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ed30037e48073a7d855fce58c1dfc563e446ff6c
xen/tools/debugger/libxendebug/xendebug.c
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kaf24@firebug.cl.cam.ac.uk ed30037e48 bitkeeper revision 1.1751 (42bbe480z9Fp_L5Tc500W8c8CL3g9A) 
Rationalise x86 CRn guest state into a ctrlreg array in the per-vcpu
context structure. Most noticeably this means the pt_base field has
gone away -- replaced by ctrlreg[3] (CR3). VCPU_guest_stts is also
gone -- it was never arch-independent anyway.
Signed-off-by: Keir Fraser <keir@xensource.com>
2005-06-24 10:46:24 +00:00

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C
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/*
* xendebug.c
*
* alex ho
* http://www.cl.cam.ac.uk/netos/pdb
*
* xendebug_memory_page adapted from xc_ptrace.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#include <xc.h>
#include "list.h"
#if defined(__i386__)
#define L1_PAGETABLE_SHIFT 12
#define L2_PAGETABLE_SHIFT 22
#elif defined(__x86_64__)
#define L1_PAGETABLE_SHIFT 12
#define L2_PAGETABLE_SHIFT 21
#define L3_PAGETABLE_SHIFT 30
#define L4_PAGETABLE_SHIFT 39
#endif
#define PAGE_SHIFT L1_PAGETABLE_SHIFT
#define PAGE_SIZE (1UL<<PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE - 1))
/* from xen/include/asm-x86/processor.h */
#define X86_EFLAGS_TF 0x00000100 /* Trap Flag */
typedef int boolean;
#define true 1
#define false 0
typedef struct bwcpoint /* break/watch/catch point */
{
struct list_head list;
memory_t address;
u32 domain;
u16 vcpu;
u8 old_value; /* old value for software bkpt */
} bwcpoint_t, *bwcpoint_p;
static bwcpoint_t bwcpoint_list;
typedef struct domain_context /* local cache of domain state */
{
struct list_head list;
u32 domid;
boolean valid[MAX_VIRT_CPUS];
vcpu_guest_context_t context[MAX_VIRT_CPUS];
long total_pages;
unsigned long *page_array;
unsigned long cr3_phys[MAX_VIRT_CPUS];
unsigned long *cr3_virt[MAX_VIRT_CPUS];
unsigned long pde_phys[MAX_VIRT_CPUS];
unsigned long *pde_virt[MAX_VIRT_CPUS];
unsigned long page_phys[MAX_VIRT_CPUS];
unsigned long *page_virt[MAX_VIRT_CPUS];
int page_perm[MAX_VIRT_CPUS];
} domain_context_t, *domain_context_p;
static domain_context_t domain_context_list;
/* initialization */
static boolean xendebug_initialized = false;
static __inline__ void
xendebug_initialize()
{
if ( !xendebug_initialized )
{
memset((void *) &domain_context_list, 0, sizeof(domain_context_t));
INIT_LIST_HEAD(&domain_context_list.list);
memset((void *) &bwcpoint_list, 0, sizeof(bwcpoint_t));
INIT_LIST_HEAD(&bwcpoint_list.list);
xendebug_initialized = true;
}
}
/**************/
static domain_context_p
xendebug_domain_context_search (u32 domid)
{
struct list_head *entry;
domain_context_p ctxt;
list_for_each(entry, &domain_context_list.list)
{
ctxt = list_entry(entry, domain_context_t, list);
if ( domid == ctxt->domid )
return ctxt;
}
return (domain_context_p)NULL;
}
static __inline__ domain_context_p
xendebug_get_context (int xc_handle, u32 domid, u32 vcpu)
{
int rc;
domain_context_p ctxt;
xendebug_initialize();
if ( (ctxt = xendebug_domain_context_search(domid)) == NULL)
return NULL;
if ( !ctxt->valid[vcpu] )
{
if ( (rc = xc_domain_get_vcpu_context(xc_handle, domid, vcpu,
&ctxt->context[vcpu])) )
return NULL;
ctxt->valid[vcpu] = true;
}
return ctxt;
}
static __inline__ int
xendebug_set_context (int xc_handle, domain_context_p ctxt, u32 vcpu)
{
dom0_op_t op;
int rc;
if ( !ctxt->valid[vcpu] )
return -EINVAL;
op.interface_version = DOM0_INTERFACE_VERSION;
op.cmd = DOM0_SETDOMAININFO;
op.u.setdomaininfo.domain = ctxt->domid;
op.u.setdomaininfo.vcpu = vcpu;
op.u.setdomaininfo.ctxt = &ctxt->context[vcpu];
if ( (rc = mlock(&ctxt->context[vcpu], sizeof(vcpu_guest_context_t))) )
return rc;
rc = xc_dom0_op(xc_handle, &op);
(void) munlock(&ctxt->context[vcpu], sizeof(vcpu_guest_context_t));
return rc;
}
/**************/
int
xendebug_attach(int xc_handle,
u32 domid,
u32 vcpu)
{
domain_context_p ctxt;
xendebug_initialize();
if ( (ctxt = malloc(sizeof(domain_context_t))) == NULL )
return -1;
memset(ctxt, 0, sizeof(domain_context_t));
ctxt->domid = domid;
list_add(&ctxt->list, &domain_context_list.list);
return xc_domain_pause(xc_handle, domid);
}
int
xendebug_detach(int xc_handle,
u32 domid,
u32 vcpu)
{
domain_context_p ctxt;
xendebug_initialize();
if ( (ctxt = xendebug_domain_context_search (domid)) == NULL)
return -EINVAL;
list_del(&ctxt->list);
if ( ctxt->page_array ) free(ctxt->page_array);
free(ctxt);
return xc_domain_unpause(xc_handle, domid);
}
int
xendebug_read_registers(int xc_handle,
u32 domid,
u32 vcpu,
cpu_user_regs_t **regs)
{
domain_context_p ctxt;
int rc = -1;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
if (ctxt)
{
*regs = &ctxt->context[vcpu].user_regs;
rc = 0;
}
return rc;
}
int
xendebug_read_fpregisters (int xc_handle,
u32 domid,
u32 vcpu,
char **regs)
{
domain_context_p ctxt;
int rc = -1;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
if (ctxt)
{
*regs = ctxt->context[vcpu].fpu_ctxt.x;
rc = 0;
}
return rc;
}
int
xendebug_write_registers(int xc_handle,
u32 domid,
u32 vcpu,
cpu_user_regs_t *regs)
{
domain_context_p ctxt;
int rc = -1;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
if (ctxt)
{
memcpy(&ctxt->context[vcpu].user_regs, regs, sizeof(cpu_user_regs_t));
rc = xendebug_set_context(xc_handle, ctxt, vcpu);
}
return rc;
}
int
xendebug_step(int xc_handle,
u32 domid,
u32 vcpu)
{
domain_context_p ctxt;
int rc;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
if (!ctxt) return -EINVAL;
ctxt->context[vcpu].user_regs.eflags |= X86_EFLAGS_TF;
if ( (rc = xendebug_set_context(xc_handle, ctxt, vcpu)) )
return rc;
ctxt->valid[vcpu] = false;
return xc_domain_unpause(xc_handle, domid);
}
int
xendebug_continue(int xc_handle,
u32 domid,
u32 vcpu)
{
domain_context_p ctxt;
int rc;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
if (!ctxt) return -EINVAL;
if ( ctxt->context[vcpu].user_regs.eflags & X86_EFLAGS_TF )
{
ctxt->context[vcpu].user_regs.eflags &= ~X86_EFLAGS_TF;
if ( (rc = xendebug_set_context(xc_handle, ctxt, vcpu)) )
return rc;
}
ctxt->valid[vcpu] = false;
return xc_domain_unpause(xc_handle, domid);
}
/*************************************************/
#define vtopdi(va) ((va) >> L2_PAGETABLE_SHIFT)
#define vtopti(va) (((va) >> PAGE_SHIFT) & 0x3ff)
/* access to one page */
static int
xendebug_memory_page (domain_context_p ctxt, int xc_handle, u32 vcpu,
int protection, memory_t address, int length, u8 *buffer)
{
vcpu_guest_context_t *vcpu_ctxt = &ctxt->context[vcpu];
unsigned long pde, page;
unsigned long va = (unsigned long)address;
void *ptr;
long pages;
pages = xc_get_tot_pages(xc_handle, ctxt->domid);
if ( ctxt->total_pages != pages )
{
if ( ctxt->total_pages > 0 ) free( ctxt->page_array );
ctxt->total_pages = pages;
ctxt->page_array = malloc(pages * sizeof(unsigned long));
if ( ctxt->page_array == NULL )
{
printf("Could not allocate memory\n");
return 0;
}
if ( xc_get_pfn_list(xc_handle, ctxt->domid, ctxt->page_array,pages) !=
pages )
{
printf("Could not get the page frame list\n");
return 0;
}
}
if ( vcpu_ctxt->ctrlreg[3] != ctxt->cr3_phys[vcpu])
{
ctxt->cr3_phys[vcpu] = vcpu_ctxt->ctrlreg[3];
if ( ctxt->cr3_virt[vcpu] )
munmap(ctxt->cr3_virt[vcpu], PAGE_SIZE);
ctxt->cr3_virt[vcpu] = xc_map_foreign_range(xc_handle, ctxt->domid,
PAGE_SIZE, PROT_READ, ctxt->cr3_phys[vcpu] >> PAGE_SHIFT);
if ( ctxt->cr3_virt[vcpu] == NULL )
return 0;
}
if ( (pde = ctxt->cr3_virt[vcpu][vtopdi(va)]) == 0) /* logical address */
return 0;
if (ctxt->context[vcpu].flags & VGCF_VMX_GUEST)
pde = ctxt->page_array[pde >> PAGE_SHIFT] << PAGE_SHIFT;
if (pde != ctxt->pde_phys[vcpu])
{
ctxt->pde_phys[vcpu] = pde;
if ( ctxt->pde_virt[vcpu])
munmap(ctxt->pde_virt[vcpu], PAGE_SIZE);
ctxt->pde_virt[vcpu] = xc_map_foreign_range(xc_handle, ctxt->domid,
PAGE_SIZE, PROT_READ, ctxt->pde_phys[vcpu] >> PAGE_SHIFT);
if ( ctxt->pde_virt[vcpu] == NULL )
return 0;
}
if ((page = ctxt->pde_virt[vcpu][vtopti(va)]) == 0) /* logical address */
return 0;
if (ctxt->context[vcpu].flags & VGCF_VMX_GUEST)
page = ctxt->page_array[page >> PAGE_SHIFT] << PAGE_SHIFT;
if (page != ctxt->page_phys[vcpu] || protection != ctxt->page_perm[vcpu])
{
ctxt->page_phys[vcpu] = page;
if (ctxt->page_virt[vcpu])
munmap(ctxt->page_virt[vcpu], PAGE_SIZE);
ctxt->page_virt[vcpu] = xc_map_foreign_range(xc_handle, ctxt->domid,
PAGE_SIZE, protection, ctxt->page_phys[vcpu] >> PAGE_SHIFT);
if ( ctxt->page_virt[vcpu] == NULL )
{
printf("cr3 %lx pde %lx page %lx pti %lx\n",
vcpu_ctxt->ctrlreg[3], pde, page, vtopti(va));
ctxt->page_phys[vcpu] = 0;
return 0;
}
ctxt->page_perm[vcpu] = protection;
}
ptr = (void *)( (unsigned long)ctxt->page_virt[vcpu] |
(va & ~PAGE_MASK) );
if ( protection & PROT_WRITE )
{
memcpy(ptr, buffer, length);
}
else
{
memcpy(buffer, ptr, length);
}
return length;
}
/* divide a memory operation into accesses to individual pages */
static int
xendebug_memory_op (domain_context_p ctxt, int xc_handle, u32 vcpu,
int protection, memory_t address, int length, u8 *buffer)
{
int remain; /* number of bytes to touch past this page */
int bytes = 0;
while ( (remain = (address + length - 1) - (address | (PAGE_SIZE-1))) > 0)
{
bytes += xendebug_memory_page(ctxt, xc_handle, vcpu, protection,
address, length - remain, buffer);
buffer += (length - remain);
length = remain;
address = (address | (PAGE_SIZE - 1)) + 1;
}
bytes += xendebug_memory_page(ctxt, xc_handle, vcpu, protection,
address, length, buffer);
return bytes;
}
int
xendebug_read_memory(int xc_handle,
u32 domid,
u32 vcpu,
memory_t address,
u32 length,
u8 *data)
{
domain_context_p ctxt;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
xendebug_memory_op(ctxt, xc_handle, vcpu, PROT_READ,
address, length, data);
return 0;
}
int
xendebug_write_memory(int xc_handle,
u32 domid,
u32 vcpu,
memory_t address,
u32 length,
u8 *data)
{
domain_context_p ctxt;
xendebug_initialize();
ctxt = xendebug_get_context(xc_handle, domid, vcpu);
xendebug_memory_op(ctxt, xc_handle, vcpu, PROT_READ | PROT_WRITE,
address, length, data);
return 0;
}
int
xendebug_insert_memory_breakpoint(int xc_handle,
u32 domid,
u32 vcpu,
memory_t address,
u32 length)
{
bwcpoint_p bkpt;
u8 breakpoint_opcode = 0xcc;
printf("insert breakpoint %d:%lx %d\n",
domid, address, length);
xendebug_initialize();
bkpt = malloc(sizeof(bwcpoint_t));
if ( bkpt == NULL )
{
printf("error: breakpoint length should be 1\n");
return -1;
}
if ( length != 1 )
{
printf("error: breakpoint length should be 1\n");
free(bkpt);
return -1;
}
bkpt->address = address;
bkpt->domain = domid;
xendebug_read_memory(xc_handle, domid, vcpu, address, 1,
&bkpt->old_value);
xendebug_write_memory(xc_handle, domid, vcpu, address, 1,
&breakpoint_opcode);
list_add(&bkpt->list, &bwcpoint_list.list);
printf("breakpoint_set %d:%lx 0x%x\n",
domid, address, bkpt->old_value);
return 0;
}
int
xendebug_remove_memory_breakpoint(int xc_handle,
u32 domid,
u32 vcpu,
memory_t address,
u32 length)
{
bwcpoint_p bkpt = NULL;
printf ("remove breakpoint %d:%lx\n",
domid, address);
struct list_head *entry;
list_for_each(entry, &bwcpoint_list.list)
{
bkpt = list_entry(entry, bwcpoint_t, list);
if ( domid == bkpt->domain && address == bkpt->address )
break;
}
if (bkpt == &bwcpoint_list || bkpt == NULL)
{
printf ("error: no breakpoint found\n");
return -1;
}
list_del(&bkpt->list);
xendebug_write_memory(xc_handle, domid, vcpu, address, 1,
&bkpt->old_value);
free(bkpt);
return 0;
}
int
xendebug_query_domain_stop(int xc_handle, int *dom_list, int dom_list_size)
{
xc_dominfo_t *info;
u32 first_dom = 0;
int max_doms = 1024;
int nr_doms, loop;
int count = 0;
if ( (info = malloc(max_doms * sizeof(xc_dominfo_t))) == NULL )
return -ENOMEM;
nr_doms = xc_domain_getinfo(xc_handle, first_dom, max_doms, info);
for (loop = 0; loop < nr_doms; loop++)
{
printf ("domid: %d", info[loop].domid);
printf (" %c%c%c%c%c%c",
info[loop].dying ? 'D' : '-',
info[loop].crashed ? 'C' : '-',
info[loop].shutdown ? 'S' : '-',
info[loop].paused ? 'P' : '-',
info[loop].blocked ? 'B' : '-',
info[loop].running ? 'R' : '-');
printf (" pages: %ld, vcpus %d",
info[loop].nr_pages, info[loop].vcpus);
printf ("\n");
if ( info[loop].paused && count < dom_list_size)
{
dom_list[count++] = info[loop].domid;
}
}
free(info);
return count;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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