@ -2809,7 +2810,7 @@ dwflpp::get_cfa_ops (Dwarf_Addr pc)
if (sess.verbose > 3)
clog << "got eh cfi bias: 0x" << hex << bias << dec << endl;
Dwarf_Frame *frame = NULL;
- if (dwarf_cfi_addrframe (cfi, pc, &frame) == 0)
+ if (dwarf_cfi_addrframe (cfi, pc - bias, &frame) == 0)
dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops);
else if (sess.verbose > 3)
clog << "dwarf_cfi_addrframe failed: " << dwarf_errmsg(-1) << endl;
@@ -2821,7 +2822,20 @@ dwflpp::get_cfa_ops (Dwarf_Addr pc)
#endif
if (sess.verbose > 2)
- clog << (cfa_ops == NULL ? "not " : " ") << "found cfa" << endl;
+ {
+ if (cfa_ops == NULL)
+ clog << "not found cfa" << endl;
+ else
+ {
+ Dwarf_Addr frame_start, frame_end;
+ bool frame_signalp;
+ int info = dwarf_frame_info (frame, &frame_start, &frame_end,
+ &frame_signalp);
+ clog << "found cfa, info:" << info << " [start: 0x" << hex
+ << frame_start << dec << ", end: 0x" << hex << frame_end
+ << dec << "), nops: " << cfa_nops << endl;
+ }
+ }
return cfa_ops;
}
diff --git a/testsuite/systemtap.exelib/lib.stp b/testsuite/systemtap.exelib/lib.stp
index 0151282..3fdc6db 100644
--- a/testsuite/systemtap.exelib/lib.stp
+++ b/testsuite/systemtap.exelib/lib.stp
@@ -6,7 +6,7 @@ probe process(@1).function("main") {
}
probe process(@1).function("main_func") {
- printf("main_func\n");
+ printf("main_func %d\n", $foo);
}
probe process(@2).function("lib_main") {
@@ -14,5 +14,5 @@ probe process(@2).function("lib_main") {
}
probe process(@2).function("lib_func") {
- printf("lib_func\n");
+ printf("lib_func %d\n", $bar);
}
diff --git a/testsuite/systemtap.exelib/lib.tcl b/testsuite/systemtap.exelib/lib.tcl
index c5b7402..a33290b 100644
--- a/testsuite/systemtap.exelib/lib.tcl
+++ b/testsuite/systemtap.exelib/lib.tcl
@@ -1,11 +1,11 @@
set ::result_string {main
-main_func
-main_func
-main_func
+main_func 3
+main_func 2
+main_func 1
lib_main
-lib_func
-lib_func
-lib_func}
+lib_func 3
+lib_func 2
+lib_func 1}
# Only run on make installcheck
if {! [installtest_p]} { untested "lib-$testname"; return }
diff --git a/testsuite/systemtap.exelib/libmarkunamestack.stp b/testsuite/systemtap.exelib/libmarkunamestack.stp
index 0efbae0..5ee229d 100644
--- a/testsuite/systemtap.exelib/libmarkunamestack.stp
+++ b/testsuite/systemtap.exelib/libmarkunamestack.stp
@@ -7,7 +7,7 @@ probe process(@1).function("main") {
}
probe process(@1).function("main_func") {
- printf("main_func\n");
+ printf("main_func: %d\n", $foo);
}
probe process(@2).function("lib_main") {
@@ -15,7 +15,7 @@ probe process(@2).function("lib_main") {
}
probe process(@2).function("lib_func") {
- printf("lib_func\n");
+ printf("lib_func: %d\n", $bar);
}
#mark
diff --git a/testsuite/systemtap.exelib/libmarkunamestack.tcl b/testsuite/systemtap.exelib/libmarkunamestack.tcl
index 55dc10e..20111b3 100644
--- a/testsuite/systemtap.exelib/libmarkunamestack.tcl
+++ b/testsuite/systemtap.exelib/libmarkunamestack.tcl
@@ -47,9 +47,9 @@ expect {
# lib
-re {^main\r\n} {incr lib; exp_continue}
- -re {^main_func\r\n} {incr lib; exp_continue}
+ -re {^main_func: [1-3]\r\n} {incr lib; exp_continue}
-re {^lib_main\r\n} {incr lib; exp_continue}
- -re {^lib_func\r\n} {incr lib; exp_continue}
+ -re {^lib_func: [1-3]\r\n} {incr lib; exp_continue}
# mark
-re {^main_count: [1-3]\r\n} {incr mark; exp_continue}
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