morello-binutils: Adjust c64_valid_cap_range calculation

This function had a buggy implementation of rounding a value up to a
given power of 2.  Aligning to a multiple of 16 would align to a
multiple of 32 and so on.

This was observable when linking object files that had very large
objects in them.  The compiler would ensure that these objects are large
enough that they are exactly representable, but the linker would
complain that they are not because the linker asserted extra alignment
than the compiler.

Here we fix the bug, add a few testcases, and adjust an existing
testcase in the area.

diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index 94f5cbca3baf7415bc96365e592e98d905dac484..55bf288a754383fa721e369df6891c3cf4e067ec 100644 (file)
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -4797,7 +4797,7 @@ exponent (uint64_t len)
 #undef CAP_MAX_EXPONENT
 }
 
-#define ONES(x)         ((1ULL << ((x) + 1)) - 1)
+#define ONES(x)         ((1ULL << (x)) - 1)
 #define ALIGN_UP(x, a)  (((x) + ONES (a)) & (~ONES (a)))
 
 static bfd_boolean

diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index e9cb95d5e17b43b5ed4fc25e782a9d668c9d785c..228cfe224c57efc1cac6c694d304d8186e8749d6 100644 (file)
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -244,6 +244,8 @@ run_dump_test_lp64 "emit-relocs-morello-2"
 run_dump_test_lp64 "emit-relocs-morello-2-a64c"
 run_dump_test_lp64 "emit-relocs-morello-3"
 run_dump_test_lp64 "emit-relocs-morello-3-a64c"
+run_dump_test_lp64 "emit-relocs-morello-4"
+run_dump_test_lp64 "emit-relocs-morello-5"
 
 run_dump_test_lp64 "morello-capinit"
 run_dump_test_lp64 "morello-stubs"

diff --git a/ld/testsuite/ld-aarch64/emit-relocs-morello-4.d b/ld/testsuite/ld-aarch64/emit-relocs-morello-4.d
new file mode 100644 (file)
index 0000000..04cfa79
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/emit-relocs-morello-4.d
@@ -0,0 +1,14 @@
+#source: emit-relocs-morello-4.s
+#as: -march=morello+c64
+#ld: -static
+#readelf: --relocs --syms
+
+
+#...
+Relocation section[^\n]*contains 1 entry:
+#...
+Symbol table[^\n]*contains[^\n]*:
+   Num:    Value          Size.*
+#...
+    [0-9]+: [0-9a-f]+0 64016 [^\n]* bigarray
+#pass

diff --git a/ld/testsuite/ld-aarch64/emit-relocs-morello-4.s b/ld/testsuite/ld-aarch64/emit-relocs-morello-4.s
new file mode 100644 (file)
index 0000000..d91d85a
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/emit-relocs-morello-4.s
@@ -0,0 +1,17 @@
+// Checking that having a relocation against very large arrays that are not
+// problematic w.r.t. capability bounds representation do not error.
+// The below is somthing that requires being padded
+.bss
+.globl bigarray
+.p2align 4
+bigarray:
+       .zero 64004
+       .zero 12                 // Tail padding to ensure precise bounds.
+       .size bigarray, 64016
+
+.text
+.globl _start
+.type _start STT_FUNC
+_start:
+       adrp    c0, :got:bigarray
+       ldr     c0, [c0, #:got_lo12:bigarray]

diff --git a/ld/testsuite/ld-aarch64/emit-relocs-morello-5.d b/ld/testsuite/ld-aarch64/emit-relocs-morello-5.d
new file mode 100644 (file)
index 0000000..05bbef1
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/emit-relocs-morello-5.d
@@ -0,0 +1,6 @@
+#source: emit-relocs-morello-5.s
+#as: -march=morello+c64
+#ld: -static
+#error: .*: capability range may exceed object bounds
+#error: .*: in function `_start':.*
+#error: .*: dangerous relocation: unsupported relocation

diff --git a/ld/testsuite/ld-aarch64/emit-relocs-morello-5.s b/ld/testsuite/ld-aarch64/emit-relocs-morello-5.s
new file mode 100644 (file)
index 0000000..0493c26
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/emit-relocs-morello-5.s
@@ -0,0 +1,15 @@
+// Checking that having a relocation against very large arrays whose size can
+// not be represented gives the corresponding error.
+.bss
+.globl bigarray
+.p2align 4
+bigarray:
+       .zero 64004
+       .size bigarray, 64004
+
+.text
+.globl _start
+.type _start STT_FUNC
+_start:
+       adrp    c0, :got:bigarray
+       ldr     c0, [c0, #:got_lo12:bigarray]

diff --git a/ld/testsuite/ld-aarch64/morello-sec-round.d b/ld/testsuite/ld-aarch64/morello-sec-round.d
index 00eceb0386a3f8890c2876a4a6bac9569f146e33..b553a604acd92a2b0c5e151546e2c19a04101f70 100644 (file)
--- a/ld/testsuite/ld-aarch64/morello-sec-round.d
+++ b/ld/testsuite/ld-aarch64/morello-sec-round.d
@@ -7,5 +7,5 @@ Idx Name          Size      VMA               LMA               File off  Algn
 #...
   1 .text_sec     00020004  ...........20000  [0-9a-f]+  [0-9a-f]+  2\*\*17
                   CONTENTS, ALLOC, LOAD, READONLY, CODE
-  2 \..*       [0-9a-f]+  ...........40080  [0-9a-f]+  [0-9a-f]+  .*
+  2 \..*       [0-9a-f]+  ...........40040  [0-9a-f]+  [0-9a-f]+  .*
 #pass