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[46.204.108.203]) by smtp.gmail.com with ESMTPSA id d11-20020ac25ecb000000b004cb3a55feacsm338760lfq.100.2023.03.03.02.38.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Mar 2023 02:38:34 -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: 8cad6d7a-b9af-11ed-96af-2f268f93b82a DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1677839914; 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=fUiRMVPR0ilpfT8Ki5uaE/L5ncki0uX/6QKrZCFiFtE=; b=F3oV1tXW3akzyk4y1Hd41DCm5wIO/YmVWNW40gcL/mU9jOQkA9XtoNn184cmjNyEdO C53/k+UofL13XkS46Lw9+HiT2HNIi0kfTMSek8wuwjHVaTOSm0R9xWsxAvfQqkp5f/yg sEhTkOCnALPTJywLe1v/cqyBtU7gxaKp5jt01qtdLujYeN2E0CDcWweOF3Ir6gB74eWf PVCAGFi7kVJEh9g2LHJSJ3xscSRFVMEF+dEzDHiwQmPDNzfT7f1crpy8PFe2V51hA/FX bmUTGgZgwm7A9tGyZqt16EX/BsgUqrMOeoNiTtoUfiQhYFxSAXJHNeuQ5V6dqQgNOLgX aA1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677839914; 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=fUiRMVPR0ilpfT8Ki5uaE/L5ncki0uX/6QKrZCFiFtE=; b=cADuxZA/1Z/YsP+gL5lAEaNYJ6syoq6Txg1a7heoUImOKPnyolJZSVJRFw142RrVyd J19G3EOVru3uL+x6nYkdkWQgWBZmjjLWW0mZrEvt1nh1+z0XXB29fLdzTJwG8QRcc30M HV00IzZ8Uoa7THCBNIEKpL0ia9DfUXdEnd36U9Y1ALZPLejOZ6Gwllz2h2EhT3VZu3uU 4+3ATX3UG2gUSQY7Zf3bj1HKIXxjBIGvtVKmOoZmOwOJlObQU7oEQHB/2sFf7Uw2L8Tt cLh+EORkVOgf7DiJfCBHp27B7/HIu/8hjIqgOUNcAalZ4nDxBT9yo0hdM7d+n0AeXst3 0VGg== X-Gm-Message-State: AO0yUKXlzMLay9YKCRFDM4ZeIgfiiDxoo+IJ6Yny9kuyZbPaWUtz4bP+ lb5TnB1aOEh8hzz0Q8dZ8xI/iJ/fHug= X-Google-Smtp-Source: AK7set/iZaFpQdjpJ/6luiC9gfz02zE1/t2IZW6zTNcaO9VgdL2599powdfaTIRtOycugQ7uVrL8ow== X-Received: by 2002:a05:6512:3b98:b0:4d8:86c1:477d with SMTP id g24-20020a0565123b9800b004d886c1477dmr1476662lfv.18.1677839914238; Fri, 03 Mar 2023 02:38:34 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Julien Grall , Jan Beulich , Andrew Cooper , Stefano Stabellini , Gianluca Guida , Oleksii Kurochko , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , Wei Liu Subject: [PATCH v5 4/4] xen/x86: switch x86 to use generic implemetation of bug.h Date: Fri, 3 Mar 2023 12:38:25 +0200 Message-Id: <4a478638449e66a76e1671db38ec29b9e3108201.1677839409.git.oleksii.kurochko@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 The following changes were made: * Make GENERIC_BUG_FRAME mandatory for X86 * Update asm/bug.h using generic implementation in * Change prototype of debugger_trap_fatal() in asm/debugger.h to align it with generic prototype in . * Update do_invalid_op using generic do_bug_frame() Signed-off-by: Oleksii Kurochko --- Changes in V5: * Nothing changed --- Changes in V4: * Back comment /* !__ASSEMBLY__ */ for #else case in * Remove changes related to x86/.../asm/debuger.h as do_bug_frame() prototype was updated and cpu_user_regs isn't const any more. --- Changes in V3: * As prototype and what do_bug_frame() returns was changed so patch 3 and 4 was updated to use a new version of do_bug_frame * MODIFIER was change to BUG_ASM_CONST to align with generic implementation --- Changes in V2: * Remove all unnecessary things from as they were introduced in . * Define BUG_INSTR = 'ud2' and MODIFIER = 'c' ( it is needed to skip '$' when use an imidiate in x86 assembly ) * Update do_invalid_op() to re-use handle_bug_frame() and find_bug_frame() from generic implemetation of CONFIG_GENERIC_BUG_FRAME * Code style fixes. --- xen/arch/x86/Kconfig | 1 + xen/arch/x86/include/asm/bug.h | 73 ++---------------------------- xen/arch/x86/traps.c | 81 +++------------------------------- 3 files changed, 11 insertions(+), 144 deletions(-) diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig index 6a7825f4ba..b0ff1f3ee6 100644 --- a/xen/arch/x86/Kconfig +++ b/xen/arch/x86/Kconfig @@ -11,6 +11,7 @@ config X86 select ARCH_MAP_DOMAIN_PAGE select ARCH_SUPPORTS_INT128 select CORE_PARKING + select GENERIC_BUG_FRAME select HAS_ALTERNATIVE select HAS_COMPAT select HAS_CPUFREQ diff --git a/xen/arch/x86/include/asm/bug.h b/xen/arch/x86/include/asm/bug.h index 79133e53e7..2a8d3f84b8 100644 --- a/xen/arch/x86/include/asm/bug.h +++ b/xen/arch/x86/include/asm/bug.h @@ -1,79 +1,12 @@ #ifndef __X86_BUG_H__ #define __X86_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 BUG_DEBUGGER_TRAP_FATAL(regs) debugger_trap_fatal(X86_EXC_GP,regs) #ifndef __ASSEMBLY__ -#define 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[]; -}; - -#define bug_loc(b) ((const void *)(b) + (b)->loc_disp) -#define bug_ptr(b) ((const void *)(b) + (b)->ptr_disp) -#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))) -#define bug_msg(b) ((const char *)(b) + (b)->msg_disp[1]) - -#define _ASM_BUGFRAME_TEXT(second_frame) \ - ".Lbug%=: ud2\n" \ - ".pushsection .bug_frames.%c[bf_type], \"a\", @progbits\n" \ - ".p2align 2\n" \ - ".Lfrm%=:\n" \ - ".long (.Lbug%= - .Lfrm%=) + %c[bf_line_hi]\n" \ - ".long (%c[bf_ptr] - .Lfrm%=) + %c[bf_line_lo]\n" \ - ".if " #second_frame "\n" \ - ".long 0, %c[bf_msg] - .Lfrm%=\n" \ - ".endif\n" \ - ".popsection\n" \ - -#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) - -#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) - - -#define WARN() BUG_FRAME(BUGFRAME_warn, __LINE__, __FILE__, 0, NULL) -#define BUG() do { \ - BUG_FRAME(BUGFRAME_bug, __LINE__, __FILE__, 0, NULL); \ - unreachable(); \ -} while (0) - -/* - * 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 ) - -#define assert_failed(msg) do { \ - BUG_FRAME(BUGFRAME_assert, __LINE__, __FILE__, 1, msg); \ - unreachable(); \ -} while (0) +#define BUG_INSTR "ud2" +#define BUG_ASM_CONST "c" #else /* !__ASSEMBLY__ */ diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c index cade9e12f8..7c33ebceff 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -24,6 +24,7 @@ * Gareth Hughes , May 2000 */ +#include #include #include #include @@ -1166,12 +1167,9 @@ void cpuid_hypervisor_leaves(const struct vcpu *v, uint32_t leaf, void do_invalid_op(struct cpu_user_regs *regs) { - const struct bug_frame *bug = NULL; u8 bug_insn[2]; - const char *prefix = "", *filename, *predicate, *eip = (char *)regs->rip; - unsigned long fixup; - int id = -1, lineno; - const struct virtual_region *region; + const char *eip = (char *)regs->rip; + int id; if ( likely(guest_mode(regs)) ) { @@ -1185,83 +1183,18 @@ void do_invalid_op(struct cpu_user_regs *regs) memcmp(bug_insn, "\xf\xb", sizeof(bug_insn)) ) goto die; - region = find_text_region(regs->rip); - 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) == eip ) - { - bug = b; - goto found; - } - } - } - } - - found: - if ( !bug ) + id = do_bug_frame(regs, regs->rip); + if ( id < 0 ) goto die; - eip += sizeof(bug_insn); - if ( id == BUGFRAME_run_fn ) - { - void (*fn)(struct cpu_user_regs *) = bug_ptr(bug); - - fn(regs); - fixup_exception_return(regs, (unsigned long)eip); - return; - } - /* WARN, BUG or ASSERT: decode the filename pointer and line number. */ - filename = bug_ptr(bug); - if ( !is_kernel(filename) && !is_patch(filename) ) - goto die; - fixup = strlen(filename); - if ( fixup > 50 ) - { - filename += fixup - 47; - prefix = "..."; - } - lineno = bug_line(bug); + eip += sizeof(bug_insn); switch ( id ) { + case BUGFRAME_run_fn: case BUGFRAME_warn: - printk("Xen WARN at %s%s:%d\n", prefix, filename, lineno); - show_execution_state(regs); fixup_exception_return(regs, (unsigned long)eip); return; - - case BUGFRAME_bug: - printk("Xen BUG at %s%s:%d\n", prefix, filename, lineno); - - if ( debugger_trap_fatal(TRAP_invalid_op, regs) ) - return; - - 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) && !is_patch(predicate) ) - predicate = ""; - - printk("Assertion '%s' failed at %s%s:%d\n", - predicate, prefix, filename, lineno); - - if ( debugger_trap_fatal(TRAP_invalid_op, regs) ) - return; - - show_execution_state(regs); - panic("Assertion '%s' failed at %s%s:%d\n", - predicate, prefix, filename, lineno); } die: