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Elliott Hughes 838dbacbfd linker: add LD_SHOW_AUXV support. 
Yes, `od -t d8 /proc/self/auxv` is clever:
```
$ adb shell od -t d8 /proc/self/auxv
0000000                      33            488593047552
0000020                      51                    4720
0000040                      16                 1155071
0000060                       6                    4096
0000100                      17                     100
0000120                       3            375971917888
0000140                       4                      56
0000160                       5                      12
0000200                       7            488593051648
0000220                       8                       0
0000240                       9            375972184064
0000260                      11                       0
0000300                      12                       0
0000320                      13                       0
0000340                      14                       0
0000360                      23                       0
0000400                      25            549220780840
0000420                      26                       0
0000440                      31            549220786153
0000460                      15            549220780856
0000500                       0                       0
0000520
$
```
But this is a lot easier to read:
```
$ adb shell LD_SHOW_AUXV=1 date
AT_SYSINFO_EHDR      0x7065010000
AT_MINSIGSTKSZ       4720
AT_HWCAP             0b100011001111111111111
AT_PAGESZ            4096
AT_CLKTCK            100
AT_PHDR              0x5c79d60040
AT_PHENT             56
AT_PHNUM             12
AT_BASE              0x7065011000
AT_FLAGS             0
AT_ENTRY             0x5c79da1000
AT_UID               0
AT_EUID              0
AT_GID               0
AT_EGID              0
AT_SECURE            0
AT_RANDOM            0x7ff814eb98
AT_HWCAP2            0
AT_EXECFN            "/system/bin/date"
AT_PLATFORM          "aarch64"
Tue Aug 22 20:43:22 GMT 2023
```

Test: adb shell LD_SHOW_AUXV=1 date
Change-Id: I51c4e8cbb799eb1dc360c9417cc6f82bebdcda73
2023-08-22 14:25:01 -07:00
..
img Publish the current draft of my ELF TLS doc 2018-11-09 15:24:16 -08:00
32-bit-abi.md Expand a little on the time_t situation. 2020-05-19 12:41:25 -07:00
clang_fortify_anatomy.md docs: add a clang_fortify_anatomy doc 2022-06-07 13:28:51 -07:00
defines.md Clarify the defines documentation further. 2023-05-18 17:10:37 +00:00
EINTR.md Add some documentation about EINTR. 2021-12-13 10:16:57 -08:00
elf-tls.md ELS TLS documentation: s/module/module_id/. 2023-04-03 14:31:37 +00:00
fdsan.md Clarify that fdsan wasn't "enforcing" in its first release. 2021-12-10 01:42:31 +00:00
fdtrack.md Say which API level fdsan/fdtrack appeared at. 2021-04-16 13:57:52 -07:00
libc_assembler.md More cleanup for #inclusivefixit. 2020-07-31 10:35:03 -07:00
native_allocator.md Fix the adb command to push the memory trace files. 2021-04-09 15:11:49 -07:00
NOTICE Fix/update notices. 2021-02-16 15:06:50 -08:00
status.md linker: add LD_SHOW_AUXV support. 2023-08-22 14:25:01 -07:00