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Allocate a kernel stack for the process

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This commit is contained in:
Baptiste Wicht 2014-01-20 21:57:33 +01:00
parent 3796ff84e8
commit 4d153ef2be
1 changed files with 12 additions and 7 deletions
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19
kernel/src/shell.cpp
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@ -908,13 +908,18 @@ void exec_command(const std::vector<std::string>& params){
auto failed = allocate_segments(buffer, allocated_segments.get(), paging::PRESENT | paging::WRITE | paging::USER);
if(!failed){
auto stack_physical = allocate_user_stack(0x500000, paging::PAGE_SIZE * 2, paging::PRESENT | paging::WRITE | paging::USER);
constexpr const uint64_t user_rsp_start = 0x700000;
constexpr const uint64_t kernel_rsp_start = 0x800000;
if(stack_physical){
uint64_t rsp;
asm volatile("mov %0, rsp;" : "=m" (rsp));
gdt::tss.rsp0_low = rsp;
gdt::tss.rsp0_high = rsp >> 32;
constexpr const uint64_t user_rsp = user_rsp_start + (paging::PAGE_SIZE * 2 - 8);
constexpr const uint64_t kernel_rsp = kernel_rsp_start + (paging::PAGE_SIZE * 2 - 8);
auto user_stack_physical = allocate_user_stack(user_rsp_start, paging::PAGE_SIZE * 2, paging::PRESENT | paging::WRITE | paging::USER);
auto kernel_stack_physical = allocate_user_stack(kernel_rsp_start, paging::PAGE_SIZE * 2, paging::PRESENT | paging::WRITE | paging::USER);
if(user_stack_physical && kernel_stack_physical){
gdt::tss.rsp0_low = kernel_rsp;
gdt::tss.rsp0_high = kernel_rsp >> 32;
asm volatile("mov ax, %0; mov ds, ax; mov es, ax; mov fs, ax; mov gs, ax;"
: //No outputs
@ -923,7 +928,7 @@ void exec_command(const std::vector<std::string>& params){
asm volatile("push %0; push %1; pushfq; push %2; push %3; iretq"
: //No outputs
: "i" (gdt::USER_DATA_SELECTOR + 3), "i" (0x500000 + paging::PAGE_SIZE * 2 - 64), "i" (gdt::USER_CODE_SELECTOR + 3), "r" (header->e_entry)
: "i" (gdt::USER_DATA_SELECTOR + 3), "i" (user_rsp), "i" (gdt::USER_CODE_SELECTOR + 3), "r" (header->e_entry)
: "rax");
//TODO Release stack