The definition of "static const char *const syscalltbl[] = {" is done
in a generated syscalls_32.h or syscalls_64.h that is architecture
dependent. In order to include the appropriate file a syscall_table.h
is found via the perf include path and it includes the syscalls_32.h
or syscalls_64.h as app
Now a single beauty file is generated and used by all architectures,
remove the per-architecture Makefiles, Kbuild files and previous
generator script.
Note: there was conversation with Charlie Jenkins
and they'd written an alternate approach to
support multiple architectures:
https://lore.kernel
Arnd Bergmann described that MIPS system calls don't necessarily start
from 0 as an ABI prefix is applied:
https://lore.kernel.org/lkml/8ed7dfb2-1e4d-4aa4-a04b-0397a8936...@app.fastmail.com/
When decoding the "id" (aka system call number) for MIPS ignore values
greater-than 1000.
Signed-off-by: Ia
Switch to use the lookup table containing all architectures rather
than tables matching the perf binary.
This fixes perf trace when executed on a 32-bit i386 binary on an
x86-64 machine. Note in the following the system call names of the
32-bit i386 binary as seen by an x86-64 perf.
Before:
```
For ELF file dsos read the e_machine from the ELF header. For kernel
types assume the e_machine matches the perf tool. In other cases
return EM_NONE.
When reading from the ELF header use DSO__SWAP that may need
dso->needs_swap initializing. Factor out dso__swap_init to allow this.
Signed-off-by:
Rather than generating individual syscall header files generate a
single trace/beauty/generated/syscalltbl.c. In a syscalltbls array
have references to each architectures tables along with the
corresponding e_machine. When the 32-bit or 64-bit table is ambiguous,
match the perf binary's type. For A
First try to read the e_machine from the dsos associated with the
thread's maps. If live use the executable from /proc/pid/exe and read
the e_machine from the ELF header. On failure use EM_HOST. Change
builtin-trace syscall functions to pass e_machine from the thread
rather than EM_HOST, so that in
The syscalltbl held entries of system call name and number pairs,
generated from a native syscalltbl at start up. As there are gaps in
the system call number there is a notion of index into the
table. Going forward we want the system call table to be identifiable
by a machine type, for example, i38
Identify struct syscall information in the syscalls table by a machine
type and syscall number, not just system call number. Having the
machine type means that 32-bit system calls can be differentiated from
64-bit ones on a machine capable of both. Having a table for all
machine types and all syste
There are many and non-obvious meanings to the dso_binary_type enum
values. Add kernel-doc to speed interpretting their meanings.
Acked-by: Arnaldo Carvalho de Melo
Signed-off-by: Ian Rogers
---
tools/perf/util/dso.h | 53 +++
1 file changed, 53 insertion
The variables elf_base_addr, debug_frame_offset, eh_frame_hdr_addr and
eh_frame_hdr_offset are only accessed in unwind-libunwind-local.c
which is conditionally built on having libunwind support. Make the
variables conditional on libunwind support too.
Reviewed-by: Arnaldo Carvalho de Melo
Signed-
This work builds on the clean up of system call tables and removal of
libaudit by Charlie Jenkins .
The system call table in perf trace is used to map system call numbers
to names and vice versa. Prior to these changes, a single table
matching the perf binary's build was present. The table would b
On Thu, Mar 06, 2025 at 08:51:17PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)"
>
> Allocating the zero pages from memblock is simpler because the memory is
> already reserved.
>
> This will also help with pulling out memblock_free_all() to the generic
> code and reducing code
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