diff options
Diffstat (limited to 'gdb/config/m68k/tm-sun3.h')
| -rw-r--r-- | gdb/config/m68k/tm-sun3.h | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/gdb/config/m68k/tm-sun3.h b/gdb/config/m68k/tm-sun3.h index 253fd53ff5b..aafba6a9928 100644 --- a/gdb/config/m68k/tm-sun3.h +++ b/gdb/config/m68k/tm-sun3.h @@ -86,17 +86,18 @@ /* The code which tries to deal with this bug is never harmful on a sun3. */ #define SUN_FIXED_LBRAC_BUG (0) -/* On the sun3 the kernel pushes a sigcontext on the user stack and then - `calls' _sigtramp in user code. _sigtramp saves the floating point status - on the stack and calls the signal handler function. The stack does not - contain enough information to allow a normal backtrace, but sigcontext - contains the saved user pc/sp. FRAME_CHAIN and friends in tm-m68k.h and - m68k_find_saved_regs deal with this situation by manufacturing a fake frame - for _sigtramp. - SIG_PC_FP_OFFSET is the offset from the signal handler frame to the - saved pc in sigcontext. - SIG_SP_FP_OFFSET is the offset from the signal handler frame to the end - of sigcontext which is identical to the saved sp at SIG_PC_FP_OFFSET - 4. +/* On the sun3 the kernel pushes a sigcontext on the user stack and + then `calls' _sigtramp in user code. _sigtramp saves the floating + point status on the stack and calls the signal handler + function. The stack does not contain enough information to allow a + normal backtrace, but sigcontext contains the saved user + pc/sp. DEPRECATED_FRAME_CHAIN and friends in tm-m68k.h and + m68k_find_saved_regs deal with this situation by manufacturing a + fake frame for _sigtramp. SIG_PC_FP_OFFSET is the offset from the + signal handler frame to the saved pc in sigcontext. + SIG_SP_FP_OFFSET is the offset from the signal handler frame to the + end of sigcontext which is identical to the saved sp at + SIG_PC_FP_OFFSET - 4. Please note that it is impossible to correctly backtrace from a breakpoint in _sigtramp as _sigtramp modifies the stack pointer a few times. */ |