From 3605c34ae8991579487a42f8f1f765b298d8489f Mon Sep 17 00:00:00 2001 From: "Theodore A. Roth" Date: Tue, 17 Jun 2003 04:44:18 +0000 Subject: [PATCH] * avr-tdep.c (avr_extract_return_value): New function. (avr_gdbarch_init): Set extract_return_value method. --- gdb/ChangeLog | 5 +++++ gdb/avr-tdep.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 96ff655..462b20d 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2003-06-16 Theodore A. Roth + + * avr-tdep.c (avr_extract_return_value): New function. + (avr_gdbarch_init): Set extract_return_value method. + 2003-06-16 Andrew Cagney * frame.h (deprecated_get_next_frame_hack): Declare. diff --git a/gdb/avr-tdep.c b/gdb/avr-tdep.c index c9c5df0..cb23746 100644 --- a/gdb/avr-tdep.c +++ b/gdb/avr-tdep.c @@ -1094,6 +1094,39 @@ avr_breakpoint_from_pc (CORE_ADDR * pcptr, int *lenptr) return avr_break_insn; } +/* Given a return value in `regbuf' with a type `valtype', + extract and copy its value into `valbuf'. + + Return values are always passed via registers r25:r24:... */ + +static void +avr_extract_return_value (struct type *type, struct regcache *regcache, + void *valbuf) +{ + if (TYPE_LENGTH (type) == 1) + { + ULONGEST c; + + /* For single byte return values, r25 is always cleared, so we can + ignore it. */ + regcache_cooked_read_unsigned (regcache, 24, &c); + store_unsigned_integer (valbuf, 1, c); + } + else + { + int i; + /* The MSB of the return value is always in r25, calculate which + register holds the LSB. */ + int lsb_reg = 25 - TYPE_LENGTH (type) + 1; + + for (i=0; i< TYPE_LENGTH (type); i++) + { + regcache_cooked_read (regcache, lsb_reg + i, + (bfd_byte *) valbuf + i); + } + } +} + /* Initialize the gdbarch structure for the AVR's. */ static struct gdbarch * @@ -1157,6 +1190,7 @@ avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_register_name (gdbarch, avr_register_name); set_gdbarch_register_type (gdbarch, avr_register_type); + set_gdbarch_extract_return_value (gdbarch, avr_extract_return_value); set_gdbarch_print_insn (gdbarch, print_insn_avr); set_gdbarch_call_dummy_address (gdbarch, avr_call_dummy_address); -- 2.7.4