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Add a check for NULL nlr_top in nlr_jump. 

If no nlr_buf has been pushed, and an nlr_jump is called, then control
is transferred to nlr_jump_fail (which should bail out with a fatal
error).
This commit is contained in:
Damien George 2014-04-08 14:08:14 +00:00
parent 094ebef259
commit 26cf55ae05
8 changed files with 53 additions and 16 deletions
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5
py/nlr.h
View File

@ -27,6 +27,11 @@ unsigned int nlr_push(nlr_buf_t *);
void nlr_pop(void);
void nlr_jump(void *val) __attribute__((noreturn));
// This must be implemented by a port. It's called by nlr_jump
// if no nlr buf has been pushed. It must not return, but rather
// should bail out with a fatal error.
void nlr_jump_fail(void *val);
// use nlr_raise instead of nlr_jump so that debugging is easier
#ifndef DEBUG
#define nlr_raise(val) nlr_jump(val)

2
py/nlrthumb.S
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@ -60,6 +60,8 @@ nlr_pop:
nlr_jump:
ldr r3, .L2 @ load addr of nlr_top
ldr r2, [r3] @ load nlr_top
cmp r2, #0 @ test if nlr_top is NULL
beq nlr_jump_fail @ if nlr_top is NULL, transfer control to nlr_jump_fail
str r0, [r2, #4] @ store return value
ldr r0, [r2] @ load prev nlr_buf
str r0, [r3] @ store prev nol_buf into nlr_top (to unlink list)

31
py/nlrx64.S
View File

@ -61,6 +61,8 @@ nlr_jump:
#endif
movq %rdi, %rax # put return value in %rax
movq nlr_top(%rip), %rdi # get nlr_top into %rdi
test %rdi, %rdi # check for nlr_top being NULL
je .fail # fail if nlr_top is NULL
movq %rax, 8(%rdi) # store return value
movq (%rdi), %rax # load prev nlr_buf
movq %rax, nlr_top(%rip) # store prev nlr_buf (to unlink list)
@ -76,10 +78,14 @@ nlr_jump:
xorq %rax, %rax # clear return register
inc %al # increase to make 1, non-local return
ret # return
.fail:
movq %rax, %rdi # put argument back in first-arg register
je nlr_jump_fail # transfer control to nlr_jump_fail
#if !(defined(__APPLE__) && defined(__MACH__))
.size nlr_jump, .-nlr_jump
#endif
.bss
#if !(defined(__APPLE__) && defined(__MACH__))
.local nlr_top
#endif
@ -107,12 +113,21 @@ nlr_push:
xorq %rax, %rax # return 0, normal return
ret # return
/* void nlr_jump(rcx=uint val) */
/* void nlr_pop() */
.globl nlr_pop
nlr_pop:
movq nlr_top(%rip), %rax # get nlr_top into %rax
movq (%rax), %rax # load prev nlr_buf
movq %rax, nlr_top(%rip) # store prev nlr_buf (to unlink list)
ret # return
/* void nlr_jump(rcx=uint val) */
.globl nlr_jump
nlr_jump:
movq %rcx, %rax # put return value in %rax
movq nlr_top(%rip), %rcx # get nlr_top into %rsi
movq nlr_top(%rip), %rcx # get nlr_top into %rcx
test %rcx, %rcx # check for nlr_top being NULL
je .fail # fail if nlr_top is NULL
movq %rax, 8(%rcx) # store return value
movq (%rcx), %rax # load prev nlr_buf
movq %rax, nlr_top(%rip) # store prev nlr_buf (to unlink list)
@ -130,17 +145,13 @@ nlr_jump:
xorq %rax, %rax # clear return register
inc %al # increase to make 1, non-local return
ret # return
.fail:
movq %rax, %rcx # put argument back in first-arg register
je nlr_jump_fail # transfer control to nlr_jump_fail
.bss
.comm nlr_top,8,8
/* void nlr_pop() */
.globl nlr_pop
nlr_pop:
movq nlr_top(%rip), %rax # get nlr_top into %rax
movq (%rax), %rax # load prev nlr_buf
movq %rax, nlr_top(%rip) # store prev nlr_buf (to unlink list)
ret # return
#endif // !defined(__CYGWIN__)
#endif // __x86_64__

3
py/nlrx86.S
View File

@ -60,6 +60,8 @@ _nlr_jump:
nlr_jump:
#endif
mov nlr_top, %edx # load nlr_top
test %edx, %edx # check for nlr_top being NULL
je nlr_jump_fail # fail if nlr_top is NULL
mov 4(%esp), %eax # load return value
mov %eax, 4(%edx) # store return value
mov (%edx), %eax # load prev nlr_top
@ -78,6 +80,7 @@ nlr_jump:
.size nlr_jump, .-nlr_jump
#endif
.bss
#ifndef _WIN32
.local nlr_top
#endif

5
stm/main.c
View File

@ -79,6 +79,11 @@ void __fatal_error(const char *msg) {
}
}
void nlr_jump_fail(void *val) {
printf("FATAL: uncaught exception %p\n", val);
__fatal_error("");
}
STATIC mp_obj_t pyb_config_source_dir = MP_OBJ_NULL;
STATIC mp_obj_t pyb_config_main = MP_OBJ_NULL;

5
stmhal/main.c
View File

@ -73,6 +73,11 @@ void __fatal_error(const char *msg) {
}
}
void nlr_jump_fail(void *val) {
printf("FATAL: uncaught exception %p\n", val);
__fatal_error("");
}
STATIC mp_obj_t pyb_config_source_dir = MP_OBJ_NULL;
STATIC mp_obj_t pyb_config_main = MP_OBJ_NULL;
STATIC mp_obj_t pyb_config_usb_mode = MP_OBJ_NULL;

12
unix-cpy/main.c
View File

@ -1,3 +1,4 @@
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
@ -74,12 +75,11 @@ int main(int argc, char **argv) {
return 0;
}
// for sqrt
#include <math.h>
machine_float_t machine_sqrt(machine_float_t x) {
return sqrt(x);
}
mp_import_stat_t mp_import_stat(const char *path) {
return MP_IMPORT_STAT_NO_EXIST;
}
void nlr_jump_fail(void *val) {
printf("FATAL: uncaught NLR %p\n", val);
exit(1);
}

6
unix/main.c
View File

@ -293,6 +293,7 @@ void pre_process_options(int argc, char **argv) {
}
int main(int argc, char **argv) {
nlr_jump(0);
volatile int stack_dummy;
stack_top = (void*)&stack_dummy;
@ -447,3 +448,8 @@ int DEBUG_printf(const char *fmt, ...) {
va_end(ap);
return ret;
}
void nlr_jump_fail(void *val) {
printf("FATAL: uncaught NLR %p\n", val);
exit(1);
}