* elf-eh-frame.c (skip_cfa_op, skip_non_nops): New functions.

	(_bfd_elf_discard_section_eh_frame): Use them to interpret the CFA
	instructions.  If the amount of padding is known, reduce the size
	of the CIE or FDE by that amount.

1 files changed, 255 insertions, 0 deletions

diff --git a/ld/testsuite/ld-mips-elf/eh-frame2-n32.d b/ld/testsuite/ld-mips-elf/eh-frame2-n32.d
new file mode 100644
index 0000000..1345658
--- /dev/null
+++ b/ld/testsuite/ld-mips-elf/eh-frame2-n32.d
@@ -0,0 +1,255 @@
+#name: MIPS eh-frame 2, n32
+#source: eh-frame1.s
+#source: eh-frame1.s
+#as: -EB -n32 --defsym alignment=2 --defsym fill=0
+#readelf: --relocs -wf
+#ld: -shared -melf32btsmipn32 -Teh-frame1.ld
+
+Relocation section '\.rel\.dyn' .*:
+ *Offset .*
+00000000  00000000 R_MIPS_NONE *
+# Initial PCs for the FDEs attached to CIE 0xb8
+000300d8  00000003 R_MIPS_REL32 *
+000300ec  00000003 R_MIPS_REL32 *
+# Likewise CIE 0x218
+00030238  00000003 R_MIPS_REL32 *
+0003024c  00000003 R_MIPS_REL32 *
+0003008b  00000503 R_MIPS_REL32      00000000   foo
+000300cc  00000503 R_MIPS_REL32      00000000   foo
+0003010a  00000503 R_MIPS_REL32      00000000   foo
+000301eb  00000503 R_MIPS_REL32      00000000   foo
+0003022c  00000503 R_MIPS_REL32      00000000   foo
+0003026a  00000503 R_MIPS_REL32      00000000   foo
+#...
+The section \.eh_frame contains:
+
+00000000 00000010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     10
+
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000014 00000010 00000018 FDE cie=00000000 pc=00020000..00020010
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000028 00000010 0000002c FDE cie=00000000 pc=00020010..00020030
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+# basic2 removed
+0000003c 00000010 00000040 FDE cie=00000000 pc=00020030..00020060
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+# basic3 removed
+00000050 00000010 00000054 FDE cie=00000000 pc=00020060..000200a0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+# basic4 removed
+00000064 00000010 00000068 FDE cie=00000000 pc=000200a0..000200f0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000078 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zRP"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     10 00 00 00 00 00
+
+  DW_CFA_nop
+
+00000090 00000010 0000001c FDE cie=00000078 pc=000200f0..00020100
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000000a4 00000010 00000030 FDE cie=00000078 pc=00020100..00020120
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000000b8 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zP"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     50 00 00 00 00 00 00 00
+
+
+000000d0 00000010 0000001c FDE cie=000000b8 pc=00020120..00020130
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000000e4 00000010 00000030 FDE cie=000000b8 pc=00020130..00020150
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000000f8 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zPR"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     00 00 00 00 00 10
+
+  DW_CFA_nop
+
+00000110 00000010 0000001c FDE cie=000000f8 pc=00020150..00020160
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+# FDE for .discard removed
+# zPR2 removed
+00000124 00000010 00000030 FDE cie=000000f8 pc=00020160..00020190
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000138 00000010 00000044 FDE cie=000000f8 pc=00020190..000201d0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0000014c 00000010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     10
+
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000160 00000010 00000018 FDE cie=0000014c pc=000201d0..000201e0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+# basic1 removed, followed by repeat of above
+00000174 00000010 0000002c FDE cie=0000014c pc=000201e0..000201f0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000188 00000010 00000040 FDE cie=0000014c pc=000201f0..00020210
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0000019c 00000010 00000054 FDE cie=0000014c pc=00020210..00020240
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000001b0 00000010 00000068 FDE cie=0000014c pc=00020240..00020280
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000001c4 00000010 0000007c FDE cie=0000014c pc=00020280..000202d0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000001d8 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zRP"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     10 00 00 00 00 00
+
+  DW_CFA_nop
+
+000001f0 00000010 0000001c FDE cie=000001d8 pc=000202d0..000202e0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000204 00000010 00000030 FDE cie=000001d8 pc=000202e0..00020300
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000218 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zP"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     50 00 00 00 00 00 00 00
+
+
+00000230 00000010 0000001c FDE cie=00000218 pc=00020300..00020310
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000244 00000010 00000030 FDE cie=00000218 pc=00020310..00020330
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000258 00000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zPR"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     00 00 00 00 00 10
+
+  DW_CFA_nop
+
+00000270 00000010 0000001c FDE cie=00000258 pc=00020330..00020340
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000284 00000010 00000030 FDE cie=00000258 pc=00020340..00020370
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+00000298 00000010 00000044 FDE cie=00000258 pc=00020370..000203b0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000002ac 00000010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 1
+  Data alignment factor: 4
+  Return address column: 31
+  Augmentation data:     10
+
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+000002c0 00000010 00000018 FDE cie=000002ac pc=000203b0..000203c0
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+