cca24d06d8
kernel (sys task). The main reason is that these would have to become cpu local variables on SMP. Once the system task is not a task but a genuine part of the kernel there is even less reason to have these extra variables as proc_ptr will already contain all neccessary information. In addition converting who_e to the process pointer and back again all the time will be avoided. Although proc_ptr will contain all important information, accessing it as a cpu local variable will be fairly expensive, hence the value would be assigned to some on stack local variable. Therefore it is better to add the 'caller' argument to the syscall handlers to pass the value on stack anyway. It also clearly denotes on who's behalf is the syscall being executed. This patch also ANSIfies the syscall function headers. Last but not least, it also fixes a potential bug in virtual_copy_f() in case the check is disabled. So far the function in case of a failure could possible reuse an old who_p in case this function had not been called from the system task. virtual_copy_f() takes the caller as a parameter too. In case the checking is disabled, the caller must be NULL and non NULL if it is enabled as we must be able to suspend the caller.
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/* The kernel call that is implemented in this file:
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* m_type: SYS_CPROFILE
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*
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* The parameters for this kernel call are:
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* m7_i1: PROF_ACTION (get/reset profiling data)
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* m7_i2: PROF_MEM_SIZE (available memory for data)
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* m7_i4: PROF_ENDPT (endpoint of caller)
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* m7_p1: PROF_CTL_PTR (location of info struct)
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* m7_p2: PROF_MEM_PTR (location of memory for data)
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*
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* Changes:
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* 14 Aug, 2006 Created (Rogier Meurs)
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*/
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#include "../system.h"
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#include <string.h>
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/*===========================================================================*
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* do_cprofile *
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*===========================================================================*/
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PUBLIC int do_cprofile(struct proc * caller, message * m_ptr)
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{
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int proc_nr, i;
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phys_bytes len;
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vir_bytes vir_dst;
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switch (m_ptr->PROF_ACTION) {
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case PROF_RESET:
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/* Reset profiling tables. */
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cprof_ctl_inst.reset = 1;
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kprintf("CPROFILE notice: resetting tables:");
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for (i=0; i<cprof_procs_no; i++) {
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kprintf(" %s", cprof_proc_info[i].name);
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/* Test whether proc still alive. */
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if (!isokendpt(cprof_proc_info[i].endpt, &proc_nr)) {
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kprintf("endpt not valid %u (%s)\n",
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cprof_proc_info[i].endpt, cprof_proc_info[i].name);
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continue;
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}
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/* Set reset flag. */
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data_copy(SYSTEM, (vir_bytes) &cprof_ctl_inst.reset,
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cprof_proc_info[i].endpt, cprof_proc_info[i].ctl_v,
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sizeof(cprof_ctl_inst.reset));
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}
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kprintf("\n");
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return OK;
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case PROF_GET:
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/* Get profiling data.
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*
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* Calculate physical addresses of user pointers. Copy to user
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* program the info struct. Copy to user program the profiling
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* tables of the profiled processes.
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*/
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if(!isokendpt(m_ptr->PROF_ENDPT, &proc_nr))
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return EINVAL;
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cprof_mem_size = m_ptr->PROF_MEM_SIZE;
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kprintf("CPROFILE notice: getting tables:");
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/* Copy control structs of profiled processes to calculate total
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* nr of bytes to be copied to user program and find out if any
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* errors happened. */
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cprof_info.mem_used = 0;
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cprof_info.err = 0;
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for (i=0; i<cprof_procs_no; i++) {
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kprintf(" %s", cprof_proc_info[i].name);
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/* Test whether proc still alive. */
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if (!isokendpt(cprof_proc_info[i].endpt, &proc_nr)) {
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kprintf("endpt not valid %u (%s)\n",
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cprof_proc_info[i].endpt, cprof_proc_info[i].name);
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continue;
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}
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/* Copy control struct from proc to local variable. */
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data_copy(cprof_proc_info[i].endpt, cprof_proc_info[i].ctl_v,
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SYSTEM, (vir_bytes) &cprof_ctl_inst,
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sizeof(cprof_ctl_inst));
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/* Calculate memory used. */
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cprof_proc_info[i].slots_used = cprof_ctl_inst.slots_used;
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cprof_info.mem_used += CPROF_PROCNAME_LEN;
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cprof_info.mem_used += sizeof(cprof_proc_info_inst.slots_used);
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cprof_info.mem_used += cprof_proc_info[i].slots_used *
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sizeof(cprof_tbl_inst);
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/* Collect errors. */
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cprof_info.err |= cprof_ctl_inst.err;
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}
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kprintf("\n");
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/* Do we have the space available? */
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if (cprof_mem_size < cprof_info.mem_used) cprof_info.mem_used = -1;
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/* Copy the info struct to the user process. */
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data_copy(SYSTEM, (vir_bytes) &cprof_info,
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m_ptr->PROF_ENDPT, (vir_bytes) m_ptr->PROF_CTL_PTR,
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sizeof(cprof_info));
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/* If there is no space or errors occurred, don't bother copying. */
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if (cprof_info.mem_used == -1 || cprof_info.err) return OK;
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/* For each profiled process, copy its name, slots_used and profiling
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* table to the user process. */
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vir_dst = (vir_bytes) m_ptr->PROF_MEM_PTR;
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for (i=0; i<cprof_procs_no; i++) {
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len = (phys_bytes) strlen(cprof_proc_info[i].name);
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data_copy(SYSTEM, (vir_bytes) cprof_proc_info[i].name,
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m_ptr->PROF_ENDPT, vir_dst, len);
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vir_dst += CPROF_PROCNAME_LEN;
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len = (phys_bytes) sizeof(cprof_ctl_inst.slots_used);
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data_copy(cprof_proc_info[i].endpt,
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cprof_proc_info[i].ctl_v + sizeof(cprof_ctl_inst.reset),
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m_ptr->PROF_ENDPT, vir_dst, len);
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vir_dst += len;
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len = (phys_bytes)
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(sizeof(cprof_tbl_inst) * cprof_proc_info[i].slots_used);
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data_copy(cprof_proc_info[i].endpt, cprof_proc_info[i].buf_v,
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m_ptr->PROF_ENDPT, vir_dst, len);
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vir_dst += len;
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}
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return OK;
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default:
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return EINVAL;
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}
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}
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