diff options
Diffstat (limited to 'gdb/nat/linux-ptrace.h')
| -rw-r--r-- | gdb/nat/linux-ptrace.h | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/gdb/nat/linux-ptrace.h b/gdb/nat/linux-ptrace.h index ba58717..b9123c9 100644 --- a/gdb/nat/linux-ptrace.h +++ b/gdb/nat/linux-ptrace.h @@ -119,14 +119,14 @@ struct buffer; /* The x86 kernel gets some of the si_code values backwards, like this: - | what | si_code | - |------------------------------------------+------------| - | software breakpoints (int3) | SI_KERNEL | - | single-steps | TRAP_TRACE | - | single-stepping a syscall | TRAP_BRKPT | - | user sent SIGTRAP | 0 | - | exec SIGTRAP (when no PTRACE_EVENT_EXEC) | 0 | - | hardware breakpoints/watchpoints | TRAP_HWBPT | + | what | si_code | + |------------------------------------------+-------------| + | software breakpoints (int3) | SI_KERNEL | + | single-steps | TRAP_TRACE | + | single-stepping a syscall | TRAP_BRKPT | + | user sent SIGTRAP | 0 | + | exec SIGTRAP (when no PTRACE_EVENT_EXEC) | 0 | + | hardware breakpoints/watchpoints | TRAP_HWBKPT | That is, it reports SI_KERNEL for software breakpoints (and only for those), and TRAP_BRKPT for single-stepping a syscall... If the @@ -140,14 +140,32 @@ struct buffer; in SPU code on a Cell/B.E. However, SI_KERNEL is never seen on a SIGTRAP for any other reason. - The generic Linux target code should use GDB_ARCH_IS_TRAP_BRKPT - instead of TRAP_BRKPT to abstract out these peculiarities. */ + The MIPS kernel uses SI_KERNEL for all kernel generated traps. + Since: + + - MIPS doesn't do hardware single-step. + - We don't need to care about exec SIGTRAPs --- we assume + PTRACE_EVENT_EXEC is available. + - The MIPS kernel doesn't support hardware breakpoints. + + on MIPS, all we need to care about is distinguishing between + software breakpoints and hardware watchpoints, which can be done by + peeking the debug registers. + + The generic Linux target code should use GDB_ARCH_IS_TRAP_* instead + of TRAP_* to abstract out these peculiarities. */ #if defined __i386__ || defined __x86_64__ # define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == SI_KERNEL) +# define GDB_ARCH_IS_TRAP_HWBKPT(X) ((X) == TRAP_HWBKPT) #elif defined __powerpc__ # define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == SI_KERNEL || (X) == TRAP_BRKPT) +# define GDB_ARCH_IS_TRAP_HWBKPT(X) ((X) == TRAP_HWBKPT) +#elif defined __mips__ +# define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == SI_KERNEL) +# define GDB_ARCH_IS_TRAP_HWBKPT(X) ((X) == SI_KERNEL) #else # define GDB_ARCH_IS_TRAP_BRKPT(X) ((X) == TRAP_BRKPT) +# define GDB_ARCH_IS_TRAP_HWBKPT(X) ((X) == TRAP_HWBKPT) #endif #ifndef TRAP_HWBKPT |