diff options
Diffstat (limited to 'gdb/dwarf-frame.c')
| -rw-r--r-- | gdb/dwarf-frame.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gdb/dwarf-frame.c b/gdb/dwarf-frame.c index 6279171c7ee..a1d963491fa 100644 --- a/gdb/dwarf-frame.c +++ b/gdb/dwarf-frame.c @@ -796,6 +796,20 @@ read_initial_length (bfd *abfd, char *buf, unsigned int *bytes_read_ptr) /* Pointer encoding helper functions. */ +/* GCC supports exception handling based on DWARF2 CFI. However, for + technical reasons, it encodes addresses in its FDE's in a different + way. Several "pointer encodings" are supported. The encoding + that's used for a particular FDE is determined by the 'R' + augmentation in the associated CIE. The argument of this + augmentation is a single byte. + + The address can be encoded as 2 bytes, 4 bytes, 8 bytes, or as a + LEB128. This is encoded in bits 0, 1 and 2. Bit 3 encodes whether + the address is signed or unsigned. Bits 4, 5 and 6 encode how the + address should be interpreted (absolute, relative to the current + position in the FDE, ...). Bit 7, indicates that the address + should be dereferenced. */ + static unsigned char encoding_for_size (unsigned int size) { @@ -958,7 +972,7 @@ add_fde (struct comp_unit *unit, struct dwarf_fde *fde) #define DW64_CIE_ID ~0 #endif -/* Read and the CIE or FDE in BUF and decode it. */ +/* Read a CIE or FDE in BUF and decode it. */ static char * decode_frame_entry (struct comp_unit *unit, char *buf, int eh_frame_p) |