aboutsummaryrefslogtreecommitdiff
path: root/gas
diff options
context:
space:
mode:
authorRichard Sandiford <rdsandiford@googlemail.com>2007-06-25 10:13:57 +0000
committerRichard Sandiford <rdsandiford@googlemail.com>2007-06-25 10:13:57 +0000
commitb314ec0eae7a778810550ccf87cd92eda7feaf2a (patch)
tree7c95af55b8663108c70d89bc4eb432cd3d5b4b47 /gas
parentb6fd0dfb46df6f46eace51d68b9de8318ebe3842 (diff)
downloadgdb-b314ec0eae7a778810550ccf87cd92eda7feaf2a.zip
gdb-b314ec0eae7a778810550ccf87cd92eda7feaf2a.tar.gz
gdb-b314ec0eae7a778810550ccf87cd92eda7feaf2a.tar.bz2
bfd/
* elfxx-mips.c (mips_elf_calculate_relocation): Allow local stubs to be used for calls from MIPS16 code. gas/ * config/tc-mips.h (TC_SYMFIELD_TYPE): New. * config/tc-mips.c (append_insn): Record which symbols have R_MIPS16_26 relocations against them. (mips_fix_adjustable): Don't reduce relocations against such symbols. ld/testsuite/ * ld-mips-elf/mips16-local-stubs-1.s, * ld-mips-elf/mips16-local-stubs-1.d: New tests. * ld-mips-elf/mips-elf.exp: Run them.
Diffstat (limited to 'gas')
-rw-r--r--gas/ChangeLog7
-rw-r--r--gas/config/tc-mips.c52
-rw-r--r--gas/config/tc-mips.h3
3 files changed, 58 insertions, 4 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog
index c713436..19a28fa 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2007-06-25 Richard Sandiford <richard@codesourcery.com>
+
+ * config/tc-mips.h (TC_SYMFIELD_TYPE): New.
+ * config/tc-mips.c (append_insn): Record which symbols have
+ R_MIPS16_26 relocations against them.
+ (mips_fix_adjustable): Don't reduce relocations against such symbols.
+
2007-06-22 Sterling Augustine <sterling@tensilica.com>
* config/tc-xtensa.c (xg_assembly_relax): Comment termination rules.
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 47a4b3c..39f681e 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -2792,6 +2792,11 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr,
reloc_type[0] == BFD_RELOC_16_PCREL_S2,
reloc_type[0]);
+ /* Tag symbols that have a R_MIPS16_26 relocation against them. */
+ if (reloc_type[0] == BFD_RELOC_MIPS16_JMP
+ && ip->fixp[0]->fx_addsy)
+ *symbol_get_tc (ip->fixp[0]->fx_addsy) = 1;
+
/* These relocations can have an addend that won't fit in
4 octets for 64bit assembly. */
if (HAVE_64BIT_GPRS
@@ -13612,11 +13617,50 @@ mips_fix_adjustable (fixS *fixp)
return 0;
#ifdef OBJ_ELF
- /* Don't adjust relocations against mips16 symbols, so that the linker
- can find them if it needs to set up a stub. */
+ /* R_MIPS16_26 relocations against non-MIPS16 functions might resolve
+ to a floating-point stub. The same is true for non-R_MIPS16_26
+ relocations against MIPS16 functions; in this case, the stub becomes
+ the function's canonical address.
+
+ Floating-point stubs are stored in unique .mips16.call.* or
+ .mips16.fn.* sections. If a stub T for function F is in section S,
+ the first relocation in section S must be against F; this is how the
+ linker determines the target function. All relocations that might
+ resolve to T must also be against F. We therefore have the following
+ restrictions, which are given in an intentionally-redundant way:
+
+ 1. We cannot reduce R_MIPS16_26 relocations against non-MIPS16
+ symbols.
+
+ 2. We cannot reduce a stub's relocations against non-MIPS16 symbols
+ if that stub might be used.
+
+ 3. We cannot reduce non-R_MIPS16_26 relocations against MIPS16
+ symbols.
+
+ 4. We cannot reduce a stub's relocations against MIPS16 symbols if
+ that stub might be used.
+
+ There is a further restriction:
+
+ 5. We cannot reduce R_MIPS16_26 relocations against MIPS16 symbols
+ on targets with in-place addends; the relocation field cannot
+ encode the low bit.
+
+ For simplicity, we deal with (3)-(5) by not reducing _any_ relocation
+ against a MIPS16 symbol.
+
+ We deal with (1)-(2) by saying that, if there's a R_MIPS16_26
+ relocation against some symbol R, no relocation against R may be
+ reduced. (Note that this deals with (2) as well as (1) because
+ relocations against global symbols will never be reduced on ELF
+ targets.) This approach is a little simpler than trying to detect
+ stub sections, and gives the "all or nothing" per-symbol consistency
+ that we have for MIPS16 symbols. */
if (IS_ELF
- && S_GET_OTHER (fixp->fx_addsy) == STO_MIPS16
- && fixp->fx_subsy == NULL)
+ && fixp->fx_subsy == NULL
+ && (S_GET_OTHER (fixp->fx_addsy) == STO_MIPS16
+ || *symbol_get_tc (fixp->fx_addsy)))
return 0;
#endif
diff --git a/gas/config/tc-mips.h b/gas/config/tc-mips.h
index 5a1e830..117417c 100644
--- a/gas/config/tc-mips.h
+++ b/gas/config/tc-mips.h
@@ -61,6 +61,9 @@ extern void mips_handle_align (struct frag *);
struct insn_label_list;
#define TC_SEGMENT_INFO_TYPE struct insn_label_list *
+/* This field is nonzero if the symbol is the target of a MIPS16 jump. */
+#define TC_SYMFIELD_TYPE int
+
/* Tell assembler that we have an itbl_mips.h header file to include. */
#define HAVE_ITBL_CPU