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qemu-baremetal-cli-args

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QEMU part done https://github.com/cirosantilli/linux-kernel-module-cheat/issues/67
This commit is contained in:
Ciro Santilli 六四事件 法轮功
2020-04-02 01:00:00 +00:00
parent e25e79c26b
commit 637ef640bf
7 changed files with 161 additions and 70 deletions
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6
baremetal/lib/aarch64.S
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@@ -27,8 +27,10 @@ _start:
adr x0, lkmc_baremetal_on_exit_callback
bl on_exit
/* Run main. */
mov x0, 0
/* Setup CLI arguments and run main. */
ldr x0, =lkmc_argc
ldr x0, [x0]
ldr x1, =lkmc_argv
bl main
/* If main returns, exit. */

10
baremetal/link.ld
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@@ -14,15 +14,19 @@ SECTIONS
/* Fix the addresses of everything that comes after, no matter
* the exact size of the code present in .text. This allows us to
* place CLI arguments in memory at a known location! */
/* TODO would be better like this with --section-start=.lkmc_memory= on CLI,
* so that Python controls this value, but I can't that fucking working.
* baremetal_max_size from the Python must match this offset for now.
*/
/*. = SEGMENT_START(.lkmc_memory, .);*/
. = ADDR(.text) + 0x1000000;
lkmc_heap_low = .;
. = . + 0x1000000;
lkmc_heap_top = .;
. = . + 0x1000000;
lkmc_stack_top = .;
. = . + 0x1000000;
lkmc_argv = .;
. = . + 0x4;
lkmc_argc = .;
. = . + 0x4;
lkmc_argv = .;
}

6
baremetal/linker_variables.c
View File

@@ -10,7 +10,9 @@ extern int32_t lkmc_heap_low;
int main(int argc, char **argv) {
(void)argc;
(void)argv;
printf("&lkmc_heap_low %p\n", (void*)&lkmc_heap_low);
printf("&lkmc_argc %p\n", (void*)&lkmc_argc);
printf("&lkmc_heap_low %p\n", (void *)&lkmc_heap_low);
printf("&lkmc_argc %p\n", (void *)&lkmc_argc);
printf("argc %d\n", argc);
printf("argv %p\n", (void *)argv);
printf("lkmc_argc %" PRId32 "\n", lkmc_argc);
}