diff options
Diffstat (limited to 'gdb/ppc-linux-tdep.c')
| -rw-r--r-- | gdb/ppc-linux-tdep.c | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c index 05b051045bf..22ebfd2bb2f 100644 --- a/gdb/ppc-linux-tdep.c +++ b/gdb/ppc-linux-tdep.c @@ -188,7 +188,7 @@ ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name) return (pc == handler || pc == handler + 4); } -static inline int +static int insn_is_sigreturn (unsigned long pcinsn) { switch(pcinsn) @@ -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). @@ -929,18 +943,6 @@ ppc64_linux_convert_from_func_ptr_addr (CORE_ADDR addr) } -/* On 64-bit PowerPC GNU/Linux, the ELF header's e_entry field is the - address of a function descriptor for the entry point function, not - the actual entry point itself. So to find the actual address at - which execution should begin, we need to fetch the function's entry - point from that descriptor. */ -static CORE_ADDR -ppc64_call_dummy_address (void) -{ - return ppc64_desc_entry_point (entry_point_address ()); -} - - enum { ELF_NGREG = 48, ELF_NFPREG = 33, @@ -1029,15 +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, @@ -1067,8 +1071,6 @@ ppc_linux_init_abi (struct gdbarch_info info, set_gdbarch_convert_from_func_ptr_addr (gdbarch, ppc64_linux_convert_from_func_ptr_addr); - set_gdbarch_call_dummy_address (gdbarch, ppc64_call_dummy_address); - set_gdbarch_in_solib_call_trampoline (gdbarch, ppc64_in_solib_call_trampoline); set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |