diff options
Diffstat (limited to 'gdb/gdbarch.h')
| -rw-r--r-- | gdb/gdbarch.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h index cf460b86840..eb501def9f4 100644 --- a/gdb/gdbarch.h +++ b/gdb/gdbarch.h @@ -49,6 +49,7 @@ struct regset; struct disassemble_info; struct target_ops; struct obstack; +struct dwarf_expr_piece; extern struct gdbarch *current_gdbarch; @@ -436,6 +437,32 @@ extern void set_gdbarch_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, gdbarch_d #define DWARF2_REG_TO_REGNUM(dwarf2_regnr) (gdbarch_dwarf2_reg_to_regnum (current_gdbarch, dwarf2_regnr)) #endif +/* On some architectures, GDB has registers that Dwarf treats as the + concatenation of two separate registers. For example, PowerPC + variants implementing the SPE APU have 64-bit general-purpose + registers. GDB refers to the lower 32 bits of each register as 'r0' + -- 'r31', and the full 64-bit registers as 'ev0' -- 'ev31'. + However, the Dwarf register numbering treats the upper halves as + separate registers. + + Dwarf location expressions describe variables allocated to such + registers using a series of DW_OP_piece operations. In the case + above, the expressions would have the form: + + <upper half> DW_OP_piece 4 <lower half> DW_OP_piece 4. + + However, since GDB does have a register that corresponds to the + entire variable, it can simply say the variable lives in that + register; it needn't use a complicated location description. + + Given an array of NUM_PIECES pieces PIECES, return the number of the + register that is equivalent to those pieces, or -1 if there is no + such register. */ + +typedef int (gdbarch_dwarf_simplify_register_pieces_ftype) (struct gdbarch *gdbarch, int num_pieces, struct dwarf_expr_piece *pieces); +extern int gdbarch_dwarf_simplify_register_pieces (struct gdbarch *gdbarch, int num_pieces, struct dwarf_expr_piece *pieces); +extern void set_gdbarch_dwarf_simplify_register_pieces (struct gdbarch *gdbarch, gdbarch_dwarf_simplify_register_pieces_ftype *dwarf_simplify_register_pieces); + typedef const char * (gdbarch_register_name_ftype) (int regnr); extern const char * gdbarch_register_name (struct gdbarch *gdbarch, int regnr); extern void set_gdbarch_register_name (struct gdbarch *gdbarch, gdbarch_register_name_ftype *register_name); |