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| author | Shuo Wang <wangshuo47@huawei.com> | 2021-01-05 10:04:12 +0800 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-01-05 09:25:19 +0000 |
| commit | f5082c70101d5b6c10c312f86c9de7fecf0075b6 (patch) | |
| tree | 53b1ba5307cb51a8e39697a1d3b5b353bb912bd1 | |
| parent | c50c65a8bf81753c09d60ee07e02016607d1abf2 (diff) | |
| download | glibc-f5082c70101d5b6c10c312f86c9de7fecf0075b6.tar.gz glibc-f5082c70101d5b6c10c312f86c9de7fecf0075b6.tar.xz glibc-f5082c70101d5b6c10c312f86c9de7fecf0075b6.zip | |
aarch64: push the set of rules before falling into slow path
It is supposed to save the rules for the instructions before falling into slow path.
Tested in glibc-2.28 before fixing:
Thread 2 "xxxxxxx" hit Breakpoint 1, _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:149
149 stp x1, x2, [sp, #-32]!
Missing separate debuginfos, use: dnf debuginfo-install libgcc-7.3.0-20190804.h24.aarch64
(gdb) ni
_dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:150
150 stp x3, x4, [sp, #16]
(gdb)
_dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:157
157 mrs x4, tpidr_el0
(gdb)
158 ldr PTR_REG (1), [x0,#TLSDESC_ARG]
(gdb)
159 ldr PTR_REG (0), [x4,#TCBHEAD_DTV]
(gdb)
160 ldr PTR_REG (3), [x1,#TLSDESC_GEN_COUNT]
(gdb)
161 ldr PTR_REG (2), [x0,#DTV_COUNTER]
(gdb)
162 cmp PTR_REG (3), PTR_REG (2)
(gdb)
163 b.hi 2f
(gdb)
165 ldp PTR_REG (2), PTR_REG (3), [x1,#TLSDESC_MODID]
(gdb)
166 add PTR_REG (0), PTR_REG (0), PTR_REG (2), lsl #(PTR_LOG_SIZE + 1)
(gdb)
167 ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */
(gdb)
168 cmp PTR_REG (0), #TLS_DTV_UNALLOCATED
(gdb)
169 b.eq 2f
(gdb) bt
#0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:169
#1 0x0000ffffbe4fbb44 in OurFunction (threadId=4294967295)
at /home/test/test_function.c:30
#2 0x0000000000400c08 in initaaa () at thread.c:58
#3 0x0000000000400c50 in thread_proc (param=0x0) at thread.c:71
#4 0x0000ffffbf6918bc in start_thread (arg=0xfffffffff29f) at pthread_create.c:486
#5 0x0000ffffbf5669ec in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78
(gdb) ni
_dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:184
184 stp x29, x30, [sp,#-16*NSAVEXREGPAIRS]!
(gdb) bt
#0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:184
#1 0x0000ffffbe4fbb44 in OurFunction (threadId=4294967295)
at /home/test/test_function.c:30
#2 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Co-authored-by: liqingqing <liqingqing3@huawei.com>
| -rw-r--r-- | sysdeps/aarch64/dl-tlsdesc.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S index 425e45a50f..4777262be1 100644 --- a/sysdeps/aarch64/dl-tlsdesc.S +++ b/sysdeps/aarch64/dl-tlsdesc.S @@ -170,6 +170,7 @@ _dl_tlsdesc_dynamic: ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */ cmp PTR_REG (0), #TLS_DTV_UNALLOCATED b.eq 2f + cfi_remember_state sub PTR_REG (3), PTR_REG (3), PTR_REG (4) add PTR_REG (0), PTR_REG (0), PTR_REG (3) 1: @@ -183,6 +184,7 @@ _dl_tlsdesc_dynamic: callee will trash. */ /* Save the remaining registers that we must treat as caller save. */ + cfi_restore_state # if HAVE_AARCH64_PAC_RET PACIASP cfi_window_save |