diff options
Diffstat (limited to 'gdb/ppc-linux-tdep.c')
| -rw-r--r-- | gdb/ppc-linux-tdep.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c index 3134132..22ebfd2 100644 --- a/gdb/ppc-linux-tdep.c +++ b/gdb/ppc-linux-tdep.c @@ -591,6 +591,20 @@ ppc_linux_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache) return val; } +/* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather + than the 32 bit SYSV R4 ABI structure return convention - all + structures, no matter their size, are put in memory. Vectors, + which were added later, do get returned in a register though. */ + +static int +ppc_linux_use_struct_convention (int gcc_p, struct type *value_type) +{ + if ((TYPE_LENGTH (value_type) == 16 || TYPE_LENGTH (value_type) == 8) + && TYPE_VECTOR (value_type)) + return 0; + return 1; +} + /* Fetch (and possibly build) an appropriate link_map_offsets structure for GNU/Linux PPC targets using the struct offsets defined in link.h (but without actual reference to that file). @@ -1017,15 +1031,17 @@ ppc_linux_init_abi (struct gdbarch_info info, { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - /* Until November 2001, gcc was not complying to the SYSV ABI for - returning structures less than or equal to 8 bytes in size. It was - returning everything in memory. When this was corrected, it wasn't - fixed for native platforms. */ - set_gdbarch_use_struct_convention (gdbarch, - ppc_sysv_abi_broken_use_struct_convention); - if (tdep->wordsize == 4) { + /* Until November 2001, gcc did not comply with the 32 bit SysV + R4 ABI requirement that structures less than or equal to 8 + bytes should be returned in registers. Instead GCC was using + the the AIX/PowerOpen ABI - everything returned in memory + (well ignoring vectors that is). When this was corrected, it + wasn't fixed for GNU/Linux native platform. Use the + PowerOpen struct convention. */ + set_gdbarch_use_struct_convention (gdbarch, ppc_linux_use_struct_convention); + /* Note: kevinb/2002-04-12: See note in rs6000_gdbarch_init regarding *_push_arguments(). The same remarks hold for the methods below. */ set_gdbarch_frameless_function_invocation (gdbarch, |