diff options
Diffstat (limited to 'gdb-linux_perf-bundle.patch')
| -rw-r--r-- | gdb-linux_perf-bundle.patch | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/gdb-linux_perf-bundle.patch b/gdb-linux_perf-bundle.patch new file mode 100644 index 0000000..bb6fb6a --- /dev/null +++ b/gdb-linux_perf-bundle.patch @@ -0,0 +1,226 @@ +From FEDORA_PATCHES Mon Sep 17 00:00:00 2001 +From: Fedora GDB patches <invalid@email.com> +Date: Fri, 27 Oct 2017 21:07:50 +0200 +Subject: gdb-linux_perf-bundle.patch + +;; [dts+el7] [x86*] Bundle linux_perf.h for libipt (RH BZ 1256513). +;;=fedora + +diff --git a/gdb/gdb.c b/gdb/gdb.c +--- a/gdb/gdb.c ++++ b/gdb/gdb.c +@@ -21,6 +21,10 @@ + #include "interps.h" + #include "run-on-main-thread.h" + ++#ifdef PERF_ATTR_SIZE_VER5_BUNDLE ++extern "C" void __libipt_init(void); ++#endif ++ + int + main (int argc, char **argv) + { +@@ -32,6 +36,10 @@ main (int argc, char **argv) + + struct captured_main_args args; + ++#ifdef PERF_ATTR_SIZE_VER5_BUNDLE ++ __libipt_init(); ++#endif ++ + memset (&args, 0, sizeof args); + args.argc = argc; + args.argv = argv; +diff --git a/gdb/nat/linux-btrace.h b/gdb/nat/linux-btrace.h +--- a/gdb/nat/linux-btrace.h ++++ b/gdb/nat/linux-btrace.h +@@ -28,6 +28,177 @@ + # include <linux/perf_event.h> + #endif + ++#ifdef PERF_ATTR_SIZE_VER5_BUNDLE ++#ifndef HAVE_LINUX_PERF_EVENT_H ++# error "PERF_ATTR_SIZE_VER5_BUNDLE && !HAVE_LINUX_PERF_EVENT_H" ++#endif ++#ifndef PERF_ATTR_SIZE_VER5 ++#define PERF_ATTR_SIZE_VER5 ++#define perf_event_mmap_page perf_event_mmap_page_bundle ++// kernel-headers-3.10.0-493.el7.x86_64/usr/include/linux/perf_event.h ++/* ++ * Structure of the page that can be mapped via mmap ++ */ ++struct perf_event_mmap_page { ++ __u32 version; /* version number of this structure */ ++ __u32 compat_version; /* lowest version this is compat with */ ++ ++ /* ++ * Bits needed to read the hw events in user-space. ++ * ++ * u32 seq, time_mult, time_shift, index, width; ++ * u64 count, enabled, running; ++ * u64 cyc, time_offset; ++ * s64 pmc = 0; ++ * ++ * do { ++ * seq = pc->lock; ++ * barrier() ++ * ++ * enabled = pc->time_enabled; ++ * running = pc->time_running; ++ * ++ * if (pc->cap_usr_time && enabled != running) { ++ * cyc = rdtsc(); ++ * time_offset = pc->time_offset; ++ * time_mult = pc->time_mult; ++ * time_shift = pc->time_shift; ++ * } ++ * ++ * index = pc->index; ++ * count = pc->offset; ++ * if (pc->cap_user_rdpmc && index) { ++ * width = pc->pmc_width; ++ * pmc = rdpmc(index - 1); ++ * } ++ * ++ * barrier(); ++ * } while (pc->lock != seq); ++ * ++ * NOTE: for obvious reason this only works on self-monitoring ++ * processes. ++ */ ++ __u32 lock; /* seqlock for synchronization */ ++ __u32 index; /* hardware event identifier */ ++ __s64 offset; /* add to hardware event value */ ++ __u64 time_enabled; /* time event active */ ++ __u64 time_running; /* time event on cpu */ ++ union { ++ __u64 capabilities; ++ struct { ++ __u64 cap_bit0 : 1, /* Always 0, deprecated, see commit 860f085b74e9 */ ++ cap_bit0_is_deprecated : 1, /* Always 1, signals that bit 0 is zero */ ++ ++ cap_user_rdpmc : 1, /* The RDPMC instruction can be used to read counts */ ++ cap_user_time : 1, /* The time_* fields are used */ ++ cap_user_time_zero : 1, /* The time_zero field is used */ ++ cap_____res : 59; ++ }; ++ }; ++ ++ /* ++ * If cap_user_rdpmc this field provides the bit-width of the value ++ * read using the rdpmc() or equivalent instruction. This can be used ++ * to sign extend the result like: ++ * ++ * pmc <<= 64 - width; ++ * pmc >>= 64 - width; // signed shift right ++ * count += pmc; ++ */ ++ __u16 pmc_width; ++ ++ /* ++ * If cap_usr_time the below fields can be used to compute the time ++ * delta since time_enabled (in ns) using rdtsc or similar. ++ * ++ * u64 quot, rem; ++ * u64 delta; ++ * ++ * quot = (cyc >> time_shift); ++ * rem = cyc & (((u64)1 << time_shift) - 1); ++ * delta = time_offset + quot * time_mult + ++ * ((rem * time_mult) >> time_shift); ++ * ++ * Where time_offset,time_mult,time_shift and cyc are read in the ++ * seqcount loop described above. This delta can then be added to ++ * enabled and possible running (if index), improving the scaling: ++ * ++ * enabled += delta; ++ * if (index) ++ * running += delta; ++ * ++ * quot = count / running; ++ * rem = count % running; ++ * count = quot * enabled + (rem * enabled) / running; ++ */ ++ __u16 time_shift; ++ __u32 time_mult; ++ __u64 time_offset; ++ /* ++ * If cap_usr_time_zero, the hardware clock (e.g. TSC) can be calculated ++ * from sample timestamps. ++ * ++ * time = timestamp - time_zero; ++ * quot = time / time_mult; ++ * rem = time % time_mult; ++ * cyc = (quot << time_shift) + (rem << time_shift) / time_mult; ++ * ++ * And vice versa: ++ * ++ * quot = cyc >> time_shift; ++ * rem = cyc & (((u64)1 << time_shift) - 1); ++ * timestamp = time_zero + quot * time_mult + ++ * ((rem * time_mult) >> time_shift); ++ */ ++ __u64 time_zero; ++ __u32 size; /* Header size up to __reserved[] fields. */ ++ ++ /* ++ * Hole for extension of the self monitor capabilities ++ */ ++ ++ __u8 __reserved[118*8+4]; /* align to 1k. */ ++ ++ /* ++ * Control data for the mmap() data buffer. ++ * ++ * User-space reading the @data_head value should issue an smp_rmb(), ++ * after reading this value. ++ * ++ * When the mapping is PROT_WRITE the @data_tail value should be ++ * written by userspace to reflect the last read data, after issueing ++ * an smp_mb() to separate the data read from the ->data_tail store. ++ * In this case the kernel will not over-write unread data. ++ * ++ * See perf_output_put_handle() for the data ordering. ++ * ++ * data_{offset,size} indicate the location and size of the perf record ++ * buffer within the mmapped area. ++ */ ++ __u64 data_head; /* head in the data section */ ++ __u64 data_tail; /* user-space written tail */ ++ __u64 data_offset; /* where the buffer starts */ ++ __u64 data_size; /* data buffer size */ ++ ++ /* ++ * AUX area is defined by aux_{offset,size} fields that should be set ++ * by the userspace, so that ++ * ++ * aux_offset >= data_offset + data_size ++ * ++ * prior to mmap()ing it. Size of the mmap()ed area should be aux_size. ++ * ++ * Ring buffer pointers aux_{head,tail} have the same semantics as ++ * data_{head,tail} and same ordering rules apply. ++ */ ++ __u64 aux_head; ++ __u64 aux_tail; ++ __u64 aux_offset; ++ __u64 aux_size; ++}; ++#endif // PERF_ATTR_SIZE_VER5 ++#endif // PERF_ATTR_SIZE_VER5_BUNDLE ++ + struct target_ops; + + #if HAVE_LINUX_PERF_EVENT_H +diff --git a/gdbsupport/common.m4 b/gdbsupport/common.m4 +--- a/gdbsupport/common.m4 ++++ b/gdbsupport/common.m4 +@@ -168,7 +168,7 @@ AC_DEFUN([GDB_AC_COMMON], [ + AC_PREPROC_IFELSE([AC_LANG_SOURCE([[ + #include <linux/perf_event.h> + #ifndef PERF_ATTR_SIZE_VER5 +- # error ++ // error // PERF_ATTR_SIZE_VER5_BUNDLE is not available here - Fedora+RHEL + #endif + ]])], [perf_event=yes], [perf_event=no]) + if test "$perf_event" != yes; then |