From eee3820bb0584c0eaa59e82a5cc8399134222215 Mon Sep 17 00:00:00 2001 From: Eli Zaretskii Date: Sun, 8 Jul 2001 10:28:20 +0000 Subject: [PATCH] * go32-nat.c (go32_get_windows_version, print_mem, go32_sysinfo) (read_memory_region, get_descriptor, display_descriptor) (go32_sldt, go32_sgdt, go32_sidt): New functions. (top-level): Include ctype.h, utsname.h, dos.h, and go32.h. Ifdef away `disable' from dos.h, since breakpoint.h defines an enum member of the same name, and GCC 2.7.2 barfs. (_initialize_go32_nat): Provide new commands dos-sysinfo, dos-ldt, dos-gdt, and dos-idt, all of them in the "info" class --- gdb/ChangeLog | 11 + gdb/go32-nat.c | 748 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 758 insertions(+), 1 deletion(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 1f99bed295..ac621c7c7d 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,14 @@ +2001-07-08 Eli Zaretskii + + * go32-nat.c (go32_get_windows_version, print_mem, go32_sysinfo) + (read_memory_region, get_descriptor, display_descriptor) + (go32_sldt, go32_sgdt, go32_sidt): New functions. + (top-level): Include ctype.h, utsname.h, dos.h, and go32.h. Ifdef + away `disable' from dos.h, since breakpoint.h defines an enum + member of the same name, and GCC 2.7.2 barfs. + (_initialize_go32_nat): Provide new commands dos-sysinfo, dos-ldt, + dos-gdt, and dos-idt, all of them in the "info" class + 2001-07-07 Kevin Buettner * procfs.c (create_procinfo): Allocate space for saved_entryset diff --git a/gdb/go32-nat.c b/gdb/go32-nat.c index d7647e959e..94b8a84b2b 100644 --- a/gdb/go32-nat.c +++ b/gdb/go32-nat.c @@ -33,12 +33,19 @@ #include "regcache.h" #include "gdb_string.h" -#include /* required for __DJGPP_MINOR__ */ +#include /* might be required for __DJGPP_MINOR__ */ #include +#include #include #include +#include #include +/* breakpoint.h defines `disable' which is an enum member. */ +#define disable interrup_disable +#include +#undef disable #include +#include #include #include #if __DJGPP_MINOR__ > 2 @@ -878,11 +885,750 @@ init_go32_ops (void) processing_gcc_compilation = 2; } +unsigned short windows_major, windows_minor; + +/* Compute the version Windows reports via Int 2Fh/AX=1600h. */ +static void +go32_get_windows_version(void) +{ + __dpmi_regs r; + + r.x.ax = 0x1600; + __dpmi_int(0x2f, &r); + if (r.h.al > 2 && r.h.al != 0x80 && r.h.al != 0xff + && (r.h.al > 3 || r.h.ah > 0)) + { + windows_major = r.h.al; + windows_minor = r.h.ah; + } + else + windows_major = 0xff; /* meaning no Windows */ +} + +/* A subroutine of go32_sysinfo to display memory info. */ +static void +print_mem (unsigned long datum, const char *header, int in_pages_p) +{ + if (datum != 0xffffffffUL) + { + if (in_pages_p) + datum <<= 12; + puts_filtered (header); + if (datum > 1024) + { + printf_filtered ("%lu KB", datum >> 10); + if (datum > 1024 * 1024) + printf_filtered (" (%lu MB)", datum >> 20); + } + else + printf_filtered ("%lu Bytes", datum); + puts_filtered ("\n"); + } +} + +/* Display assorted information about the underlying OS. */ +static void +go32_sysinfo (char *arg, int from_tty) +{ + struct utsname u; + char cpuid_vendor[13]; + unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx; + unsigned true_dos_version = _get_dos_version (1); + unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor; + int dpmi_flags; + char dpmi_vendor_info[129]; + int dpmi_vendor_available = + __dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info); + __dpmi_version_ret dpmi_version_data; + long eflags; + __dpmi_free_mem_info mem_info; + __dpmi_regs regs; + + cpuid_vendor[0] = '\0'; + if (uname (&u)) + strcpy (u.machine, "Unknown x86"); + else if (u.machine[0] == 'i' && u.machine[1] > 4) + { + /* CPUID with EAX = 0 returns the Vendor ID. */ + __asm__ __volatile__ ("xorl %%ebx, %%ebx;" + "xorl %%ecx, %%ecx;" + "xorl %%edx, %%edx;" + "movl $0, %%eax;" + "cpuid;" + "movl %%ebx, %0;" + "movl %%edx, %1;" + "movl %%ecx, %2;" + "movl %%eax, %3;" + : "=m" (cpuid_vendor[0]), + "=m" (cpuid_vendor[4]), + "=m" (cpuid_vendor[8]), + "=m" (cpuid_max) + : + : "%eax", "%ebx", "%ecx", "%edx"); + cpuid_vendor[12] = '\0'; + } + + printf_filtered ("CPU Type.......................%s", u.machine); + if (cpuid_vendor[0]) + printf_filtered (" (%s)", cpuid_vendor); + puts_filtered ("\n"); + + /* CPUID with EAX = 1 returns processor signature and features. */ + if (cpuid_max >= 1) + { + static char *brand_name[] = { + "", + " Celeron", + " III", + " III Xeon", + "", "", "", "", + " 4" + }; + char cpu_string[80]; + char cpu_brand[20]; + unsigned brand_idx; + int intel_p = strcmp (cpuid_vendor, "GenuineIntel") == 0; + int amd_p = strcmp (cpuid_vendor, "AuthenticAMD") == 0; + unsigned cpu_family, cpu_model; + + __asm__ __volatile__ ("movl $1, %%eax;" + "cpuid;" + : "=a" (cpuid_eax), + "=b" (cpuid_ebx), + "=d" (cpuid_edx) + : + : "%ecx"); + brand_idx = cpuid_ebx & 0xff; + cpu_family = (cpuid_eax >> 8) & 0xf; + cpu_model = (cpuid_eax >> 4) & 0xf; + cpu_brand[0] = '\0'; + if (intel_p) + { + if (brand_idx > 0 + && brand_idx < sizeof(brand_name)/sizeof(brand_name[0]) + && *brand_name[brand_idx]) + strcpy (cpu_brand, brand_name[brand_idx]); + else if (cpu_family == 5) + { + if (((cpuid_eax >> 12) & 3) == 0 && cpu_model == 4) + strcpy (cpu_brand, " MMX"); + else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 1) + strcpy (cpu_brand, " OverDrive"); + else if (cpu_model > 1 && ((cpuid_eax >> 12) & 3) == 2) + strcpy (cpu_brand, " Dual"); + } + else if (cpu_family == 6 && cpu_model < 8) + { + switch (cpu_model) + { + case 1: + strcpy (cpu_brand, " Pro"); + break; + case 3: + strcpy (cpu_brand, " II"); + break; + case 5: + strcpy (cpu_brand, " II Xeon"); + break; + case 6: + strcpy (cpu_brand, " Celeron"); + break; + case 7: + strcpy (cpu_brand, " III"); + break; + } + } + } + else if (amd_p) + { + switch (cpu_family) + { + case 4: + strcpy (cpu_brand, "486/5x86"); + break; + case 5: + switch (cpu_model) + { + case 0: + case 1: + case 2: + case 3: + strcpy (cpu_brand, "-K5"); + break; + case 6: + case 7: + strcpy (cpu_brand, "-K6"); + break; + case 8: + strcpy (cpu_brand, "-K6-2"); + break; + case 9: + strcpy (cpu_brand, "-K6-III"); + break; + } + break; + case 6: + switch (cpu_model) + { + case 1: + case 2: + case 4: + strcpy (cpu_brand, " Athlon"); + break; + case 3: + strcpy (cpu_brand, " Duron"); + break; + } + break; + } + } + sprintf (cpu_string, "%s%s Model %d Stepping %d", + intel_p ? "Pentium" : (amd_p ? "AMD" : "ix86"), + cpu_brand, cpu_model, cpuid_eax & 0xf); + printfi_filtered (31, "%s\n", cpu_string); + if (((cpuid_edx & (6 | (0x0d << 23))) != 0) + || ((cpuid_edx & 1) == 0) + || (amd_p && (cpuid_edx & (3 << 30)) != 0)) + { + puts_filtered ("CPU Features..................."); + /* We only list features which might be useful in the DPMI + environment. */ + if ((cpuid_edx & 1) == 0) + puts_filtered ("No FPU "); /* it's unusual to not have an FPU */ + if ((cpuid_edx & (1 << 1)) != 0) + puts_filtered ("VME "); + if ((cpuid_edx & (1 << 2)) != 0) + puts_filtered ("DE "); + if ((cpuid_edx & (1 << 4)) != 0) + puts_filtered ("TSC "); + if ((cpuid_edx & (1 << 23)) != 0) + puts_filtered ("MMX "); + if ((cpuid_edx & (1 << 25)) != 0) + puts_filtered ("SSE "); + if ((cpuid_edx & (1 << 26)) != 0) + puts_filtered ("SSE2 "); + if (amd_p) + { + if ((cpuid_edx & (1 << 31)) != 0) + puts_filtered ("3DNow! "); + if ((cpuid_edx & (1 << 30)) != 0) + puts_filtered ("3DNow!Ext"); + } + puts_filtered ("\n"); + } + } + puts_filtered ("\n"); + printf_filtered ("DOS Version....................%s %s.%s", + _os_flavor, u.release, u.version); + if (true_dos_version != advertized_dos_version) + printf_filtered (" (disguised as v%d.%d)", _osmajor, _osminor); + puts_filtered ("\n"); + if (!windows_major) + go32_get_windows_version (); + if (windows_major != 0xff) + { + const char *windows_flavor; + + printf_filtered ("Windows Version................%d.%02d (Windows ", + windows_major, windows_minor); + switch (windows_major) + { + case 3: + windows_flavor = "3.X"; + break; + case 4: + switch (windows_minor) + { + case 0: + windows_flavor = "95, 95A, or 95B"; + break; + case 3: + windows_flavor = "95B OSR2.1 or 95C OSR2.5"; + break; + case 10: + windows_flavor = "98 or 98 SE"; + break; + case 90: + windows_flavor = "ME"; + break; + default: + windows_flavor = "9X"; + break; + } + break; + default: + windows_flavor = "??"; + break; + } + printf_filtered ("%s)\n", windows_flavor); + } + else if (true_dos_version == 0x532 && advertized_dos_version == 0x500) + printf_filtered ("Windows Version................Windows NT or Windows 2000\n"); + puts_filtered ("\n"); + if (dpmi_vendor_available == 0) + { + /* The DPMI spec says the vendor string should be ASCIIZ, but + I don't trust the vendors to follow that... */ + if (!memchr (&dpmi_vendor_info[2], 0, 126)) + dpmi_vendor_info[128] = '\0'; + printf_filtered ("DPMI Host......................%s v%d.%d (capabilities: %#x)\n", + &dpmi_vendor_info[2], + (unsigned)dpmi_vendor_info[0], + (unsigned)dpmi_vendor_info[1], + ((unsigned)dpmi_flags & 0x7f)); + } + __dpmi_get_version (&dpmi_version_data); + printf_filtered ("DPMI Version...................%d.%02d\n", + dpmi_version_data.major, dpmi_version_data.minor); + printf_filtered ("DPMI Info......................%s-bit DPMI, with%s Virtual Memory support\n", + (dpmi_version_data.flags & 1) ? "32" : "16", + (dpmi_version_data.flags & 4) ? "" : "out"); + printfi_filtered (31, "Interrupts reflected to %s mode\n", + (dpmi_version_data.flags & 2) ? "V86" : "Real"); + printfi_filtered (31, "Processor type: i%d86\n", + dpmi_version_data.cpu); + printfi_filtered (31, "PIC base interrupt: Master: %#x Slave: %#x\n", + dpmi_version_data.master_pic, dpmi_version_data.slave_pic); + + /* a_tss is only initialized when the debuggee is first run. */ + if (prog_has_started) + { + __asm__ __volatile__ ("pushfl ; popl %0" : "=g" (eflags)); + printf_filtered ("Protection.....................Ring %d (in %s), with%s I/O protection\n", + a_tss.tss_cs & 3, (a_tss.tss_cs & 4) ? "LDT" : "GDT", + (a_tss.tss_cs & 3) > ((eflags >> 12) & 3) ? "" : "out"); + } + puts_filtered ("\n"); + __dpmi_get_free_memory_information (&mem_info); + print_mem (mem_info.total_number_of_physical_pages, + "DPMI Total Physical Memory.....", 1); + print_mem (mem_info.total_number_of_free_pages, + "DPMI Free Physical Memory......", 1); + print_mem (mem_info.size_of_paging_file_partition_in_pages, + "DPMI Swap Space................", 1); + print_mem (mem_info.linear_address_space_size_in_pages, + "DPMI Total Linear Address Size.", 1); + print_mem (mem_info.free_linear_address_space_in_pages, + "DPMI Free Linear Address Size..", 1); + print_mem (mem_info.largest_available_free_block_in_bytes, + "DPMI Largest Free Memory Block.", 0); + + regs.h.ah = 0x48; + regs.x.bx = 0xffff; + __dpmi_int (0x21, ®s); + print_mem (regs.x.bx << 4, "Free DOS Memory................", 0); + regs.x.ax = 0x5800; + __dpmi_int (0x21, ®s); + if ((regs.x.flags & 1) == 0) + { + static const char *dos_hilo[] = { + "Low", "", "", "", "High", "", "", "", "High, then Low" + }; + static const char *dos_fit[] = { + "First", "Best", "Last" + }; + int hilo_idx = (regs.x.ax >> 4) & 0x0f; + int fit_idx = regs.x.ax & 0x0f; + + if (hilo_idx > 8) + hilo_idx = 0; + if (fit_idx > 2) + fit_idx = 0; + printf_filtered ("DOS Memory Allocation..........%s memory, %s fit\n", + dos_hilo[hilo_idx], dos_fit[fit_idx]); + regs.x.ax = 0x5802; + __dpmi_int (0x21, ®s); + if ((regs.x.flags & 1) != 0) + regs.h.al = 0; + printfi_filtered (31, "UMBs %sin DOS memory chain\n", + regs.h.al == 0 ? "not " : ""); + } +} + +struct seg_descr { + unsigned short limit0 __attribute__((packed)); + unsigned short base0 __attribute__((packed)); + unsigned char base1 __attribute__((packed)); + unsigned stype:5 __attribute__((packed)); + unsigned dpl:2 __attribute__((packed)); + unsigned present:1 __attribute__((packed)); + unsigned limit1:4 __attribute__((packed)); + unsigned available:1 __attribute__((packed)); + unsigned dummy:1 __attribute__((packed)); + unsigned bit32:1 __attribute__((packed)); + unsigned page_granular:1 __attribute__((packed)); + unsigned char base2 __attribute__((packed)); +}; + +struct gate_descr { + unsigned short offset0 __attribute__((packed)); + unsigned short selector __attribute__((packed)); + unsigned param_count:5 __attribute__((packed)); + unsigned dummy:3 __attribute__((packed)); + unsigned stype:5 __attribute__((packed)); + unsigned dpl:2 __attribute__((packed)); + unsigned present:1 __attribute__((packed)); + unsigned short offset1 __attribute__((packed)); +}; + +/* Read LEN bytes starting at logical address ADDR, and put the result + into DEST. Return 1 if success, zero if not. */ +static int +read_memory_region (unsigned long addr, void *dest, size_t len) +{ + unsigned long dos_ds_limit = __dpmi_get_segment_limit (_dos_ds); + + /* For the low memory, we can simply use _dos_ds. */ + if (addr <= dos_ds_limit - len) + dosmemget (addr, len, dest); + else + { + /* For memory above 1MB we need to set up a special segment to + be able to access that memory. */ + int sel = __dpmi_allocate_ldt_descriptors (1); + + if (sel <= 0 + || __dpmi_set_segment_base_address (sel, addr) == -1 + || __dpmi_set_segment_limit (sel, len - 1) == -1) + return 0; + movedata (sel, 0, _my_ds (), (unsigned)dest, len); + __dpmi_free_ldt_descriptor (sel); + } + return 1; +} + +/* Get a segment descriptor stored at index IDX in the descriptor + table whose base address is TABLE_BASE. Return the descriptor + type, or -1 if failure. */ +static int +get_descriptor (unsigned long table_base, int idx, void *descr) +{ + unsigned long addr = table_base + idx * 8; /* 8 bytes per entry */ + + if (read_memory_region (addr, descr, 8)) + return (int)((struct seg_descr *)descr)->stype; + return -1; +} + +struct dtr_reg { + unsigned short limit __attribute__((packed)); + unsigned long base __attribute__((packed)); +}; + +/* Display a segment descriptor stored at index IDX in a descriptor + table whose type is TYPE and whose base address is BASE_ADDR. If + FORCE is non-zero, display even invalid descriptors. */ +static void +display_descriptor (unsigned type, unsigned long base_addr, int idx, int force) +{ + struct seg_descr descr; + struct gate_descr gate; + + /* Get the descriptor from the table. */ + if (idx == 0 && type == 0) + puts_filtered ("0x000: null descriptor\n"); + else if (get_descriptor (base_addr, idx, &descr) != -1) + { + /* For each type of descriptor table, this has a bit set if the + corresponding type of selectors is valid in that table. */ + static unsigned allowed_descriptors[] = { + 0xffffdafeL, /* GDT */ + 0x0000c0e0L, /* IDT */ + 0xffffdafaL /* LDT */ + }; + + /* If the program hasn't started yet, assume the debuggee will + have the same CPL as the debugger. */ + int cpl = prog_has_started ? (a_tss.tss_cs & 3) : _my_cs () & 3; + unsigned long limit = (descr.limit1 << 16) | descr.limit0; + + if (descr.present + && (allowed_descriptors[type] & (1 << descr.stype)) != 0) + { + printf_filtered ("0x%03x: ", + type == 1 + ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); + if (descr.page_granular) + limit = (limit << 12) | 0xfff; /* big segment: low 12 bit set */ + if (descr.stype == 1 || descr.stype == 2 || descr.stype == 3 + || descr.stype == 9 || descr.stype == 11 + || (descr.stype >= 16 && descr.stype < 32)) + printf_filtered ("base=0x%02x%02x%04x limit=0x%08lx", + descr.base2, descr.base1, descr.base0, limit); + + switch (descr.stype) + { + case 1: + case 3: + printf_filtered (" 16-bit TSS (task %sactive)", + descr.stype == 3 ? "" : "in"); + break; + case 2: + puts_filtered (" LDT"); + break; + case 4: + memcpy (&gate, &descr, sizeof gate); + printf_filtered ("selector=0x%04x offs=0x%04x%04x", + gate.selector, gate.offset1, gate.offset0); + printf_filtered (" 16-bit Call Gate (params=%d)", + gate.param_count); + break; + case 5: + printf_filtered ("TSS selector=0x%04x", descr.base0); + printfi_filtered (16, "Task Gate"); + break; + case 6: + case 7: + memcpy (&gate, &descr, sizeof gate); + printf_filtered ("selector=0x%04x offs=0x%04x%04x", + gate.selector, gate.offset1, gate.offset0); + printf_filtered (" 16-bit %s Gate", + descr.stype == 6 ? "Interrupt" : "Trap"); + break; + case 9: + case 11: + printf_filtered (" 32-bit TSS (task %sactive)", + descr.stype == 3 ? "" : "in"); + break; + case 12: + memcpy (&gate, &descr, sizeof gate); + printf_filtered ("selector=0x%04x offs=0x%04x%04x", + gate.selector, gate.offset1, gate.offset0); + printf_filtered (" 32-bit Call Gate (params=%d)", + gate.param_count); + break; + case 14: + case 15: + memcpy (&gate, &descr, sizeof gate); + printf_filtered ("selector=0x%04x offs=0x%04x%04x", + gate.selector, gate.offset1, gate.offset0); + printf_filtered (" 32-bit %s Gate", + descr.stype == 14 ? "Interrupt" : "Trap"); + break; + case 16: /* data segments */ + case 17: + case 18: + case 19: + case 20: + case 21: + case 22: + case 23: + printf_filtered (" %s-bit Data (%s Exp-%s%s)", + descr.bit32 ? "32" : "16", + descr.stype & 2 ? "Read/Write," : "Read-Only, ", + descr.stype & 4 ? "down" : "up", + descr.stype & 1 ? "" : ", N.Acc"); + break; + case 24: /* code segments */ + case 25: + case 26: + case 27: + case 28: + case 29: + case 30: + case 31: + printf_filtered (" %s-bit Code (%s, %sConf%s)", + descr.bit32 ? "32" : "16", + descr.stype & 2 ? "Exec/Read" : "Exec-Only", + descr.stype & 4 ? "" : "N.", + descr.stype & 1 ? "" : ", N.Acc"); + break; + default: + printf_filtered ("Unknown type 0x%02x", descr.stype); + break; + } + puts_filtered ("\n"); + } + else if (force) + { + printf_filtered ("0x%03x: ", + type == 1 + ? idx : (idx * 8) | (type ? (cpl | 4) : 0)); + if (!descr.present) + puts_filtered ("Segment not present\n"); + else + printf_filtered ("Segment type 0x%02x is invalid in this table\n", + descr.stype); + } + } + else if (force) + printf_filtered ("0x%03x: Cannot read this descriptor\n", idx); +} + +static void +go32_sldt (char *arg, int from_tty) +{ + struct dtr_reg gdtr; + unsigned short ldtr = 0; + int ldt_idx; + struct seg_descr ldt_descr; + long ldt_entry = -1L; + int cpl = (prog_has_started ? a_tss.tss_cs : _my_cs ()) & 3; + + if (arg && *arg) + { + while (*arg && isspace(*arg)) + arg++; + + if (*arg) + { + ldt_entry = parse_and_eval_long (arg); + if (ldt_entry < 0 + || (ldt_entry & 4) == 0 + || (ldt_entry & 3) != (cpl & 3)) + error ("Invalid LDT entry 0x%03x.", ldt_entry); + } + } + + __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); + __asm__ __volatile__ ("sldt %0" : "=m" (ldtr) : /* no inputs */ ); + ldt_idx = ldtr / 8; + if (ldt_idx == 0) + puts_filtered ("There is no LDT.\n"); + /* LDT's entry in the GDT must have the type LDT, which is 2. */ + else if (get_descriptor (gdtr.base, ldt_idx, &ldt_descr) != 2) + printf_filtered ("LDT is present (at %#x), but unreadable by GDB.\n", + ldt_descr.base0 + | (ldt_descr.base1 << 16) + | (ldt_descr.base2 << 24)); + else + { + unsigned base = + ldt_descr.base0 + | (ldt_descr.base1 << 16) + | (ldt_descr.base2 << 24); + unsigned limit = ldt_descr.limit0 | (ldt_descr.limit1 << 16); + int max_entry; + + if (ldt_descr.page_granular) + /* Page-granular segments must have the low 12 bits of their + limit set. */ + limit = (limit << 12) | 0xfff; + /* LDT cannot have more than 8K 8-byte entries, i.e. more than + 64KB. */ + if (limit > 0xffff) + limit = 0xffff; + + max_entry = (limit + 1) / 8; + + if (ldt_entry >= 0) + { + if (ldt_entry > limit) + error ("Invalid LDT entry %#x: outside valid limits [0..%#x]", + ldt_entry, limit); + + display_descriptor (ldt_descr.stype, base, ldt_entry / 8, 1); + } + else + { + int i; + + for (i = 0; i < max_entry; i++) + display_descriptor (ldt_descr.stype, base, i, 0); + } + } +} + +static void +go32_sgdt (char *arg, int from_tty) +{ + struct dtr_reg gdtr; + long gdt_entry = -1L; + int max_entry; + + if (arg && *arg) + { + while (*arg && isspace(*arg)) + arg++; + + if (*arg) + { + gdt_entry = parse_and_eval_long (arg); + if (gdt_entry < 0 || (gdt_entry & 7) != 0) + error ("Invalid GDT entry 0x%03x: not an integral multiple of 8.", + gdt_entry); + } + } + + __asm__ __volatile__ ("sgdt %0" : "=m" (gdtr) : /* no inputs */ ); + max_entry = (gdtr.limit + 1) / 8; + + if (gdt_entry >= 0) + { + if (gdt_entry > gdtr.limit) + error ("Invalid GDT entry %#x: outside valid limits [0..%#x]", + gdt_entry, gdtr.limit); + + display_descriptor (0, gdtr.base, gdt_entry / 8, 1); + } + else + { + int i; + + for (i = 0; i < max_entry; i++) + display_descriptor (0, gdtr.base, i, 0); + } +} + +static void +go32_sidt (char *arg, int from_tty) +{ + struct dtr_reg idtr; + long idt_entry = -1L; + int max_entry; + + if (arg && *arg) + { + while (*arg && isspace(*arg)) + arg++; + + if (*arg) + { + idt_entry = parse_and_eval_long (arg); + if (idt_entry < 0) + error ("Invalid (negative) IDT entry 0x%03x.", idt_entry); + } + } + + __asm__ __volatile__ ("sidt %0" : "=m" (idtr) : /* no inputs */ ); + max_entry = (idtr.limit + 1) / 8; + if (max_entry > 0x100) /* no more than 256 entries */ + max_entry = 0x100; + + if (idt_entry >= 0) + { + if (idt_entry > idtr.limit) + error ("Invalid IDT entry %#x: outside valid limits [0..%#x]", + idt_entry, idtr.limit); + + display_descriptor (1, idtr.base, idt_entry, 1); + } + else + { + int i; + + for (i = 0; i < max_entry; i++) + display_descriptor (1, idtr.base, i, 0); + } +} + void _initialize_go32_nat (void) { init_go32_ops (); add_target (&go32_ops); + + add_info ("dos-sysinfo", go32_sysinfo, + "Display information about the target system, including CPU, OS, DPMI, etc."); + add_info ("dos-ldt", go32_sldt, + "Display entries in the LDT (Local Descriptor Table).\n" + "Entry number (an expression) as an argument means display only that entry."); + add_info ("dos-gdt", go32_sgdt, + "Display entries in the GDT (Global Descriptor Table).\n" + "Entry number (an expression) as an argument means display only that entry."); + add_info ("dos-idt", go32_sidt, + "Display entries in the IDT (Interrupt Descriptor Table).\n" + "Entry number (an expression) as an argument means display only that entry."); } pid_t -- 2.11.0