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commit 387bff63dc2dccd62b09aa26dccf8cdc5f3c985c
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Author: Matheus Castanho <msc@linux.ibm.com>
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Date: Tue Oct 26 10:44:59 2021 -0300
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powerpc64[le]: Fix CFI and LR save address for asm syscalls [BZ #28532]
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Syscalls based on the assembly templates are missing CFI for r31, which gets
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clobbered when scv is used, and info for LR is inaccurate, placed in the wrong
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LOC and not using the proper offset. LR was also being saved to the callee's
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frame, while the ABI mandates it to be saved to the caller's frame. These are
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fixed by this commit.
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After this change:
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$ readelf -wF libc.so.6 | grep 0004b9d4.. -A 7 && objdump --disassemble=kill libc.so.6
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00004a48 0000000000000020 00004a4c FDE cie=00000000 pc=000000000004b9d4..000000000004ba3c
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LOC CFA r31 ra
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000000000004b9d4 r1+0 u u
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000000000004b9e4 r1+48 u u
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000000000004b9e8 r1+48 c-16 u
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000000000004b9fc r1+48 c-16 c+16
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000000000004ba08 r1+48 c-16
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000000000004ba18 r1+48 u
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000000000004ba1c r1+0 u
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libc.so.6: file format elf64-powerpcle
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Disassembly of section .text:
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000000000004b9d4 <kill>:
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4b9d4: 1f 00 4c 3c addis r2,r12,31
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4b9d8: 2c c3 42 38 addi r2,r2,-15572
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4b9dc: 25 00 00 38 li r0,37
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4b9e0: d1 ff 21 f8 stdu r1,-48(r1)
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4b9e4: 20 00 e1 fb std r31,32(r1)
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4b9e8: 98 8f ed eb ld r31,-28776(r13)
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4b9ec: 10 00 ff 77 andis. r31,r31,16
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4b9f0: 1c 00 82 41 beq 4ba0c <kill+0x38>
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4b9f4: a6 02 28 7d mflr r9
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4b9f8: 40 00 21 f9 std r9,64(r1)
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4b9fc: 01 00 00 44 scv 0
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4ba00: 40 00 21 e9 ld r9,64(r1)
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4ba04: a6 03 28 7d mtlr r9
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4ba08: 08 00 00 48 b 4ba10 <kill+0x3c>
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4ba0c: 02 00 00 44 sc
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4ba10: 00 00 bf 2e cmpdi cr5,r31,0
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4ba14: 20 00 e1 eb ld r31,32(r1)
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4ba18: 30 00 21 38 addi r1,r1,48
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4ba1c: 18 00 96 41 beq cr5,4ba34 <kill+0x60>
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4ba20: 01 f0 20 39 li r9,-4095
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4ba24: 40 48 23 7c cmpld r3,r9
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4ba28: 20 00 e0 4d bltlr+
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4ba2c: d0 00 63 7c neg r3,r3
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4ba30: 08 00 00 48 b 4ba38 <kill+0x64>
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4ba34: 20 00 e3 4c bnslr+
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4ba38: c8 32 fe 4b b 2ed00 <__syscall_error>
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...
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4ba44: 40 20 0c 00 .long 0xc2040
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4ba48: 68 00 00 00 .long 0x68
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4ba4c: 06 00 5f 5f rlwnm r31,r26,r0,0,3
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4ba50: 6b 69 6c 6c xoris r12,r3,26987
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(cherry picked from commit d120fb9941be1fb1934f0b50c6ad64e4c5e404fb)
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diff --git a/sysdeps/powerpc/powerpc64/sysdep.h b/sysdeps/powerpc/powerpc64/sysdep.h
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index 589f7c8d18814ee9..cfcfa69f91f1773d 100644
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--- a/sysdeps/powerpc/powerpc64/sysdep.h
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+++ b/sysdeps/powerpc/powerpc64/sysdep.h
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@@ -275,12 +275,14 @@ LT_LABELSUFFIX(name,_name_end): ; \
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/* Allocate frame and save register */
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#define NVOLREG_SAVE \
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stdu r1,-SCV_FRAME_SIZE(r1); \
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+ cfi_adjust_cfa_offset(SCV_FRAME_SIZE); \
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std r31,SCV_FRAME_NVOLREG_SAVE(r1); \
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- cfi_adjust_cfa_offset(SCV_FRAME_SIZE);
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+ cfi_rel_offset(r31,SCV_FRAME_NVOLREG_SAVE);
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/* Restore register and destroy frame */
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#define NVOLREG_RESTORE \
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ld r31,SCV_FRAME_NVOLREG_SAVE(r1); \
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+ cfi_restore(r31); \
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addi r1,r1,SCV_FRAME_SIZE; \
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cfi_adjust_cfa_offset(-SCV_FRAME_SIZE);
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@@ -331,13 +333,13 @@ LT_LABELSUFFIX(name,_name_end): ; \
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#define DO_CALL_SCV \
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mflr r9; \
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- std r9,FRAME_LR_SAVE(r1); \
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- cfi_offset(lr,FRAME_LR_SAVE); \
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+ std r9,SCV_FRAME_SIZE+FRAME_LR_SAVE(r1); \
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+ cfi_rel_offset(lr,SCV_FRAME_SIZE+FRAME_LR_SAVE); \
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.machine "push"; \
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.machine "power9"; \
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scv 0; \
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.machine "pop"; \
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- ld r9,FRAME_LR_SAVE(r1); \
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+ ld r9,SCV_FRAME_SIZE+FRAME_LR_SAVE(r1); \
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mtlr r9; \
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cfi_restore(lr);
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