diff options
| -rw-r--r-- | target/linux/generic/backport-4.19/210-arm64-sve-Disentangle-uapi-asm-ptrace.h-from-uapi-as.patch | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.19/210-arm64-sve-Disentangle-uapi-asm-ptrace.h-from-uapi-as.patch b/target/linux/generic/backport-4.19/210-arm64-sve-Disentangle-uapi-asm-ptrace.h-from-uapi-as.patch new file mode 100644 index 0000000000..e638e07026 --- /dev/null +++ b/target/linux/generic/backport-4.19/210-arm64-sve-Disentangle-uapi-asm-ptrace.h-from-uapi-as.patch @@ -0,0 +1,280 @@ +From 9966a05c7b80f075f2bc7e48dbb108d3f2927234 Mon Sep 17 00:00:00 2001 +From: Dave Martin <Dave.Martin@arm.com> +Date: Fri, 4 Jan 2019 13:09:51 +0000 +Subject: [PATCH] arm64/sve: Disentangle <uapi/asm/ptrace.h> from + <uapi/asm/sigcontext.h> + +Currently, <uapi/asm/sigcontext.h> provides common definitions for +describing SVE context structures that are also used by the ptrace +definitions in <uapi/asm/ptrace.h>. + +For this reason, a #include of <asm/sigcontext.h> was added in +ptrace.h, but it this turns out that this can interact badly with +userspace code that tries to include ptrace.h on top of the libc +headers (which may provide their own shadow definitions for +sigcontext.h). + +To make the headers easier for userspace to consume, this patch +bounces the common definitions into an __SVE_* namespace and moves +them to a backend header <uapi/asm/sve_context.h> that can be +included by the other headers as appropriate. This should allow +ptrace.h to be used alongside libc's sigcontext.h (if any) without +ill effects. + +This should make the situation unambiguous: <asm/sigcontext.h> is +the header to include for the sigframe-specific definitions, while +<asm/ptrace.h> is the header to include for ptrace-specific +definitions. + +To avoid conflicting with existing usage, <asm/sigcontext.h> +remains the canonical way to get the common definitions for +SVE_VQ_MIN, sve_vq_from_vl() etc., both in userspace and in the +kernel: relying on these being defined as a side effect of +including just <asm/ptrace.h> was never intended to be safe. + +Signed-off-by: Dave Martin <Dave.Martin@arm.com> +Signed-off-by: Will Deacon <will.deacon@arm.com> +--- + arch/arm64/include/uapi/asm/ptrace.h | 39 ++++++++-------- + arch/arm64/include/uapi/asm/sigcontext.h | 56 +++++++++++------------ + arch/arm64/include/uapi/asm/sve_context.h | 53 +++++++++++++++++++++ + 3 files changed, 99 insertions(+), 49 deletions(-) + create mode 100644 arch/arm64/include/uapi/asm/sve_context.h + +--- a/arch/arm64/include/uapi/asm/ptrace.h ++++ b/arch/arm64/include/uapi/asm/ptrace.h +@@ -23,7 +23,7 @@ + #include <linux/types.h> + + #include <asm/hwcap.h> +-#include <asm/sigcontext.h> ++#include <asm/sve_context.h> + + + /* +@@ -128,9 +128,9 @@ struct user_sve_header { + */ + + /* Offset from the start of struct user_sve_header to the register data */ +-#define SVE_PT_REGS_OFFSET \ +- ((sizeof(struct user_sve_header) + (SVE_VQ_BYTES - 1)) \ +- / SVE_VQ_BYTES * SVE_VQ_BYTES) ++#define SVE_PT_REGS_OFFSET \ ++ ((sizeof(struct user_sve_header) + (__SVE_VQ_BYTES - 1)) \ ++ / __SVE_VQ_BYTES * __SVE_VQ_BYTES) + + /* + * The register data content and layout depends on the value of the +@@ -176,39 +176,36 @@ struct user_sve_header { + * Additional data might be appended in the future. + */ + +-#define SVE_PT_SVE_ZREG_SIZE(vq) SVE_SIG_ZREG_SIZE(vq) +-#define SVE_PT_SVE_PREG_SIZE(vq) SVE_SIG_PREG_SIZE(vq) +-#define SVE_PT_SVE_FFR_SIZE(vq) SVE_SIG_FFR_SIZE(vq) ++#define SVE_PT_SVE_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq) ++#define SVE_PT_SVE_PREG_SIZE(vq) __SVE_PREG_SIZE(vq) ++#define SVE_PT_SVE_FFR_SIZE(vq) __SVE_FFR_SIZE(vq) + #define SVE_PT_SVE_FPSR_SIZE sizeof(__u32) + #define SVE_PT_SVE_FPCR_SIZE sizeof(__u32) + +-#define __SVE_SIG_TO_PT(offset) \ +- ((offset) - SVE_SIG_REGS_OFFSET + SVE_PT_REGS_OFFSET) +- + #define SVE_PT_SVE_OFFSET SVE_PT_REGS_OFFSET + + #define SVE_PT_SVE_ZREGS_OFFSET \ +- __SVE_SIG_TO_PT(SVE_SIG_ZREGS_OFFSET) ++ (SVE_PT_REGS_OFFSET + __SVE_ZREGS_OFFSET) + #define SVE_PT_SVE_ZREG_OFFSET(vq, n) \ +- __SVE_SIG_TO_PT(SVE_SIG_ZREG_OFFSET(vq, n)) ++ (SVE_PT_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n)) + #define SVE_PT_SVE_ZREGS_SIZE(vq) \ +- (SVE_PT_SVE_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET) ++ (SVE_PT_SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - SVE_PT_SVE_ZREGS_OFFSET) + + #define SVE_PT_SVE_PREGS_OFFSET(vq) \ +- __SVE_SIG_TO_PT(SVE_SIG_PREGS_OFFSET(vq)) ++ (SVE_PT_REGS_OFFSET + __SVE_PREGS_OFFSET(vq)) + #define SVE_PT_SVE_PREG_OFFSET(vq, n) \ +- __SVE_SIG_TO_PT(SVE_SIG_PREG_OFFSET(vq, n)) ++ (SVE_PT_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n)) + #define SVE_PT_SVE_PREGS_SIZE(vq) \ +- (SVE_PT_SVE_PREG_OFFSET(vq, SVE_NUM_PREGS) - \ ++ (SVE_PT_SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - \ + SVE_PT_SVE_PREGS_OFFSET(vq)) + + #define SVE_PT_SVE_FFR_OFFSET(vq) \ +- __SVE_SIG_TO_PT(SVE_SIG_FFR_OFFSET(vq)) ++ (SVE_PT_REGS_OFFSET + __SVE_FFR_OFFSET(vq)) + + #define SVE_PT_SVE_FPSR_OFFSET(vq) \ + ((SVE_PT_SVE_FFR_OFFSET(vq) + SVE_PT_SVE_FFR_SIZE(vq) + \ +- (SVE_VQ_BYTES - 1)) \ +- / SVE_VQ_BYTES * SVE_VQ_BYTES) ++ (__SVE_VQ_BYTES - 1)) \ ++ / __SVE_VQ_BYTES * __SVE_VQ_BYTES) + #define SVE_PT_SVE_FPCR_OFFSET(vq) \ + (SVE_PT_SVE_FPSR_OFFSET(vq) + SVE_PT_SVE_FPSR_SIZE) + +@@ -219,8 +216,8 @@ struct user_sve_header { + + #define SVE_PT_SVE_SIZE(vq, flags) \ + ((SVE_PT_SVE_FPCR_OFFSET(vq) + SVE_PT_SVE_FPCR_SIZE \ +- - SVE_PT_SVE_OFFSET + (SVE_VQ_BYTES - 1)) \ +- / SVE_VQ_BYTES * SVE_VQ_BYTES) ++ - SVE_PT_SVE_OFFSET + (__SVE_VQ_BYTES - 1)) \ ++ / __SVE_VQ_BYTES * __SVE_VQ_BYTES) + + #define SVE_PT_SIZE(vq, flags) \ + (((flags) & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE ? \ +--- a/arch/arm64/include/uapi/asm/sigcontext.h ++++ b/arch/arm64/include/uapi/asm/sigcontext.h +@@ -130,6 +130,8 @@ struct sve_context { + + #endif /* !__ASSEMBLY__ */ + ++#include <asm/sve_context.h> ++ + /* + * The SVE architecture leaves space for future expansion of the + * vector length beyond its initial architectural limit of 2048 bits +@@ -138,21 +140,20 @@ struct sve_context { + * See linux/Documentation/arm64/sve.txt for a description of the VL/VQ + * terminology. + */ +-#define SVE_VQ_BYTES 16 /* number of bytes per quadword */ ++#define SVE_VQ_BYTES __SVE_VQ_BYTES /* bytes per quadword */ + +-#define SVE_VQ_MIN 1 +-#define SVE_VQ_MAX 512 ++#define SVE_VQ_MIN __SVE_VQ_MIN ++#define SVE_VQ_MAX __SVE_VQ_MAX + +-#define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES) +-#define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES) ++#define SVE_VL_MIN __SVE_VL_MIN ++#define SVE_VL_MAX __SVE_VL_MAX + +-#define SVE_NUM_ZREGS 32 +-#define SVE_NUM_PREGS 16 ++#define SVE_NUM_ZREGS __SVE_NUM_ZREGS ++#define SVE_NUM_PREGS __SVE_NUM_PREGS + +-#define sve_vl_valid(vl) \ +- ((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX) +-#define sve_vq_from_vl(vl) ((vl) / SVE_VQ_BYTES) +-#define sve_vl_from_vq(vq) ((vq) * SVE_VQ_BYTES) ++#define sve_vl_valid(vl) __sve_vl_valid(vl) ++#define sve_vq_from_vl(vl) __sve_vq_from_vl(vl) ++#define sve_vl_from_vq(vq) __sve_vl_from_vq(vq) + + /* + * If the SVE registers are currently live for the thread at signal delivery, +@@ -205,34 +206,33 @@ struct sve_context { + * Additional data might be appended in the future. + */ + +-#define SVE_SIG_ZREG_SIZE(vq) ((__u32)(vq) * SVE_VQ_BYTES) +-#define SVE_SIG_PREG_SIZE(vq) ((__u32)(vq) * (SVE_VQ_BYTES / 8)) +-#define SVE_SIG_FFR_SIZE(vq) SVE_SIG_PREG_SIZE(vq) ++#define SVE_SIG_ZREG_SIZE(vq) __SVE_ZREG_SIZE(vq) ++#define SVE_SIG_PREG_SIZE(vq) __SVE_PREG_SIZE(vq) ++#define SVE_SIG_FFR_SIZE(vq) __SVE_FFR_SIZE(vq) + + #define SVE_SIG_REGS_OFFSET \ +- ((sizeof(struct sve_context) + (SVE_VQ_BYTES - 1)) \ +- / SVE_VQ_BYTES * SVE_VQ_BYTES) ++ ((sizeof(struct sve_context) + (__SVE_VQ_BYTES - 1)) \ ++ / __SVE_VQ_BYTES * __SVE_VQ_BYTES) + +-#define SVE_SIG_ZREGS_OFFSET SVE_SIG_REGS_OFFSET ++#define SVE_SIG_ZREGS_OFFSET \ ++ (SVE_SIG_REGS_OFFSET + __SVE_ZREGS_OFFSET) + #define SVE_SIG_ZREG_OFFSET(vq, n) \ +- (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREG_SIZE(vq) * (n)) +-#define SVE_SIG_ZREGS_SIZE(vq) \ +- (SVE_SIG_ZREG_OFFSET(vq, SVE_NUM_ZREGS) - SVE_SIG_ZREGS_OFFSET) ++ (SVE_SIG_REGS_OFFSET + __SVE_ZREG_OFFSET(vq, n)) ++#define SVE_SIG_ZREGS_SIZE(vq) __SVE_ZREGS_SIZE(vq) + + #define SVE_SIG_PREGS_OFFSET(vq) \ +- (SVE_SIG_ZREGS_OFFSET + SVE_SIG_ZREGS_SIZE(vq)) ++ (SVE_SIG_REGS_OFFSET + __SVE_PREGS_OFFSET(vq)) + #define SVE_SIG_PREG_OFFSET(vq, n) \ +- (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREG_SIZE(vq) * (n)) +-#define SVE_SIG_PREGS_SIZE(vq) \ +- (SVE_SIG_PREG_OFFSET(vq, SVE_NUM_PREGS) - SVE_SIG_PREGS_OFFSET(vq)) ++ (SVE_SIG_REGS_OFFSET + __SVE_PREG_OFFSET(vq, n)) ++#define SVE_SIG_PREGS_SIZE(vq) __SVE_PREGS_SIZE(vq) + + #define SVE_SIG_FFR_OFFSET(vq) \ +- (SVE_SIG_PREGS_OFFSET(vq) + SVE_SIG_PREGS_SIZE(vq)) ++ (SVE_SIG_REGS_OFFSET + __SVE_FFR_OFFSET(vq)) + + #define SVE_SIG_REGS_SIZE(vq) \ +- (SVE_SIG_FFR_OFFSET(vq) + SVE_SIG_FFR_SIZE(vq) - SVE_SIG_REGS_OFFSET) +- +-#define SVE_SIG_CONTEXT_SIZE(vq) (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq)) ++ (__SVE_FFR_OFFSET(vq) + __SVE_FFR_SIZE(vq)) + ++#define SVE_SIG_CONTEXT_SIZE(vq) \ ++ (SVE_SIG_REGS_OFFSET + SVE_SIG_REGS_SIZE(vq)) + + #endif /* _UAPI__ASM_SIGCONTEXT_H */ +--- /dev/null ++++ b/arch/arm64/include/uapi/asm/sve_context.h +@@ -0,0 +1,53 @@ ++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ ++/* Copyright (C) 2017-2018 ARM Limited */ ++ ++/* ++ * For use by other UAPI headers only. ++ * Do not make direct use of header or its definitions. ++ */ ++ ++#ifndef _UAPI__ASM_SVE_CONTEXT_H ++#define _UAPI__ASM_SVE_CONTEXT_H ++ ++#include <linux/types.h> ++ ++#define __SVE_VQ_BYTES 16 /* number of bytes per quadword */ ++ ++#define __SVE_VQ_MIN 1 ++#define __SVE_VQ_MAX 512 ++ ++#define __SVE_VL_MIN (__SVE_VQ_MIN * __SVE_VQ_BYTES) ++#define __SVE_VL_MAX (__SVE_VQ_MAX * __SVE_VQ_BYTES) ++ ++#define __SVE_NUM_ZREGS 32 ++#define __SVE_NUM_PREGS 16 ++ ++#define __sve_vl_valid(vl) \ ++ ((vl) % __SVE_VQ_BYTES == 0 && \ ++ (vl) >= __SVE_VL_MIN && \ ++ (vl) <= __SVE_VL_MAX) ++ ++#define __sve_vq_from_vl(vl) ((vl) / __SVE_VQ_BYTES) ++#define __sve_vl_from_vq(vq) ((vq) * __SVE_VQ_BYTES) ++ ++#define __SVE_ZREG_SIZE(vq) ((__u32)(vq) * __SVE_VQ_BYTES) ++#define __SVE_PREG_SIZE(vq) ((__u32)(vq) * (__SVE_VQ_BYTES / 8)) ++#define __SVE_FFR_SIZE(vq) __SVE_PREG_SIZE(vq) ++ ++#define __SVE_ZREGS_OFFSET 0 ++#define __SVE_ZREG_OFFSET(vq, n) \ ++ (__SVE_ZREGS_OFFSET + __SVE_ZREG_SIZE(vq) * (n)) ++#define __SVE_ZREGS_SIZE(vq) \ ++ (__SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - __SVE_ZREGS_OFFSET) ++ ++#define __SVE_PREGS_OFFSET(vq) \ ++ (__SVE_ZREGS_OFFSET + __SVE_ZREGS_SIZE(vq)) ++#define __SVE_PREG_OFFSET(vq, n) \ ++ (__SVE_PREGS_OFFSET(vq) + __SVE_PREG_SIZE(vq) * (n)) ++#define __SVE_PREGS_SIZE(vq) \ ++ (__SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - __SVE_PREGS_OFFSET(vq)) ++ ++#define __SVE_FFR_OFFSET(vq) \ ++ (__SVE_PREGS_OFFSET(vq) + __SVE_PREGS_SIZE(vq)) ++ ++#endif /* ! _UAPI__ASM_SVE_CONTEXT_H */ |