diff options
Diffstat (limited to 'gdb/m68klinux-tdep.c')
-rw-r--r-- | gdb/m68klinux-tdep.c | 118 |
1 files changed, 10 insertions, 108 deletions
diff --git a/gdb/m68klinux-tdep.c b/gdb/m68klinux-tdep.c index c174daa..0b84483 100644 --- a/gdb/m68klinux-tdep.c +++ b/gdb/m68klinux-tdep.c @@ -1,7 +1,7 @@ /* Motorola m68k target-dependent support for GNU/Linux. - Copyright 1996, 1998, 2000, 2001, 2002, 2003 Free Software Foundation, - Inc. + Copyright 1996, 1998, 2000, 2001, 2002, 2003, 2004 + Free Software Foundation, Inc. This file is part of GDB. @@ -275,108 +275,6 @@ m68k_linux_sigtramp_frame_sniffer (struct frame_info *next_frame) return NULL; } -/* Extract from an array REGBUF containing the (raw) register state, a - function return value of TYPE, and copy that, in virtual format, - into VALBUF. */ - -static void -m68k_linux_extract_return_value (struct type *type, struct regcache *regcache, - void *valbuf) -{ - int len = TYPE_LENGTH (type); - char buf[M68K_MAX_REGISTER_SIZE]; - - if (TYPE_CODE (type) == TYPE_CODE_STRUCT - && TYPE_NFIELDS (type) == 1) - { - m68k_linux_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, - valbuf); - return; - } - - if (TYPE_CODE (type) == TYPE_CODE_FLT) - { - regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); - convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type); - } - else if (TYPE_CODE (type) == TYPE_CODE_PTR) - regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); - else - { - if (len <= 4) - { - regcache_raw_read (regcache, M68K_D0_REGNUM, buf); - memcpy (valbuf, buf + (4 - len), len); - } - else if (len <= 8) - { - regcache_raw_read (regcache, M68K_D0_REGNUM, buf); - memcpy (valbuf, buf + (8 - len), len - 4); - regcache_raw_read (regcache, M68K_D1_REGNUM, - (char *) valbuf + (len - 4)); - } - else - internal_error (__FILE__, __LINE__, - "Cannot extract return value of %d bytes long.", len); - } -} - -/* Write into the appropriate registers a function return value stored - in VALBUF of type TYPE, given in virtual format. */ - -static void -m68k_linux_store_return_value (struct type *type, struct regcache *regcache, - const void *valbuf) -{ - int len = TYPE_LENGTH (type); - - if (TYPE_CODE (type) == TYPE_CODE_STRUCT - && TYPE_NFIELDS (type) == 1) - { - m68k_linux_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, - valbuf); - return; - } - - if (TYPE_CODE (type) == TYPE_CODE_FLT) - { - char buf[M68K_MAX_REGISTER_SIZE]; - convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext); - regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); - } - else if (TYPE_CODE (type) == TYPE_CODE_PTR) - regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); - else - { - if (len <= 4) - regcache_raw_write_part (regcache, M68K_D0_REGNUM, - 4 - len, len, valbuf); - else if (len <= 8) - { - regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len, - len - 4, valbuf); - regcache_raw_write (regcache, M68K_D0_REGNUM, - (char *) valbuf + (len - 4)); - } - else - internal_error (__FILE__, __LINE__, - "Cannot store return value of %d bytes long.", len); - } -} - -/* Extract from an array REGBUF containing the (raw) register state - the address in which a function should return its structure value, - as a CORE_ADDR. */ - -static CORE_ADDR -m68k_linux_extract_struct_value_address (struct regcache *regcache) -{ - char buf[4]; - - regcache_cooked_read (regcache, M68K_A0_REGNUM, buf); - return extract_unsigned_integer (buf, 4); -} - static void m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { @@ -384,11 +282,15 @@ m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) tdep->jb_pc = M68K_LINUX_JB_PC; tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE; - tdep->struct_return = reg_struct_return; - set_gdbarch_extract_return_value (gdbarch, m68k_linux_extract_return_value); - set_gdbarch_store_return_value (gdbarch, m68k_linux_store_return_value); - set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_linux_extract_struct_value_address); + /* GNU/Linux uses a calling convention that's similar to SVR4. It + returns integer values in %d0/%di, pointer values in %a0 and + floating values in %fp0, just like SVR4, but uses %a1 to pass the + address to store a structure value. It also returns small + structures in registers instead of memory. */ + m68k_svr4_init_abi (info, gdbarch); + tdep->struct_value_regnum = M68K_A1_REGNUM; + tdep->struct_return = reg_struct_return; frame_unwind_append_sniffer (gdbarch, m68k_linux_sigtramp_frame_sniffer); |