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.
202 lines
5.4 KiB
C
202 lines
5.4 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_GETINFO
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*
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* The parameters for this kernel call are:
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* m1_i3: I_REQUEST (what info to get)
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* m1_p1: I_VAL_PTR (where to put it)
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* m1_i1: I_VAL_LEN (maximum length expected, optional)
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* m1_p2: I_VAL_PTR2 (second, optional pointer)
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* m1_i2: I_VAL_LEN2_E (second length or process nr)
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*/
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#include <string.h>
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#include <minix/endpoint.h>
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#include "../system.h"
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#if USE_GETINFO
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/*===========================================================================*
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* do_getinfo *
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*===========================================================================*/
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PUBLIC int do_getinfo(struct proc * caller, message * m_ptr)
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{
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/* Request system information to be copied to caller's address space. This
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* call simply copies entire data structures to the caller.
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*/
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size_t length;
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vir_bytes src_vir;
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int nr_e, nr, r;
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int wipe_rnd_bin = -1;
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struct exec e_hdr;
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/* Set source address and length based on request type. */
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switch (m_ptr->I_REQUEST) {
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case GET_MACHINE: {
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length = sizeof(struct machine);
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src_vir = (vir_bytes) &machine;
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break;
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}
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case GET_KINFO: {
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length = sizeof(struct kinfo);
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src_vir = (vir_bytes) &kinfo;
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break;
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}
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case GET_LOADINFO: {
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length = sizeof(struct loadinfo);
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src_vir = (vir_bytes) &kloadinfo;
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break;
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}
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case GET_HZ: {
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length = sizeof(system_hz);
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src_vir = (vir_bytes) &system_hz;
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break;
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}
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case GET_IMAGE: {
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length = sizeof(struct boot_image) * NR_BOOT_PROCS;
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src_vir = (vir_bytes) image;
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break;
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}
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case GET_IRQHOOKS: {
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length = sizeof(struct irq_hook) * NR_IRQ_HOOKS;
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src_vir = (vir_bytes) irq_hooks;
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break;
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}
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case GET_PROCTAB: {
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length = sizeof(struct proc) * (NR_PROCS + NR_TASKS);
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src_vir = (vir_bytes) proc;
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break;
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}
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case GET_PRIVTAB: {
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length = sizeof(struct priv) * (NR_SYS_PROCS);
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src_vir = (vir_bytes) priv;
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break;
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}
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case GET_PROC: {
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nr_e = (m_ptr->I_VAL_LEN2_E == SELF) ?
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caller->p_endpoint : m_ptr->I_VAL_LEN2_E;
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if(!isokendpt(nr_e, &nr)) return EINVAL; /* validate request */
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length = sizeof(struct proc);
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src_vir = (vir_bytes) proc_addr(nr);
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break;
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}
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case GET_PRIV: {
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nr_e = (m_ptr->I_VAL_LEN2_E == SELF) ?
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caller->p_endpoint : m_ptr->I_VAL_LEN2_E;
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if(!isokendpt(nr_e, &nr)) return EINVAL; /* validate request */
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length = sizeof(struct priv);
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src_vir = (vir_bytes) priv_addr(nr_to_id(nr));
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break;
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}
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case GET_WHOAMI: {
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int len;
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/* GET_WHOAMI uses m3 and only uses the message contents for info. */
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m_ptr->GIWHO_EP = caller->p_endpoint;
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len = MIN(sizeof(m_ptr->GIWHO_NAME), sizeof(caller->p_name))-1;
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strncpy(m_ptr->GIWHO_NAME, caller->p_name, len);
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m_ptr->GIWHO_NAME[len] = '\0';
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return OK;
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}
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case GET_MONPARAMS: {
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src_vir = (vir_bytes) params_buffer;
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length = sizeof(params_buffer);
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break;
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}
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case GET_RANDOMNESS: {
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static struct k_randomness copy; /* copy to keep counters */
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int i;
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copy = krandom;
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for (i= 0; i<RANDOM_SOURCES; i++) {
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krandom.bin[i].r_size = 0; /* invalidate random data */
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krandom.bin[i].r_next = 0;
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}
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length = sizeof(copy);
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src_vir = (vir_bytes) ©
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break;
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}
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case GET_RANDOMNESS_BIN: {
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int bin = m_ptr->I_VAL_LEN2_E;
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if(bin < 0 || bin >= RANDOM_SOURCES) {
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kprintf("SYSTEM: GET_RANDOMNESS_BIN: %d out of range\n", bin);
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return EINVAL;
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}
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if(krandom.bin[bin].r_size < RANDOM_ELEMENTS)
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return ENOENT;
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length = sizeof(krandom.bin[bin]);
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src_vir = (vir_bytes) &krandom.bin[bin];
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wipe_rnd_bin = bin;
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break;
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}
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case GET_KMESSAGES: {
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length = sizeof(struct kmessages);
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src_vir = (vir_bytes) &kmess;
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break;
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}
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#if DEBUG_TIME_LOCKS
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case GET_LOCKTIMING: {
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length = sizeof(timingdata);
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src_vir = (vir_bytes) timingdata;
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break;
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}
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#endif
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case GET_IRQACTIDS: {
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length = sizeof(irq_actids);
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src_vir = (vir_bytes) irq_actids;
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break;
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}
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case GET_IDLETSC: {
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#ifdef CONFIG_IDLE_TSC
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length = sizeof(idle_tsc);
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src_vir = (vir_bytes) &idle_tsc;
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break;
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#else
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kprintf("do_getinfo: kernel not compiled with CONFIG_IDLE_TSC\n");
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return(EINVAL);
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#endif
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}
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case GET_AOUTHEADER: {
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int hdrindex, index = m_ptr->I_VAL_LEN2_E;
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if(index < 0 || index >= NR_BOOT_PROCS) {
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return EINVAL;
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}
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if (iskerneln(_ENDPOINT_P(image[index].endpoint))) {
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hdrindex = 0;
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} else {
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hdrindex = 1 + index-NR_TASKS;
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}
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arch_get_aout_headers(hdrindex, &e_hdr);
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length = sizeof(e_hdr);
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src_vir = (vir_bytes) &e_hdr;
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break;
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}
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default:
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kprintf("do_getinfo: invalid request %d\n", m_ptr->I_REQUEST);
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return(EINVAL);
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}
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/* Try to make the actual copy for the requested data. */
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if (m_ptr->I_VAL_LEN > 0 && length > m_ptr->I_VAL_LEN) return (E2BIG);
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r = data_copy_vmcheck(caller, SYSTEM, src_vir, caller->p_endpoint,
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(vir_bytes) m_ptr->I_VAL_PTR, length);
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if(r != OK) return r;
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if(wipe_rnd_bin >= 0 && wipe_rnd_bin < RANDOM_SOURCES) {
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krandom.bin[wipe_rnd_bin].r_size = 0;
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krandom.bin[wipe_rnd_bin].r_next = 0;
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}
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return(OK);
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}
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#endif /* USE_GETINFO */
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