From: "Maciej W. Rozycki" <macro@wdc.com>
To: Alistair Francis <alistair.francis@wdc.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH v2 07/18] RISC-V: nptl: update default pthread-offsets.h
Date: Thu, 9 Jul 2020 01:14:15 +0100 (BST) [thread overview]
Message-ID: <alpine.LFD.2.21.2007082358500.24175@redsun52.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <25ef7709e4468a35cc42607cfc0f233d4cec3c25.1591201405.git.alistair.francis@wdc.com>
On Wed, 3 Jun 2020, Alistair Francis via Libc-alpha wrote:
> diff --git a/sysdeps/riscv/nptl/pthread-offsets.h b/sysdeps/riscv/nptl/pthread-offsets.h
> index 31f0587bec..a85c752a1f 100644
> --- a/sysdeps/riscv/nptl/pthread-offsets.h
> +++ b/sysdeps/riscv/nptl/pthread-offsets.h
> @@ -1,3 +1,12 @@
> -#define __PTHREAD_MUTEX_KIND_OFFSET 16
> +#if __WORDSIZE == 64
> +# define __PTHREAD_MUTEX_KIND_OFFSET 16
> +#else
> +# define __PTHREAD_MUTEX_KIND_OFFSET 12
> +#endif
OK, we have:
typedef union
{
struct __pthread_mutex_s __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
} pthread_mutex_t;
and then:
struct __pthread_mutex_s
{
int __lock __LOCK_ALIGNMENT;
unsigned int __count;
int __owner;
#if __WORDSIZE == 64
unsigned int __nusers;
#endif
int __kind;
#if __WORDSIZE != 64
unsigned int __nusers;
#endif
which means the `__nusers' and `__kind' members are swapped between 64-bit
and 32-bit hosts. Which I find kind of weird (what for?), but the offset
of `__kind' changes accordingly and the values are correct.
> -#define __PTHREAD_RWLOCK_FLAGS_OFFSET 48
> +
> +#if __WORDSIZE == 64
> +# define __PTHREAD_RWLOCK_FLAGS_OFFSET 48
> +#else
> +# define __PTHREAD_RWLOCK_FLAGS_OFFSET 24
> +#endif
Likewise (as from 09/18):
typedef union
{
struct __pthread_rwlock_arch_t __data;
char __size[__SIZEOF_PTHREAD_RWLOCK_T];
long int __align;
} pthread_rwlock_t;
and:
struct __pthread_rwlock_arch_t
{
unsigned int __readers;
unsigned int __writers;
unsigned int __wrphase_futex;
unsigned int __writers_futex;
unsigned int __pad3;
unsigned int __pad4;
#if __riscv_xlen == 64
int __cur_writer;
int __shared;
unsigned long int __pad1;
unsigned long int __pad2;
unsigned int __flags;
#else
# if __BYTE_ORDER == __BIG_ENDIAN
unsigned char __pad1;
unsigned char __pad2;
unsigned char __shared;
unsigned char __flags;
# else
unsigned char __flags;
unsigned char __shared;
unsigned char __pad1;
unsigned char __pad2;
# endif
int __cur_writer;
#endif
};
so here we have 48 for RV64, 24 for RV32/LE, and 27 for RV/BE, meaning
that your change is wrong. Please fix that.
Also I think this change makes no sense at this point or indeed on its
own as there's been no RV32 support added to <bits/struct_rwlock.h> as at
this commit yet, meaning that the offsets would become inconsistent.
Please fold it into 09/18.
Maciej
next prev parent reply other threads:[~2020-07-09 0:14 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 16:25 [PATCH v2 00/18] glibc port for 32-bit RISC-V (RV32) Alistair Francis
2020-06-03 16:25 ` [PATCH v2 01/18] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Alistair Francis
2020-07-07 22:06 ` Maciej W. Rozycki
2020-07-10 15:27 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 02/18] RISC-V: Define __NR_* as __NR_*_time64/64 for 32-bit Alistair Francis
2020-07-08 0:09 ` Maciej W. Rozycki
2020-07-08 17:08 ` Adhemerval Zanella
2020-07-09 17:14 ` Alistair Francis
2020-07-16 0:23 ` Maciej W. Rozycki
2020-07-09 17:10 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 03/18] RISC-V: Add support for 32-bit vDSO calls Alistair Francis
2020-07-08 1:01 ` Maciej W. Rozycki
2020-07-08 18:17 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 04/18] RISC-V: Support dynamic loader for the 32-bit Alistair Francis
2020-07-08 1:35 ` Maciej W. Rozycki
2020-06-03 16:25 ` [PATCH v2 05/18] RISC-V: Add path of library directories " Alistair Francis
2020-07-08 18:42 ` Maciej W. Rozycki
2020-07-09 17:03 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 06/18] RISC-V: Add arch-syscall.h for RV32 Alistair Francis
2020-07-08 19:33 ` Maciej W. Rozycki
2020-06-03 16:25 ` [PATCH v2 07/18] RISC-V: nptl: update default pthread-offsets.h Alistair Francis
2020-07-09 0:14 ` Maciej W. Rozycki [this message]
2020-07-09 11:47 ` Adhemerval Zanella
2020-07-15 19:23 ` Maciej W. Rozycki
2020-08-10 17:34 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 08/18] riscv32: Add an architecture ipctypes.h Alistair Francis
2020-07-09 2:46 ` Maciej W. Rozycki
2020-07-09 11:36 ` Adhemerval Zanella
2020-06-03 16:25 ` [PATCH v2 09/18] RISC-V: The ABI implementation for 32-bit Alistair Francis
2020-07-09 23:33 ` Maciej W. Rozycki
2020-07-10 16:45 ` Alistair Francis
2020-07-11 1:24 ` Maciej W. Rozycki
2020-08-10 21:29 ` Alistair Francis
2020-08-27 19:43 ` Adhemerval Zanella
2020-09-25 23:03 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 10/18] RISC-V: Hard float support " Alistair Francis
2020-07-11 0:49 ` Maciej W. Rozycki
2020-07-11 15:49 ` Alistair Francis
2020-07-11 22:13 ` Maciej W. Rozycki
2020-07-12 15:34 ` Alistair Francis
2020-07-12 22:10 ` Maciej W. Rozycki
2020-08-27 18:36 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 11/18] RISC-V: Add ABI lists Alistair Francis
2020-07-12 20:54 ` Maciej W. Rozycki
2020-07-13 16:14 ` Alistair Francis
2020-06-03 16:25 ` [PATCH v2 12/18] RISC-V: Add the RV32 libm-test-ulps Alistair Francis
2020-06-03 17:34 ` Joseph Myers
2020-06-05 4:01 ` Alistair Francis
2020-06-03 16:26 ` [PATCH v2 13/18] RISC-V: Fix llrint and llround missing exceptions on RV32 Alistair Francis
2020-06-03 16:26 ` [PATCH v2 14/18] RISC-V: Build Infastructure for 32-bit Alistair Francis
2020-06-03 16:26 ` [PATCH v2 15/18] riscv32: Specify the arch_minimum_kernel as 5.4 Alistair Francis
2020-06-03 16:26 ` [PATCH v2 16/18] RISC-V: Add rv32 path to RTLDLIST in ldd Alistair Francis
2020-06-03 16:26 ` [PATCH v2 17/18] Documentation for the RISC-V 32-bit port Alistair Francis
2020-06-03 16:26 ` [PATCH v2 18/18] Add RISC-V 32-bit target to build-many-glibcs.py Alistair Francis
2020-06-15 22:37 ` [PATCH v2 00/18] glibc port for 32-bit RISC-V (RV32) Alistair Francis
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