Date: Sat, 2 Mar 2019 04:02:11 +0000 (UTC) From: Rebecca Cran <bcran@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r344718 - in head/stand/efi/loader/arch: arm i386 Message-ID: <201903020402.x2242B3V083002@repo.freebsd.org>
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Author: bcran Date: Sat Mar 2 04:02:11 2019 New Revision: 344718 URL: https://svnweb.freebsd.org/changeset/base/344718 Log: EFI: don't call printf after ExitBootServices, since it uses Boot Services ExitBootServices terminates all boot services including console access. Attempting to call printf afterwards can result in a crash, depending on the implementation. Move any printf statements to before we call bi_load, and remove any that depend on calling bi_load first. Reviewed by: imp, tsoome Differential Revision: https://reviews.freebsd.org/D19374 Modified: head/stand/efi/loader/arch/arm/exec.c head/stand/efi/loader/arch/i386/elf32_freebsd.c Modified: head/stand/efi/loader/arch/arm/exec.c ============================================================================== --- head/stand/efi/loader/arch/arm/exec.c Sat Mar 2 03:17:23 2019 (r344717) +++ head/stand/efi/loader/arch/arm/exec.c Sat Mar 2 04:02:11 2019 (r344718) @@ -74,16 +74,19 @@ __elfN(arm_exec)(struct preloaded_file *fp) e = (Elf_Ehdr *)&fmp->md_data; efi_time_fini(); + + entry = efi_translate(e->e_entry); + + printf("Kernel entry at 0x%x...\n", (unsigned)entry); + printf("Kernel args: %s\n", fp->f_args); + if ((error = bi_load(fp->f_args, &modulep, &kernend)) != 0) { efi_time_init(); return (error); } - entry = efi_translate(e->e_entry); - printf("Kernel entry at 0x%x...\n", (unsigned)entry); - printf("Kernel args: %s\n", fp->f_args); - printf("modulep: %#x\n", modulep); - printf("relocation_offset %llx\n", __elfN(relocation_offset)); + /* At this point we've called ExitBootServices, so we can't call + * printf or any other function that uses Boot Services */ dev_cleanup(); Modified: head/stand/efi/loader/arch/i386/elf32_freebsd.c ============================================================================== --- head/stand/efi/loader/arch/i386/elf32_freebsd.c Sat Mar 2 03:17:23 2019 (r344717) +++ head/stand/efi/loader/arch/i386/elf32_freebsd.c Sat Mar 2 04:02:11 2019 (r344718) @@ -75,14 +75,19 @@ elf32_exec(struct preloaded_file *fp) ehdr = (Elf_Ehdr *)&(md->md_data); efi_time_fini(); + + entry = ehdr->e_entry & 0xffffff; + + printf("Start @ 0x%x ...\n", entry); + err = bi_load(fp->f_args, &modulep, &kernend); if (err != 0) { efi_time_init(); return(err); } - entry = ehdr->e_entry & 0xffffff; - printf("Start @ 0x%x ...\n", entry); + /* At this point we've called ExitBootServices, so we can't call + * printf or any other function that uses Boot Services */ dev_cleanup(); __exec((void *)entry, boothowto, bootdev, 0, 0, 0, bootinfop, modulep, kernend);
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