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[46.204.108.92]) by smtp.gmail.com with ESMTPSA id f8-20020a2e6a08000000b002934d555783sm65798ljc.6.2023.02.20.08.41.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Feb 2023 08:41:07 -0800 (PST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 60147f3f-b13d-11ed-933d-83870f6b2ba8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=QRAP5KqQXYqAUnB17tHsxH6vdQ6lhjVqsW3lN6eZV4Y=; b=SYhVFq1KNWKNHzP99mNP54m4dLKi/BDsJP7iTrd+If6fwXFSvjeAGA1WSTw2cVXyXl pmuG9MGMnVXv+AaINVfCvOelfOf80k+gQo9rTy8ZZT7DZoeIRSanzTnoU+nwUQu6aScH DsuVSmq2YfmMXaM2/3V0H57Vg763TzoqJh7Ev5IIfu8zxbzDHentDVODxBmeOWp/7I6K +Eiw7VetcdAt4sY7L1AMqTMgG/L0n1Itm6puuiXcqZWAlR+i2zy0cbJkzlnDfJOz45+K ECQiENnnAJPpVMB98msRgRX/50b+em4jA7jiDK66Xa+I3mP6RmJkitj9JkwQLFfq/Ew+ gy9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=QRAP5KqQXYqAUnB17tHsxH6vdQ6lhjVqsW3lN6eZV4Y=; b=tumk9muWxEyMEeVniu/3M3I3nAjpNIG59aEdGdEoFk2wGkZJuxa64lnEbjhJ3sISy7 OnhreChGSsNjLSukCpFe2rC6GCM1yuw4zYNafFvmfamLrO0BNmKwTXsPR4xpeSZYSCtM nADaY+Wxbs0v0q2NoYCOKB9pRRR2OP6qFE3TsdX+sJVHdHqq7DYQpdA5qU/xiu1wuEGK uCKeIAjeQ+wBGjtJUC3lkNdgovXprFuz970Gs3Yj3ByMkU5eXi2GDWMYLJ1W7zZrO4Wi SNQeLqpT6mwpPOWfZC9x54Fd2a7+/So7yTRgm/5AeMcV2EuYlcTazSXqnr/Tgz8rKxcl KJIw== X-Gm-Message-State: AO0yUKUVwCdRON96L/H7UQoUHDF7c4u+e8WSArYwG9Jr6stneEyLCoAp 2ftprHNRbYm1EnFNes0SgblMY+rk9Cc= X-Google-Smtp-Source: AK7set9SWDvh2MqHKwEbdHQ91ctqf9v82DKc6GEWskqkDFUTB7n/ByGNtMv3bd0dVnQW0vANDstqAw== X-Received: by 2002:a2e:9599:0:b0:290:6500:40f0 with SMTP id w25-20020a2e9599000000b00290650040f0mr696117ljh.42.1676911267595; Mon, 20 Feb 2023 08:41:07 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Jan Beulich , Andrew Cooper , Stefano Stabellini , Gianluca Guida , Oleksii Kurochko , George Dunlap , Julien Grall , Wei Liu Subject: [PATCH v2 1/4] xen: introduce CONFIG_GENERIC_BUG_FRAME Date: Mon, 20 Feb 2023 18:40:57 +0200 Message-Id: X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 A large part of the content of the bug.h is repeated among all architectures, so it was decided to create a new config CONFIG_GENERIC_BUG_FRAME. The version of from x86 was taken as the base version. The patch introduces the following stuff: * common bug.h header * generic implementation of do_bug_frame() * new config CONFIG_GENERIC_BUG_FRAME Signed-off-by: Oleksii Kurochko --- Changes in V2: - Switch to x86 implementation as generic as it is more compact ( at least from the point of view of bug frame structure ). - Rename CONFIG_GENERIC_DO_BUG_FRAME to CONFIG_GENERIC_BUG_FRAME. - Change the macro bug_loc(b) to avoid the need for a cast: #define bug_loc(b) ((unsigned long)(b) + (b)->loc_disp) - Rename BUG_FRAME_STUFF to BUG_FRAME_STRUCT - Make macros related to bug frame structure more generic. - Introduce BUG_INSTR and MODIFIER to make _ASM_BUGFRAME_TEXT reusable between x86 and RISC-V. - Rework do_bug_frame() and introduce find_bug_frame() and handle_bug_frame() functions to make it reusable by x86. - code style fixes --- xen/common/Kconfig | 3 + xen/common/Makefile | 1 + xen/common/bug.c | 113 +++++++++++++++++++++++++++++ xen/include/xen/bug.h | 161 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 278 insertions(+) create mode 100644 xen/common/bug.c create mode 100644 xen/include/xen/bug.h diff --git a/xen/common/Kconfig b/xen/common/Kconfig index f1ea3199c8..b226323537 100644 --- a/xen/common/Kconfig +++ b/xen/common/Kconfig @@ -28,6 +28,9 @@ config ALTERNATIVE_CALL config ARCH_MAP_DOMAIN_PAGE bool +config GENERIC_BUG_FRAME + bool + config HAS_ALTERNATIVE bool diff --git a/xen/common/Makefile b/xen/common/Makefile index bbd75b4be6..46049eac35 100644 --- a/xen/common/Makefile +++ b/xen/common/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_ARGO) += argo.o obj-y += bitmap.o +obj-$(CONFIG_GENERIC_BUG_FRAME) += bug.o obj-$(CONFIG_HYPFS_CONFIG) += config_data.o obj-$(CONFIG_CORE_PARKING) += core_parking.o obj-y += cpu.o diff --git a/xen/common/bug.c b/xen/common/bug.c new file mode 100644 index 0000000000..5eab3ebb53 --- /dev/null +++ b/xen/common/bug.c @@ -0,0 +1,113 @@ +#include +#include +#include +#include +#include +#include +#include + +#include + +const struct bug_frame* find_bug_frame(unsigned long pc, unsigned int *id) +{ + const struct bug_frame *bug = NULL; + const struct virtual_region *region; + + region = find_text_region(pc); + if ( region ) + { + for ( *id = 0; *id < BUGFRAME_NR; (*id)++ ) + { + const struct bug_frame *b; + unsigned int i; + + for ( i = 0, b = region->frame[*id].bugs; + i < region->frame[*id].n_bugs; b++, i++ ) + { + if ( bug_loc(b) == pc ) + { + bug = b; + goto found; + } + } + } + } + + found: + return bug; +} + +int handle_bug_frame(const struct cpu_user_regs *regs, + const struct bug_frame *bug, + unsigned int id) +{ + const char *prefix = "", *filename, *predicate; + unsigned long fixup; + unsigned int lineno; + + if ( id == BUGFRAME_run_fn ) + { +#ifdef ARM + void (*fn)(const struct cpu_user_regs *) = (void *)regs->BUG_FN_REG; +#else + void (*fn)(const struct cpu_user_regs *) = bug_ptr(bug); +#endif + + fn(regs); + return 0; + } + + /* WARN, BUG or ASSERT: decode the filename pointer and line number. */ + filename = bug_ptr(bug); + if ( !is_kernel(filename) && !is_patch(filename) ) + return -EINVAL; + fixup = strlen(filename); + if ( fixup > 50 ) + { + filename += fixup - 47; + prefix = "..."; + } + lineno = bug_line(bug); + + switch ( id ) + { + case BUGFRAME_warn: + printk("Xen WARN at %s%s:%d\n", prefix, filename, lineno); + show_execution_state(regs); + return 0; + + case BUGFRAME_bug: + printk("Xen BUG at %s%s:%d\n", prefix, filename, lineno); + + show_execution_state(regs); + panic("Xen BUG at %s%s:%d\n", prefix, filename, lineno); + + case BUGFRAME_assert: + /* ASSERT: decode the predicate string pointer. */ + predicate = bug_msg(bug); + if ( !is_kernel(predicate) ) + predicate = ""; + + printk("Assertion '%s' failed at %s%s:%d\n", + predicate, prefix, filename, lineno); + + show_execution_state(regs); + panic("Assertion '%s' failed at %s%s:%d\n", + predicate, prefix, filename, lineno); + } + + return -EINVAL; +} + +int do_bug_frame(const struct cpu_user_regs *regs, unsigned long pc) +{ + const struct bug_frame *bug = NULL; + unsigned int id; + + bug = find_bug_frame(pc, &id); + if (!bug) + return -ENOENT; + + return handle_bug_frame(regs, bug, id); +} + diff --git a/xen/include/xen/bug.h b/xen/include/xen/bug.h new file mode 100644 index 0000000000..4aedebeb18 --- /dev/null +++ b/xen/include/xen/bug.h @@ -0,0 +1,161 @@ +#ifndef __XEN_BUG_H__ +#define __XEN_BUG_H__ + +#define BUG_DISP_WIDTH 24 +#define BUG_LINE_LO_WIDTH (31 - BUG_DISP_WIDTH) +#define BUG_LINE_HI_WIDTH (31 - BUG_DISP_WIDTH) + +#define BUGFRAME_run_fn 0 +#define BUGFRAME_warn 1 +#define BUGFRAME_bug 2 +#define BUGFRAME_assert 3 + +#define BUGFRAME_NR 4 + +#ifndef __ASSEMBLY__ + +#include +#include +#include +#include + +#include + +#ifndef BUG_FRAME_STRUCT + +struct bug_frame { + signed int loc_disp:BUG_DISP_WIDTH; + unsigned int line_hi:BUG_LINE_HI_WIDTH; + signed int ptr_disp:BUG_DISP_WIDTH; + unsigned int line_lo:BUG_LINE_LO_WIDTH; + signed int msg_disp[]; +}; + +#endif /* BUG_FRAME_STRUCT */ + +#ifndef bug_loc +#define bug_loc(b) ((unsigned long)(b) + (b)->loc_disp) +#endif /* bug_loc */ + +#ifndef bug_ptr +#define bug_ptr(b) ((const void *)(b) + (b)->ptr_disp) +#endif /* bug_ptr */ + +#ifndef bug_line +#define bug_line(b) (((((b)->line_hi + ((b)->loc_disp < 0)) & \ + ((1 << BUG_LINE_HI_WIDTH) - 1)) << \ + BUG_LINE_LO_WIDTH) + \ + (((b)->line_lo + ((b)->ptr_disp < 0)) & \ + ((1 << BUG_LINE_LO_WIDTH) - 1))) +#endif /* bug_line */ + +#ifndef bug_msg +#define bug_msg(b) ((const char *)(b) + (b)->msg_disp[1]) +#endif /* bug_msg */ + +#ifndef _ASM_BUGFRAME_TEXT + +#define _ASM_BUGFRAME_TEXT(second_frame) \ + ".Lbug%=:"BUG_INSTR"\n" \ + ".pushsection .bug_frames.%"MODIFIER"[bf_type], \"a\", @progbits\n" \ + ".p2align 2\n" \ + ".Lfrm%=:\n" \ + ".long (.Lbug%= - .Lfrm%=) + %"MODIFIER"[bf_line_hi]\n" \ + ".long (%"MODIFIER"[bf_ptr] - .Lfrm%=) + %"MODIFIER"[bf_line_lo]\n" \ + ".if " #second_frame "\n" \ + ".long 0, %"MODIFIER"[bf_msg] - .Lfrm%=\n" \ + ".endif\n" \ + ".popsection\n" + +#endif /* _ASM_BUGFRAME_TEXT */ + +#ifndef _ASM_BUGFRAME_INFO + +#define _ASM_BUGFRAME_INFO(type, line, ptr, msg) \ + [bf_type] "i" (type), \ + [bf_ptr] "i" (ptr), \ + [bf_msg] "i" (msg), \ + [bf_line_lo] "i" ((line & ((1 << BUG_LINE_LO_WIDTH) - 1)) \ + << BUG_DISP_WIDTH), \ + [bf_line_hi] "i" (((line) >> BUG_LINE_LO_WIDTH) << BUG_DISP_WIDTH) + +#endif /* _ASM_BUGFRAME_INFO */ + +#ifndef BUG_FRAME + +#define BUG_FRAME(type, line, ptr, second_frame, msg) do { \ + BUILD_BUG_ON((line) >> (BUG_LINE_LO_WIDTH + BUG_LINE_HI_WIDTH)); \ + BUILD_BUG_ON((type) >= BUGFRAME_NR); \ + asm volatile ( _ASM_BUGFRAME_TEXT(second_frame) \ + :: _ASM_BUGFRAME_INFO(type, line, ptr, msg) ); \ +} while (0) + +#endif + +#ifndef run_in_exception_handler + +/* + * TODO: untangle header dependences, break BUILD_BUG_ON() out of xen/lib.h, + * and use a real static inline here to get proper type checking of fn(). + */ +#define run_in_exception_handler(fn) \ + do { \ + (void)((fn) == (void (*)(struct cpu_user_regs *))NULL); \ + BUG_FRAME(BUGFRAME_run_fn, 0, fn, 0, NULL); \ + } while ( 0 ) + +#endif /* run_in_exception_handler */ + +#ifndef WARN +#define WARN() BUG_FRAME(BUGFRAME_warn, __LINE__, __FILE__, 0, NULL) +#endif /* WARN */ + +#ifndef BUG +#define BUG() do { \ + BUG_FRAME(BUGFRAME_bug, __LINE__, __FILE__, 0, NULL); \ + unreachable(); \ +} while (0) +#endif + +#ifndef assert_failed +#define assert_failed(msg) do { \ + BUG_FRAME(BUGFRAME_assert, __LINE__, __FILE__, 1, msg); \ + unreachable(); \ +} while (0) +#endif + +#ifdef CONFIG_GENERIC_BUG_FRAME + +struct cpu_user_regs; + +const struct bug_frame* find_bug_frame(unsigned long pc, unsigned int *id); + +int handle_bug_frame(const struct cpu_user_regs *regs, + const struct bug_frame *bug, + unsigned int id); + +int do_bug_frame(const struct cpu_user_regs *regs, unsigned long pc); + +#endif /* CONFIG_GENERIC_BUG_FRAME */ + +extern const struct bug_frame __start_bug_frames[], + __stop_bug_frames_0[], + __stop_bug_frames_1[], + __stop_bug_frames_2[], + __stop_bug_frames_3[]; + +#else /* !__ASSEMBLY__ */ + +#include + +#endif /* __ASSEMBLY__ */ + +#endif /* __XEN_BUG_H__ */ +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */