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| author | Freya Murphy <freya@freyacat.org> | 2025-04-28 11:09:43 -0400 |
|---|---|---|
| committer | Freya Murphy <freya@freyacat.org> | 2025-04-28 11:09:43 -0400 |
| commit | 103e9e001036dce5cd34209b62a416fd1f34abbf (patch) | |
| tree | 4363f631c929f23b618c94f4d1a05ce51c4e6de8 /kernel/user.c | |
| parent | add stderr (diff) | |
| download | comus-103e9e001036dce5cd34209b62a416fd1f34abbf.tar.gz comus-103e9e001036dce5cd34209b62a416fd1f34abbf.tar.bz2 comus-103e9e001036dce5cd34209b62a416fd1f34abbf.zip | |
move context save area to pcb not in stack
Diffstat (limited to '')
| -rw-r--r-- | kernel/user.c | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/kernel/user.c b/kernel/user.c index 9d933e5..ce24b3e 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -16,6 +16,10 @@ #define BLOCK_SIZE (PAGE_SIZE * 1000) static uint8_t *load_buffer = NULL; +#define USER_CODE 0x18 +#define USER_DATA 0x20 +#define RING3 3 + static int user_load_segment(struct pcb *pcb, struct disk *disk, int idx) { Elf64_Phdr hdr; @@ -63,7 +67,7 @@ static int user_load_segment(struct pcb *pcb, struct disk *disk, int idx) kunmapaddr(mapADDR); return 1; } - memcpyv(mapADDR + total_read, load_buffer, read); + memcpy(mapADDR + total_read, load_buffer, read); total_read += read; } @@ -156,16 +160,28 @@ static int user_setup_stack(struct pcb *pcb) F_WRITEABLE | F_UNPRIVILEGED) == NULL) return 1; - // setup initial context save area - pcb->regs = (struct cpu_regs *)(USER_STACK_TOP - sizeof(struct cpu_regs)); - mem_ctx_switch(pcb->memctx); - memset(pcb->regs, 0, sizeof(struct cpu_regs)); - pcb->regs->rip = pcb->elf_header.e_entry; - pcb->regs->cs = 0x18 | 3; - pcb->regs->rflags = (1 << 9); - pcb->regs->rsp = USER_STACK_TOP; - pcb->regs->ss = 0x20 | 3; - mem_ctx_switch(kernel_mem_ctx); + memset(&pcb->regs, 0, sizeof(struct cpu_regs)); + + // pgdir + pcb->regs.cr3 = (uint64_t)mem_ctx_pgdir(pcb->memctx); + // segments + pcb->regs.gs = USER_DATA | RING3; + pcb->regs.fs = USER_DATA | RING3; + pcb->regs.es = USER_DATA | RING3; + pcb->regs.ds = USER_DATA | RING3; + // registers + pcb->regs.rdi = 0; // argc + pcb->regs.rsi = 0; // argv + // intruction pointer + pcb->regs.rip = pcb->elf_header.e_entry; + // code segment + pcb->regs.cs = 0x18 | 3; + // rflags + pcb->regs.rflags = (1 << 9); + // stack pointer + pcb->regs.rsp = USER_STACK_TOP; + // stack segment + pcb->regs.ss = 0x20 | 3; return 0; } @@ -176,8 +192,6 @@ int user_load(struct pcb *pcb, struct disk *disk) if (pcb == NULL || disk == NULL) return 1; - pcb->regs = NULL; - // allocate memory context pcb->memctx = mem_ctx_alloc(); if (pcb->memctx == NULL) |