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nvgpu: posix: Add support for backtrace

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Add support for backtrace prints when BUG() is being called.
To support backtrace calls, the -rdynamic compiler flag is
now being used. On host, it fully works as expected, on
target only exported symbols (in libnvgpu-drv.export) are
visible.

JIRA NVGPU-1246

Change-Id: Ia075ac99228e8377bdb3142fef2e56c2fea2d967
Signed-off-by: Nicolas Benech <nbenech@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1943478
Reviewed-by: svc-misra-checker <svc-misra-checker@nvidia.com>
Reviewed-by: Philip Elcan <pelcan@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Nicolas Benech
2018-11-05 14:10:23 -05:00
committed by mobile promotions
parent 3e6779d554
commit 5b5a1cb014
4 changed files with 26 additions and 4 deletions
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1
drivers/gpu/nvgpu/Makefile.tmk
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@@ -50,6 +50,7 @@ ifneq ($(NV_BUILD_CONFIGURATION_OS_IS_QNX),1)
NV_COMPONENT_SYSTEM_SHARED_LIBRARIES += pthread
endif
NV_COMPONENT_CFLAGS += -D__NVGPU_POSIX__
_NV_TOOLCHAIN_CFLAGS += -rdynamic -g
NV_COMPONENT_SYSTEMIMAGE_DIR := $(NV_SYSTEMIMAGE_TEST_EXECUTABLE_DIR)/nvgpu_unit
systemimage:: $(NV_COMPONENT_SYSTEMIMAGE_DIR)

26
drivers/gpu/nvgpu/os/posix/bug.c
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@@ -26,6 +26,11 @@
#include <pthread.h>
#include <stdbool.h>
#include <setjmp.h>
#ifndef _QNX_SOURCE
#include <execinfo.h>
#endif
#define BACKTRACE_MAXSIZE 1024
static _Thread_local bool expect_bug;
static _Thread_local jmp_buf *jmp_handler;
@@ -42,14 +47,25 @@ void bug_handler_cancel(void)
jmp_handler = NULL;
}
static void __dump_stack(unsigned int skip_frames)
static void __dump_stack(int skip_frames)
{
#ifndef _QNX_SOURCE
void *trace[BACKTRACE_MAXSIZE];
int i;
int trace_size = backtrace(trace, BACKTRACE_MAXSIZE);
char **trace_syms = backtrace_symbols(trace, trace_size);
for (i = skip_frames; i < trace_size; i++) {
nvgpu_err(NULL, "[%d] %s", i - skip_frames, trace_syms[i]);
}
#endif
return;
}
void dump_stack(void)
{
__dump_stack(0);
/* Skip this function and __dump_stack() */
__dump_stack(2);
}
/*
@@ -63,8 +79,12 @@ void __bug(const char *fmt, ...)
/* Perform a long jump to where "setjmp()" was called. */
longjmp(*jmp_handler, 1);
}
/* If BUG is unexpected, raise a SIGSEGV signal and kill the thread */
/*
* If BUG was unexpected, raise a SIGSEGV signal, dump the stack and
* kill the thread.
*/
nvgpu_err(NULL, "BUG detected!");
dump_stack();
(void) raise(SIGSEGV);
pthread_exit(NULL);
}

2
userspace/Makefile
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@@ -97,7 +97,7 @@ $(OUT)/nvgpu_unit: $(OUT)/libnvgpu-drv.so $(CORE_OBJS)
-o $(OUT)/nvgpu_unit $(CORE_OBJS) $(LIB_PATHS) $(LIBS)
$(OUT)/libnvgpu-drv.so: $(OBJS)
$(CC) -shared -o $(OUT)/libnvgpu-drv.so $(OBJS) -lgcov
$(CC) -shared -o $(OUT)/libnvgpu-drv.so $(OBJS) -lgcov -rdynamic
# Default build target for all the nvgpu driver object files we want to build in
# userspace. These get bundled into libnvgpu-drv.so.

1
userspace/Makefile.tmk
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@@ -45,6 +45,7 @@ NV_COMPONENT_SYSTEM_SHARED_LIBRARIES += gcov
endif
NV_COMPONENT_CFLAGS += -D__NVGPU_POSIX__
_NV_TOOLCHAIN_CFLAGS += -rdynamic
NV_UNIT_SH=unit.sh
NV_COMPONENT_SYSTEMIMAGE_DIR := $(NV_SYSTEMIMAGE_TEST_EXECUTABLE_DIR)/nvgpu_unit