From 097f6ab4652c0d540eb530874c9060d3d308ee6d Mon Sep 17 00:00:00 2001 From: Mark Kettenis Date: Sun, 22 Jan 2006 16:33:34 +0000 Subject: * sparc-tdep.c (sparc32_return_value): Convert to use RETURN_VALUE_ABI_PRESERVES_ADDRESS instead of RETURN_VALUE_STRUCT_CONVENTION. (sparc32_extract_struct_value_address): Remove. --- gdb/sparc-tdep.c | 49 +++++++++++++++++++++---------------------------- 1 file changed, 21 insertions(+), 28 deletions(-) (limited to 'gdb/sparc-tdep.c') diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c index 7aa51a970fb..ab9f1044c10 100644 --- a/gdb/sparc-tdep.c +++ b/gdb/sparc-tdep.c @@ -1,6 +1,6 @@ /* Target-dependent code for SPARC. - Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. This file is part of GDB. @@ -956,9 +956,28 @@ sparc32_return_value (struct gdbarch *gdbarch, struct type *type, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf) { + /* The psABI says that "...every stack frame reserves the word at + %fp+64. If a function returns a structure, union, or + quad-precision value, this word should hold the address of the + object into which the return value should be copied." This + guarantees that we can always find the return value, not just + before the function returns. */ + if (sparc_structure_or_union_p (type) || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16)) - return RETURN_VALUE_STRUCT_CONVENTION; + { + if (readbuf) + { + ULONGEST sp; + CORE_ADDR addr; + + regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); + addr = read_memory_unsigned_integer (sp + 64, 4); + read_memory (addr, readbuf, TYPE_LENGTH (type)); + } + + return RETURN_VALUE_ABI_PRESERVES_ADDRESS; + } if (readbuf) sparc32_extract_return_value (type, regcache, readbuf); @@ -968,32 +987,6 @@ sparc32_return_value (struct gdbarch *gdbarch, struct type *type, return RETURN_VALUE_REGISTER_CONVENTION; } -#if 0 -/* NOTE: cagney/2004-01-17: For the moment disable this method. The - architecture and CORE-gdb will need new code (and a replacement for - DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS) before this can be made to - work robustly. Here is a possible function signature: */ -/* NOTE: cagney/2004-01-17: So far only the 32-bit SPARC ABI has been - identifed as having a way to robustly recover the address of a - struct-convention return-value (after the function has returned). - For all other ABIs so far examined, the calling convention makes no - guarenteed that the register containing the return-value will be - preserved and hence that the return-value's address can be - recovered. */ -/* Extract from REGCACHE, which contains the (raw) register state, the - address in which a function should return its structure value, as a - CORE_ADDR. */ - -static CORE_ADDR -sparc32_extract_struct_value_address (struct regcache *regcache) -{ - ULONGEST sp; - - regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); - return read_memory_unsigned_integer (sp + 64, 4); -} -#endif - static int sparc32_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type) { -- cgit v1.2.1