diff options
Diffstat (limited to 'gdb/arm-linux-tdep.c')
| -rw-r--r-- | gdb/arm-linux-tdep.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c index e33a93e..fd6b2e5 100644 --- a/gdb/arm-linux-tdep.c +++ b/gdb/arm-linux-tdep.c @@ -32,6 +32,7 @@ #include "regset.h" #include "trad-frame.h" #include "tramp-frame.h" +#include "breakpoint.h" #include "arm-tdep.h" #include "arm-linux-tdep.h" @@ -568,6 +569,26 @@ arm_linux_regset_from_core_section (struct gdbarch *gdbarch, return NULL; } +/* Insert a single step breakpoint at the next executed instruction. */ + +int +arm_linux_software_single_step (struct frame_info *frame) +{ + CORE_ADDR next_pc = arm_get_next_pc (frame, get_frame_pc (frame)); + + /* The Linux kernel offers some user-mode helpers in a high page. We can + not read this page (as of 2.6.23), and even if we could then we couldn't + set breakpoints in it, and even if we could then the atomic operations + would fail when interrupted. They are all called as functions and return + to the address in LR, so step to there instead. */ + if (next_pc > 0xffff0000) + next_pc = get_frame_register_unsigned (frame, ARM_LR_REGNUM); + + insert_single_step_breakpoint (next_pc); + + return 1; +} + static void arm_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) @@ -604,7 +625,7 @@ arm_linux_init_abi (struct gdbarch_info info, (gdbarch, svr4_ilp32_fetch_link_map_offsets); /* Single stepping. */ - set_gdbarch_software_single_step (gdbarch, arm_software_single_step); + set_gdbarch_software_single_step (gdbarch, arm_linux_software_single_step); /* Shared library handling. */ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |